The Ultimate Buyer's Guide for Purchasing Solar Street Light

Solar-powered street lights have become an increasingly popular solution for lighting public and private spaces without relying on traditional electricity. By harnessing the power of the sun, these innovative lights provide a reliable and eco-friendly alternative to conventional street lighting systems. Whether you're experienced with traditional street lights or you're a first-time buyer, you'll find our Solar Street Lights Buying Guide indispensable. We'll walk you through everything you need to know about solar LED street lights, from the different types available to the benefits they provide. We'll cover installation considerations, how to choose the best model for your needs, and compare outdoor solar street lights to traditional electric ones. By the end of this guide, you'll have a clear understanding of how LED solar lights can provide long-term savings and sustainability for your lighting projects.

Benefits of Solar Street Lights

Solar street lights offer a range of advantages that make them a practical and sustainable choice for lighting outdoor spaces. Below, we explore the benefits that set solar lights apart from traditional lighting systems.Energy EfficiencyOne of the standout benefits of solar streetlights is their remarkable energy efficiency. Unlike traditional street lights that rely on grid electricity, solar-powered street lights harness sunlight during the day and store it in batteries to power the lights at night. This self-sustaining system reduces the strain on energy grids and ensures no power is wasted. With advancements in solar panels and LED technology, today's solar street lights deliver bright, long-lasting illumination while consuming minimal energy.Low MaintenanceSolar streetlights are known for their low maintenance requirements. Since they don't rely on a complex wiring system or external power sources, there's no risk of electrical malfunctions or power outages. Additionally, most modern solar street lights are built with durable materials that withstand harsh weather conditions, requiring little more than periodic cleaning of the solar panels to ensure optimal performance.Environmental Benefits (Renewable Energy)Solar streetlights are a great option for anyone looking to minimize their environmental impact. Using renewable energy from the sun helps reduce greenhouse gas emissions and reliance on fossil fuels. Switching to solar-powered street lighting contributes to a cleaner, more sustainable planet, aligning with global efforts to promote green energy and reduce the carbon footprint of urban infrastructure.Cost Savings (Reduced Electricity Bills)While the initial investment in solar street lights may be higher than traditional lighting systems, the long-term savings are undeniable. Since solar street lights are powered entirely by sunlight, there are no ongoing electricity costs. Over time, this translates into substantial savings. Moreover, with fewer maintenance needs and longer lifespans, solar street lights offer a strong return on investment, making them a cost-effective solution for lighting large spaces.

Types of Solar-Powered Street Lights

There are three main types of solar-powered street lights, each with its own design, features, and benefits, making it suitable for select applications. Integrated Solar Street LightsIntegrated solar street lights combine the solar panel, LED light, and battery into a single compact unit, making them a sleek, space-saving option that's easy to install. This design is particularly beneficial for residential areas, parks, and smaller public spaces where minimal maintenance is desired. However, because the components are fixed within a single unit, there's less flexibility for upgrades or adjustments, which may limit their use in large-scale projects.Split Solar Street LightsSplit solar street lights offer more flexibility by separating the solar panel, light fixture, and battery. This design allows the solar panel to be positioned for maximum sunlight, even in shaded or complex environments. It's a great option for areas with variable landscapes or lighting needs. While the added flexibility is a big advantage, split solar street light installation can be more complex due to the separate components, and maintenance may require more attention than integrated systems.All-in-One Solar Street LightsAll-in-one solar street lights are designed for simplicity, with all components (solar panel, LED light, battery, and controller) housed within a single unit. Their quick and easy installation makes all-in-one solar street lights ideal for smaller to medium-sized outdoor spaces like residential streets or parking lots. However, their compact design may not provide sufficient power for larger areas, and if one component fails, the entire unit may need replacement.

