Questions You Should Know about B Grade Solar Panel

(1) Look at the surface

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Carefully check the tempered glass surface, the products of small manufacturers are relatively rough, and the residual silica gel on the surface will reduce the power generation efficiency of the panel.

(2) Look at the battery sheets

Check the cells for edge chipping and cracks. There are many informal manufacturers who use broken battery sheets to splice together. This method has great risks and hidden dangers, which will affect the safe use of the entire battery board.

(3) Look at the back

Look at the quality of the pressure on the back. If there is unevenness after pressure bearing, such as bubbles, wrinkles, etc., it is regarded as a relatively low-quality product.

(4) Look at the frame

Is it straight. Due to the low barriers to entry in the solar panel industry, many small manufacturers use manual framing, the shape is not strictly rectangular, and the firmness is greatly reduced.

(5) Look at the silica gel

See if the silica gel is evenly distributed around the back, and whether it is tightly infiltrated into the gap between the backplane and the frame.

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(6) Look at welding

Carefully observe whether there is any missing welding in the string welding of the cells. At the same time, it is also necessary to check whether the arrangement of the cells is regular.

(7) Look at the junction box
Finally, check whether the junction box is firm, whether the junction box cover can be firmly and tightly attached to the junction box, and whether the outlet wire lock can rotate freely and can be tightened.

Whether you buy from authorized distributors of regular big brand manufacturers, and check and check the quality assurance contract, invoice, etc. These determine whether you can purchase A-level modules and enjoy after-sales service and subsequent 25-year quality assurance services .

With the rise of photovoltaic power generation, many module factories have also been added to the market. Some module factories will have strict factory inspections during the production of photovoltaic modules, and divide the modules into A, B, C, and D grades according to their performance and appearance. And some small component factories just follow the trend, buy old cells, and then process them and sell them. For friends who are new to the industry, it is easy to buy these B-level and C-level components, and they will be broken within a few years. Class A modules have excellent performance and a service life of at least 25 years. Generally speaking, only A-level modules can be marketed openly and aboveboard.

So what are the A, B, and C-level components generally used for?

A-level components: mainly used in ground power stations, distributed power stations, household systems, etc., with a life span of more than 25 years.

Class B components: mainly used for street lamps, off-grid systems, battery cars, etc., with a 5-year lifespan. Such components are Class A degraded components or produced with Class B materials.

Type C modules: mainly used in areas with underdeveloped electricity consumption, such as remote areas, Afghanistan, the Middle East, South Africa, etc., and the service life is unknown.

Therefore, when choosing photovoltaic power plant components, you should not ignore the quality of the components for the sake of saving costs. If you have any questions, please feel free to contact us.

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So I'm shopping for approx 5KW of PV for an off-grid home we're building, looking for panels in the 460-530w range. I found a local seller who has a variety of "B-grade" Heliene panels which he says are unused, straight from the factory but have cosmetic blemishes and no factory warranty.

He's local and I can pick them up myself which is appealing, and his price is very reasonable, but I'm leery of the no warranty. This is going to be our primary power source for this off-grid house.

Does anyone have any first-hand, long term experience with new Grade B modules? Are they reliable and do they actually produce to spec? What price per watt?

There are also used and new excess deals. The used in particular will be more like half the size you're considering, but that does make them easier to manhandle.

You want a brand known or durability.
If the price is right, warranty becomes even less important. Anyone living in hot climates, like Arizona, need to seriously consider the Power Temperature Coefficient of the panels they buy.
Most installers don't know this, but the really good panels will have a Temperature Coefficients of Power of -0.24.
A temp. coef. of Pwr of -0.29 is good and -0.34 is acceptable.

I've seen panels with a Temp Coef. of Pwr of -0.44, which is really poor.
During Arizona summers, these panels produce about 55% of the rated power and on 115-degree days they produce about 36% of their rated power.