List Price: $129.95
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the UPG Solar panel is very good quality and most of all it works flawlessly its a fast charger. I would recommend the sun-force charge controller for protection.
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Good energy producers for my solar lighting projects but the frame seems kind of weak. I reinforced the framework due to the fact that the number one failure with solar panels is the mounting (wind protection).Best Deals for UPG 87501 20-Watt Mono-Crystalline Solar Panel
I use this to charge a 18 ah hour battery, it charges it half-Way in about three hours of direct light. Great panel, need more.Honest reviews on UPG 87501 20-Watt Mono-Crystalline Solar Panel
Using this product for the past few months, I have changed my review from a 4 star review to a 5 star review.This is a great product.
Based off of the STC of 1.1IMP, 18VMP, I have recorded on my volt/current meter that the PTC IMP I have recorded to date is at 1.35 amps AVG. The recorded level of average weather temperature for that recording was at 82* Fahrenheit. VMP is below 18V best recorded VMP to date under PTC 13.58volts. Panel makes great numbers under 80+* fahrehiet weather at roughly 18.33 watts of the 20watt stc condition.
There may be some inaccuracy as to how I recorded angle of azimuth via my current/volt meter , rather than my irradiance meter, how ever I have been looking for the happy medium of volts amps which plugging in the meter into the panel terminals can offer the same results it just takes longer than using an iradiance meter.
This means that the panels under PTC is 91.65% efficient.
This is an excellent panel to use with a PWM 7amp controller with up to 5 panels in parallel, with no need to spend the extra cash on an mppt controller.
This is a great bargain panel.
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