How to Choose the Best Solar Street Lights

Selecting the right solar street light for your needs involves considering several important factors affecting performance and longevity. Here's a breakdown of the features to look for:

• Battery Life: The battery is a critical component of any solar street light, as it stores the energy collected during the day to power the light at night. Look for lights with long-lasting, high-capacity batteries, typically lithium-ion or lithium phosphate, which offer better efficiency and longer lifespans than older battery types. A good solar street light should provide at least 8 to 12 hours of illumination on a full charge. The battery's cycle life (how many times it can be charged and discharged) is also essential to ensure long-term reliability.
• Lumens (Brightness): The brightness of the light is measured in lumens, and choosing the right lumen level depends on the specific area you need to illuminate. Lower-lumen lights may be sufficient for smaller spaces like residential streets or pathways, while larger areas like parking lots or commercial zones require higher-lumen options. Generally, the higher the lumens, the brighter the light. Look for LED solar street lights that offer high efficiency in lumens per watt to ensure bright illumination without draining the battery quickly.
• Panel Quality: The quality of the solar panel is essential for ensuring that your solar street light can absorb enough sunlight to power the system effectively. Look for panels made from high-efficiency materials like monocrystalline or polycrystalline, which convert sunlight into energy more efficiently. The size and placement of the panel are also important factors — larger panels or those with better sun exposure can charge the battery faster, ensuring consistent performance even in less sunny conditions. 
• Warranties and Support: A good warranty is a sign of a reliable product, and it's something you should always look for when choosing a solar street light. Many reputable manufacturers offer warranties that cover both the solar panel and the LED light for several years, often from 3 to 5 years. Longer warranties provide peace of mind and protect your investment, ensuring you'll receive support if any component fails prematurely. Additionally, look for customer support options that can assist with troubleshooting or replacement parts, as this can save time and money in the long run.

Comparison of Solar and Traditional Street Lights

When deciding between solar street lights and traditional electric street lights, consider the long-term financial and environmental impacts of each option. Here's a breakdown of how they compare:Cost and InstallationDue to the inclusion of solar panels, batteries, and LED fixtures, the upfront cost of solar street lights can be higher than that of traditional street lights. However, traditional street lights require additional costs for trenching, wiring, and connection to the power grid, which can add significantly to installation expenses. Solar street lights, on the other hand, don't require any electrical infrastructure, making installation quicker and more cost-effective in areas without existing power lines.Energy SavingsThe biggest advantage of solar street lights is that they run entirely on renewable energy. Once installed, they don't incur ongoing electricity costs, resulting in significant savings over time. Traditional street lights, however, depend on electricity from the grid, contributing to higher operational costs. The energy savings from solar street lights make them a more sustainable choice in the long run.MaintenanceSolar street lights generally require less maintenance than traditional lights. With no wiring to inspect or bulbs to frequently replace, solar lighting systems operate for years with minimal upkeep. On the other hand, traditional street lights are subject to potential electrical issues, power outages, and regular bulb replacements, all of which can increase maintenance costs.Environmental ImpactSolar street lights are powered by renewable energy, significantly reducing their carbon footprint compared to traditional street lights, which rely on electricity generated from fossil fuels. Additionally, LED technology in solar street lights is more energy-efficient and lasts longer than traditional lighting solutions, further enhancing their environmental benefits.Lifespan and DurabilityModern solar street lights, particularly those with high-quality LED fixtures and durable batteries, are built to last for many years. They often have lifespans of 10 to 15 years for the solar panel and LED light and 5 to 7 years for the battery. Traditional street lights may require more frequent bulb and electrical component replacements, which can drive up long-term costs. However, solar street lights need proper battery maintenance and eventual replacement, which should be factored into overall longevity.You can learn more in our Solar Light Installation Case Study.

Battery and Charging Time

The performance of solar streetlights depends on the quality of their batteries and how efficiently they charge during daylight hours. Solar streetlights are equipped with high-capacity batteries that store energy from the sun throughout the day. This energy is then used to power the light during the night, with most batteries providing 8 to 12 hours of illumination on a full charge. Charging time varies depending on the solar panel's size and efficiency, along with the amount of sunlight the panel receives. In optimal conditions, the battery should be fully charged within 6 to 8 hours of direct sunlight. However, modern solar street lights are designed to operate efficiently even on cloudy days, ensuring consistent lighting performance throughout the night.

VIDEO: LED Parking Lot Mounts Explained

Which type of pole mount do you have – slip fit mount, arm mount, or yoke?

