Bests & Worsts Reviews from Amazon

I test a lot of solar cells. These are an excellent value and a recommended buy. So why only 4 stars? Because this, like almost all solar companies, claims a "theoretical, lab-value" wattage, not what they actually produce. Until they start advertising wattages at close to real world conditions, then they will not get 5 stars from me. Test Conditions: Florida, April, Clear sky, noonish, 75 degrees, panels pointed directly at sun (so pretty much real-world ideal) Epever Triron MPPT 30 amp charger, LiFEPO 175 AH battery about half charged. Two Newpowa 200watt (claimed) panels tested. They averaged about 170 watts during my test (varied between 165 and 175 with perfect sun). That's an 85% actual-to-claimed wattage, which is fairly typical. I saw 11.3 amps (at 15.4 volts) output, which is pretty close to their claimed maximum operating amps of 11.76 (but they claim that at 17v, hence their 200 watt claim). Keeping all that in mind, I connected both in series and the MPPT charger was pumping a pretty steady 23 amps into my battery at around 13.7 volts - pretty nice for two panels of this size range. The power per square foot comes out pretty comparable to similar panels I've tested in lower wattages. They almost come out to $1 per watt which should be a target for anyone looking for solar panels now. You can get some for slightly less than $1 per watt but then you need to factor in support, reliability, warranty, etc. One of my favorite panels is the RICH SOLAR 50/80/100 Watt 12 Volt ETFE Flexible panel - they reach claimed wattage and are tough and lightweight, though more expensive per watt than glass frame panels because they are flexible (but they are great for extra panels that need to be portable). The BougeRV 170 panels are nice too. If you don't know how to test a panel, please don't post a review about them not delivering power. I highly recommend the Epever Triron MPPT chargers. I have two and will probably buy more.