LED Light Expert Has the Best Solar Street Lights Under the Sun

Solar street lights are an innovative, eco-friendly, and cost-effective solution for illuminating outdoor spaces. Explore the options available at LED Light Expert to find the perfect solar street light solution for your project.

FAQs: Solar-Powered Street Lights

Below, we've answered some common questions concerning outdoor solar street lights. Please contact us for more information on this topic.What happens to solar street lights during a power outage?Since solar street lights operate independently from the power grid, they're unaffected by power outages. This makes them a reliable lighting solution in areas where electricity supply may be inconsistent or in emergency situations when grid power fails.Can solar street lights work during the winter months or in cloudy weather?Yes, solar street lights work even in less-than-ideal weather conditions. While direct sunlight will provide optimal charging, solar street lights can still generate power on cloudy days, though charging times may be longer. High-quality systems are equipped with efficient panels and batteries that store enough energy to keep the lights operational during overcast days or in winter months when daylight hours are shorter.What is the typical lifespan of a solar street light?The lifespan of a solar street light depends on its components. Most solar panels last 20-25 years, while LED lights can last around 10-15 years. The battery, which is crucial for storing energy, usually has a lifespan of 5-7 years, though regular maintenance and timely replacement ensures the entire system will continue to function properly.About the Author:  Dara Greaney is founder and CEO of LED Light Expert with deep expertise in LED fixtures and Light design.  LinkedIn or Twitter.  Editing by David Peguero.About us:  See our About us page for more about LED Light Expert.   FAQ Page for LED Solar Street Lights and Solar Flood Lights Buyers Guide

Are you looking for a solar-energy-based illuminating solution for either your own courtyards or some public sites, such as playgrounds, pathways, parking lots, plazas, etc?

If you want to learn more, please visit our website.

Or, you are upset about the short autonomy of your current solar street lights with traditional technology, which, sometimes, especially during monsoon, have to subsist on the national electricity grid?

(some hybrid solar street lights systems are grid-tied systems, they are designed to connect to the national electricity grid. When their own battery bank runs out of power, they will switch to the electricity grid.)

However, things can be worse.

Your projects could be located in some remote rural areas or isolated islands, where no electricity can reach. How can your solar-powered street lights survive a spell of raining weather?

You may say we should increase the size of both battery bank and solar panels. Well, this sounds plausible in engineering respect, but when it comes to the project budget, this also means the raising of outlay significantly since the cost of battery accounts for a larger part.

Then, why not adopt the ones with advanced technology, all in one solar street lights.

Advertisements

Without further ado, let’s dive right in:

Chapter 1. What are all-in-one solar street lights?

All-in-one solar street lights are one type of integrated solar street lights, which integrates into a product the four main components: solar panel, light source, battery, solar energy cables, and solar controller.

Now let’s go through the details of each module one by one

The 5 major modules

Module #1 Monocrystalline Solar Panel

Monocrystalline and polycrystalline solar panels are two different solar panels that are widely applied in the solar industry.

Generally speaking, monocrystalline performs better than polycrystalline, especially in cold weather they have higher energy conversion rates than polycrystalline. To data, Sunpower monocrystalline solar panels can reach as much as 24.1% conversion rates.

So, Monocrystalline panels are installed in all-in-one solar street lights due to their limited size.

These solar panels act as the role of energy collecting and conversion, in the daytime, they collect energy from the sun and then convert them into electric power which will be stored in batteries as chemical energy.

Module #2 LED Light source

Suffice it to say, as light sources LEDs are prevailing among illuminating market, for their high performance in energy-saving. It definitely can be counted as a new generation of lighting solutions.

LED types vary in size and watts, such as , , , , to adapt to different applications.

Our S2 series integrated solar street lights are with Philips LUXEON SMD, which has almost 190 lumens per watt. A LED module is formed by these single SMDs which are soldered to an aluminum substrate in advance.

Furthermore, an aluminum heatsink is always applied to the rear side of the led modules to help dissipate the heat generated by LEDs. This is very important, for although manufacturers claim that LED has a lifespan of more than 50,000 hours, its light depreciation can be abnormally high if it is working at a temperature larger than 70 Celsius. So we must make sure that the LED junction temperature is under 70 Celsius.

Module #3 Lithium-ion Battery

Rather than car batteries, which are designed to discharge a large amount of energy in a short period of time, renewable energy industries prefer deep-cycle batteries, for their excellent characteristics in the enduring power supply, deep discharges, and far more cycle times, times, twice or three times more than that of car batteries.

Batteries cycle times are also affected by the depth of discharge(DoD), we will talk more in Chapter 5.

There are two main types of deep-cycle batteries that existed in the solar battery market: lead-acid and lithium.

5 reasons why do all-in-one solar street lights use lithium-ion batteries?

1. Flooded lead-acid batteries require maintenance, say, equalization
2. Although sealed lead acid batteries are maintenance-free, they are pretty expensive than flooded ones
3. Both two types of lead-acid batteries occupy too much space to be set up in all-in-one solar street lights, which is compact design and with small spaces inside.
4. Lithium batteries have a longer lifespan than lead-acid batteries, six times the number of cycles compared to a lead-acid
5. Lithium is capable of surviving irregular discharging and is maintenance-free.

However, manufacturers often use two types of lithium-ion battery

• ternary lithium battery,
• lithium iron phosphate (LiFePO4) battery,

Difference between them?

What kind of lithium-ion battery should I use in my projects?

What we have learned, from the comparison table above, is that LiFePO4 battery is more expensive, but its chemical substance inside is more stable, which makes it kind of high-temperature resistance, while ternary lithium battery is relatively low-temperature resistance, for its materials are more active and can work under 0 Celsius.

So, if your project is in the tropics, a LiFePO4 battery is recommended. But if the project is in northern countries, we advise ternary lithium battery.

Module #4 MPPT Solar Charge Controller

There are 2 types of controllers: PWM and MPPT in the market.

All in one solar led street lights adopt MPPT, for, in this case, PWM will waste some energy collected by panels, while MPPT can convert all the solar energy collected into chemical energy

As the main functional component, MPPT solar charge controllers have some basic functions as below

1. Dusk to dawn control

The controller is always monitoring the voltage of the solar panel, which increases or decreases with the intensity of the sunlight. When it is lower than 5v, towards dusk, the control will switch on the LED lights. And when it is towards daybreak and the voltage is larger than 5v, the LED lights will be turned off.

2. Time control

The solar controller can also control the power output according to the time schedule, for instance, you want

• 70 percent brightness from 6:00 pm to 7:00 pm,
• 100 percent from 8:00pm to 10:00pm,
• 30 percent from 11:00 pm to 5:00 am.

Commonly, a controller has around 5 time-slots you can use to set according to different requirements of projects.

Time control is often used in conjunction with motion sensor control. For example, from 11:00 pm to 5:00 am, there are few people on the road, so you can set only 30% power during this period, meanwhile, only capitalizing on the motion sensor to raise power to 100% when a passer-by is detected.

By doing this, we can save a lot of energy to boost the duration of off-grid solar street lights and ramp up the days of autonomy.

3. Motion sensor control

A controller can take action when it receives a signal from the motion sensor to increase LED brightness when someone is in the sensor area, and then revert to the former level of brightness when it moves out of the area.

4. Preventing overcharge and Low voltage disconnect(LVD)

Either overcharge or over-discharge can dramatically reduce the lifespan of batteries, although batteries modules themselves have this sort of protection, solar charge controllers usually have the same function analogous to that of battery modules. But be rest assured, the two are not conflicting with each other, for they function in different dimensions.

Module #5 Infrared(PIR) Motion sensor

Infrared and microwave motion sensors are two popular types in all-in-one integrated solar street lights, the infrared motion sensor detects heat source movement, while microwave ones send microwave radar and receive the bounced signals to analyze the changes in bounced signals.

Our all-in-one solar street lights incorporate infrared types, which have a 120-degree working angle and can detect a squat cone space under the lights.

We do not prefer microwave ones, although they have a larger working angle, they are rather too sensitive and more likely to respond to some wrong movements, such as swaying trees, flapping birds, and fluttering flags. Those wrong responses could consume lots of gratuitous battery energy, and that’s what we do not expect.

Above is the introduction of the primary components.

However, as integrated solar street lights, all in one solar street lights can also integrate some other functioning modules, such as Bluetooth, CCTV(Closed Circuit TV), or even a wireless monitoring system, which enables end-users to monitor the status of each light or even to control every light by PC or mobile at any places where there are internet services.

Then, How do all these modules work as a complete system?

We will talk about the working process in 2 aspects:

Chapter 2. How does an all-in-one solar street light work?

#Charging

First, the solar charge controller will turn off LED lights towards dawn once solar panel voltage rise to 5v, which is accounted for a little sunlight in the morning.

When there is enough sunshine during the day, the solar panel will work together with the solar charge controller to collect the solar energy.

Commonly, in a 12v solar system, with the effect of insolation, the voltage of its solar panel will rise to around 18v so as to charge the 12v battery bank. Meanwhile, the solar charge controller will prevent overcharge to protect the batteries.

#Discharging

When there is not enough sunlight towards dusk and solar panel voltage drops to a value under 5v, the LEDs will be turned on accordingly.

“Time control mode” and “Motion sensor control mode” will be working during discharging at night.

As primary function, Time control is used to customize different brightness in different time slots. For example:

• Time slot 1: 6:00 pm – 7:00 pm, 50% brightness
• Time slot 2: 7:00 pm – 8:00 pm, 70% brightness
• Time slot 3: 8:00 pm – 10:00 pm, 100% brightness
• Time slot 4: 11:00 pm – 2:00 am, 50% brightness
• Time slot 5: 3:00 am – 5:00 am, 30% brightness

And so on.

a motion sensor is used as a minor function which can be recognized as an energy-saving mode

The LEDs’ brightness will rise to 100% when someone is approaching the lights and then revert to the previous level of brightness 20 seconds after the man leaves.

Chapter 3. Why should we use all-in-one solar street lights?

3 reasons why traditional solar street lights were not that popular?

In the past, why people do not tend to choose solar-powered street lights is due to three major reasons,

1. Lighting bulbs are energy-consuming

Both MH(metal halide) and HPS (high-pressure sodium), which were used as light sources in streetlights at that time, are with the relatively obsolete lighting technology (60-80 lumens/w) compared with that of the LED. those bulbs/lamps usually require a large amount of energy per day from its battery bank, which is considered as a downright burden to its battery capacity.

2. The LED technology is newly developed and pretty expensive

In those days, although LEDs had been on the market in commercial outdoor lighting for a few years, the technology was still not mature. Their lighting efficiency was only 100 lumens/watt (now, in , it can be up to 200 lumens/watt). Furthermore, since LEDs were newly developed at that time, the cost was rather expensive and the average man on the street could not afford to buy.

3. Lithium-ion battery technology is not well developed

The third reason is the solar battery. The lithium-ion battery has the longest lifespan as one kind of deep cycle battery, but they were not stable and would fail to work under 0 Celsius. (now, the working temperature of ternary lithium battery: -30 to 65 Celsius)

However, Things have changed over years.

New technologies are applied to solar street lights?

The size of both batteries and lighting sources is increasingly small nowadays.

Thanks for the technological breakthrough in both the lithium-ion battery and LED lighting. These developments make it possible for the solar lighting industry to develop integrated solar street lights.

1. Battery

Compared with lead-acid batteries, lithium batteries are lighter, smaller, with a longer lifespan and larger DoD, what is more important is that lithium batteries are with larger capacity at the same volume.

2. Light source

Compared with MH/HPS bulbs, LED takes up far less space in the lamps

What can we benefit from the latest technology?

1. No wiring, and easy to install within a few minutes

there is no complex wiring process, even if you are the end-users, you do not have to be with an engineering background or skills of setting electrical equipment, all you need to do is fixing the product with 12 pieces of fastening screws. Your family will stand to benefit from the free solar energy all the time.

2. 60% less energy consumption, which also means more days of autonomy

The light sources of most conventional solar street lights were Metal Halide(MH) or High-Pressure Sodium(HPS), which luminous efficacy is only 60-80 lumens per watt. However, nowadays, the cutting-edge LED lighting technology has dramatically boosted it up to about 200 lumens per watt. People can get the same brightness at night by consuming much less energy from solar batteries.

All in one solar street lights with this kind of light source easily realize 5+ days autonomy, making it possible to work normally in places with rainy seasons or less insolation.

3. Better hurricane/typhoon resistance ability

All in one integrated solar street lights are designed with compact structure, compared with that of split-types, which solar panel are separated from the lamp. This kind of structure has better performance in withstanding hurricanes/typhoons.

Split-type solar street light will not withstand such inclement weather since its separated solar panels are more likely to be shredded by storms.

4. Lower transportation cost benefits from compact structure and all-in-one design

If you are a businessman, compact design means a lot to your profit margin.

The whole container loads of solar street lights could be twice or even three times more than before, in the meantime, the rent of the warehouse can cost much less than before.

Besides, due to the convenience of installation, which we talked in #1, your company will save even more local labor costs.

And more…

Chapter 4. All in one solar street lights VS. Traditional solar street lights

In this chapter, we will go through a concrete example by presenting a comparison table between them, so you can figure out the pros and cons more easily.

the same brightness, working hours, and days of autonomy,

But it is obvious, the upfront cost of all in one solar led street lights is fairly low,

it only needs a 27Ah battery and 50 watts solar panel, whereas traditional solar street lights require 156 Ah and 280 watts, let alone other extra wiring costs that are entailed in installation.

Chapter 5. How to get a qualified all in one solar street lights?

needless to say, the quality of products is very important to businesses, sometimes, is crucial for winning tenders.

But can you always get a qualified all in one solar street light? I doubt it.

You might encounter problems:

• even if you have been in this business for years, but you still have no idea about what exactly standards for an eligible product?
• you might have learned the standards, but how to achieve? What factors affect the quality?

Let’s dive in the content with these questions you may have.

6 major factors QC mainly focuses on, for almost all kinds of integrated solar street lights:

1. CCT & CRI
2. LM80 standard
3. Battery cycle times
4. 3 transportation testing for lithium batteries
5. Ingress Protection standard
6. Working temperature

Let’s review each one in detail.

1. CCT & CRI

CCT & CRI are important optical factors for illuminating

CCT stands for correlated color temperature.  lower value tends to yellow, while larger value tends to white and even with a little blueish color, refer to K in the picture.

K looks like the sunlight at dusk or daybreak, the sunlight at noon is around K, K is called natural white, compact fluorescent lamp commonly has -K.

Link to Hongzhun

Nowadays, nature white(-K) is always using in solar street lights.

Color rendering index (CRI) indicates how well a light source allows the substance to reflect its real color, the higher the CRI, the more an object can reflect its real color under this light source. Refer to the CRI 80 VS CRI 90

However, larger CRI also means more brightness loss as compensation. Namely, when we use the same chips to produce LED, if we make it with higher CRI, its brightness will be relatively dimmer than the one with lower CRI, so we commonly apply CRI 70 to the solar street light industry to get somewhat equilibrium.

Method

With the help of the integrating sphere, we can easily get the two optical parameters when inspecting the incoming raw materials. In fact, integrating sphere can also help to get even more electrical parameters, such as illuminance(brightness), lighting efficacy and so on.

2. LM80 Standard

LM80 is related to the lumen maintenance of LED, this standard requires the LED to meet the following table

Since human eyes will not perceive the depreciation until it drops to 30%, an LM80 certified LED can definitely walk you through 50, 000 hours without becoming dim sensorily

Method

Some types of equipment are specially designed to do this test accordingly, although it is very expensive.

If you do not want to invest such huge and expensive facilities, our advice is to complete the job in a third party laboratory with little payment.

3. Battery cycle time

Battery seems to be the most vulnerable part, they have the higher failure rates than the others, its lifespan depends on not only the materials and workmanship but also how we use it, for examples, how many proportions of power is discharged before next charging, specifically, the depth of discharge (DoD)

In solar street lights systems, the larger proportion the batteries are discharged every day, the shorter its cycle times will be.

Batteries manufacturers declare the cycle times of their lithium battery to be – times, which is based on the scenario that the battery is almost fully discharged each time.

However, we need to verify this data by ourselves so as to be responsible for the quality

Method

Use an instrument like this one can help to record the testing data automatically, some of them have UPS(Uninterrupted Power Supply) function to guarantee a complete testing process and the data integrity.

4. UN38.3 transportation testing for lithium batteries

UN38.3 is for the safety of transportation of batteries or products with batteries, it includes 8 test items

1. Altitude Simulation
2. Thermal Test
3. Vibration
4. Shock
5. External Short Circuit
6. Impact
7. Overcharge
8. Forced Discharge

Over those procedures, UN38.8 requires there is no leakage, no venting, no disassembly, no rupture, and no fire.

These are more extreme test conditions compared with normal working conditions, products which have passed UN38.3 are definitely able to perform better.

Detailed reports?

You can check the PDF file to see how we test our products according to UN38.3 directives

5. Ingress Protection standard

All in one integrated solar street lights are outdoor lighting, so they have to withstand a hostile environment where they may fail to work because of dust or rainfall.

Ingress Protection(IP) rating is used to define the grades of resistance against dust and water.

Outdoor lighting fixtures are usually with an IP65 rating, which is the highest protection level for outdoor luminaire except for underwater luminaire. The first digit 6 is for dust and the second digit 5 is for water.

Though there is waterproof seals set between the enclosure over the final assembly, those interior components themselves are watertight too. For instance, the wiring connectors are all waterproof, and the controller is IP67 rating.

Method

Apparently, referring to the picture above, a mimic raining environment is necessary for final testing, and it is more useful during the stage of design or pilot production.

If you do not have a spacious site for this kind of voluminous facility, we also suggest seeking a third party laboratory to help you with this work.

6. Working temperature

Outdoor temperature varies with location or season, the working temperature will directly affect the performance of each component or even lifespan in some extreme situations.

So either respective modules or assembled products needs testing and monitoring.

Engineering and QC take in charge of these jobs in a factory, when:

• new product design,
• pilot production,
• raw material changes,

As with others, these processes also rely on special tools.

Method

The equipment is used to imitate various working environments to test the tolerance of electronic products. The technician can also set worse working temperature than a real condition to check whether the electronic modules could survive from the testing.

Chapter 6. All in one solar street lights applications

The regions with sufficient sunshine is a must for a solar-powered facility to work normally.  The same principle applies to all in one solar street lights. Furthermore, as an off-grid solar-powered product, all in one integrated solar street lights can be used in remote areas where there is devoid of the infrastructure of the power station, such as islands, famous mountains surmounted by beauty spots, or some countryside.

However, as lighting products, all in one integrated solar street lights are mainly installed in the outdoor sites where illumination is required at night.

These sites are generally classified into four different areas as below:

1. Roadways

Fixtures: roadway lighting, street lighting

Locations: highway, road, motorway, lane,

Roadways represent a variety of ways for vehicle traffic. These ways require narrow beam angle across the road and wide beam angle along the road, for this can increase pole spacings and reduce the numbers of streetlights on it.

Recommend light distribution types:

Type II, Type III

2. Open Areas

Fixtures: parking lot lighting, park lighting, playground lighting, airport lighting, outdoor security lighting(sometimes with cameras)

Locations: airport, park, garden, parking lot, playground, tennis court, outdoor basketball court, intersections

Open Areas often connect vehicle traffic to pedestrian traffic, including the locations with public activities, such as the park, garden, and the places where security monitoring is always processing, such as parking lot, intersections.

these areas need illumination solution at night for either human activities or the scrutiny of the safety and security.

Recommend light distribution types:

Type II, Type III, Type V,

3. Pedestrian Areas

Fixtures: pathway lighting

Locations: plazas, courtyards, and pathways

Pedestrian areas indicate the transition between the building and its surrounding sites since these transition areas cover irregularly shaped spaces, more lighting distribution types may require for this kind of projects.

Recommend light distribution types:

Type II, Type III, Type IV, Type V,

4. Site Perimeter

Fixtures: Perimeter lighting, site lighting,

Locations: factory perimeter, industrial zone perimeter

Some sites, for instance, your villa, require illumination around its perimeter and exclude illumination onto the site itself, for at night you do not expect the street light trespass on your private space, especially bedroom.

Recommend light distribution types:

Type II, Type III, Type IV,

In the MH/HPS ages, this kind of lighting bulbs have to rely on reflector cup to shape special light distribution types on the ground, those cups usually installed above the bulbs, this is another reason why old street lights are too big to be integrated.

Whereas in LED ages, engineers only need to have a thin lens installed onto the LED to realize various light distribution types.

Chapter 7. how to design a project with all in one solar street lights(Case study)

Here is a real-life inquiry from Oman.

Since there is a lack of detailed information for designing a project, so we ask for more information, and the customer sends them in attachments

We spent some time to study and organize the information from the emails

At last, the customer’s requirements are listed below

1. 100w rated wattage, all in one solar led street lights for a roadway project
2. The road is 12-meter width
3. Mounting height 10 meters
4. minimum required illumination level at the ground: 5 lux
5. 12 hours/day, full power operation
6. 5 days of autonomy
7. materials are suitable for continuous 55 Celsius (the testing method is in Chapter 5)
8. IP65 waterproof.

The engineering process started firstly from checking the existed IES files to guarantee the 5 lux optical requirement on the ground

let’s go through the steps one by one

Step 1: check IES datasheet

Our 100w happens to be tested at the mounting height 10 m ( MH = 10 m), and it central illuminance can reach around 8 lux,

(tips: if the mounting height is 7 meters in your project, you need to multiply factor 2.041 in the right column to get relevant lux data on the ground)

Step 2: adjust the distance between the poles

In the course of simulation of engineering, IES files and Dialux can help engineers to get appropriate pole distance pretty easily.

process?

1. load the 100w IES file into software Dialux
2. Set the pole position: both sides or only one side?. (in this case, only one side installation is allowed)
3. Input basic parameters: road width, mounting height, preliminary pole distance, and the number of lamps per pole.
4. Try a different value of pole distance on the basis of using minimum streetlights, until you get “minimum 5 lux on the ground”

In the end, we decide 25 meters is the best pole distance. And at this time, the minimum illuminance is about 7 lux.

Step 3. Calculate the battery size

So far, optical parameters and installation positions have all been determined.

Next, we need to size the solar battery according to requirements, 12 hours/day and 5 days backup

1. The LED modules in this 100w model require working current 1.34A.
2. 12 hours full power operation consumes battery power 1.34A x 12H = 16.08AH
3. for 5 days backup, we need (16.08AH x 5 = 80.4 AH)
4. So we select an existed battery size: 84AH for this model.

Step 4. Calculate the solar panel size

The final step is to size the solar panel according to battery size 84AH and the peak sun hours

1. The solar irradiance in Sultanate of Oman is sufficient, its peak sun hours is about 6.5 hours
2. 84AH / 6.5 = 12.92 A, so we need 12.92A current from solar panel for 6.5 hours
3. For LifePO4 lithium battery, the charging voltage is 18v
4. 18V x 12.92A = 232.62 W, that means we need about 230 w energy from solar panel per day theoretically
5.  Since the battery is not always totally empty, so we usually multiply a coefficient, 0.7
6. 232.62 W x 0.7 = 162.84 W

Our 100w model is equipped with a 170w monocrystalline solar panel.

So, finally, we prepare the products with recommended parameters as below

• 170W monocrystalline solar panel
• 84AH LifePO4 lithium battery
• 100w rated LED model
• 10 000 lumen
• IP65

check here to check the datasheet in detail.

Conclusion

All-in-one solar street lights are a new trendy type of solar street lights, And this trend will be strengthened as the development of sodium-ion batteries, which are even powerful than current lithium-ion batteries.

Although it may take some time for sodium-ion batteries to go out from the laboratory to real-world applications, it is worth expecting. And at that time, solar street lights will be powerful enough to replace all streetlights.

Interested in estimating your potential projects with the help of our experts?

Or,

plan to replace traditional solar street lights with our all-in-one integrated solar street lights?

Or,

you do not want to miss out on the benefits to illuminate your own factory zone, and even courtyards or backyards?

Feel free to contact us with your detailed requirements. (as detailed as possible)

SOURCE

About Author

Related