100 Watt Solar Panel 12 Volt High-Efficiency Shingle-Tech Monocrystalline Module PV Charger for RV Battery Boat Caravan and Other Off-Grid Applications

I was pleasantly surprised by this little panel. I work in off-grid solar, and I have been looking for a set of all-black solar panels to put over the windows on my shuttle bus. These panels have the right style and shape I was looking for, but none of the reviews for the 100W panel showed real-world power output above 54W, which is pretty bad.In the solar industry it’s common and expected that a 100W rated panel will never actually put out 100W in real world conditions. An output of 75-80% of the rated output is pretty normal for any given panel, but 54% of rated output is pretty bad. Still, I liked the look of these panels, and at $75 I figured I’d just buy one to test out, fully expecting that they would turn out to be mis-labeled 75 or 80W panels that would never put out more than 50 or 60W.To my surprise, I found that I was able to get 81-84W when the panel was angled towards the sun, and about 50W when hanging totally vertical on the side of my bus, which far exceeded my expectations based on the reviews. To be fair, I am in Southern California in March, which is probably the best solar conditions you can get in the continental US, but still 84W out of a 100W rated panel is pretty good. The build is sturdy enough, and the all-black style makes it look like a much more expensive panel.Something to note is that at 18.15V, the operating voltage of these panels is quite low compared to other 100W panels, which are usually in the 20-25V range. Many solar generators require more voltage than 18V to charge efficiently, so check the minimum input voltage on your charger before you buy - you maybe be better off with 2 of them in series to get a higher voltage. My solar generator (bluetti EB240) has a minimum input voltage of 16V, and it charges no problem with one of these panels.The panel is quite vulnerable to shading, however, due in part to this low operating voltage. If even one corner of one cell is shaded, the output drops significantly. If even half of the bottom two cells are shaded, the voltage drops below 16V and it stops charging. This is common for a panel like this, but it’s something that’s worth noting. Don’t expect full output unless the panel is mounted in full unobstructed sun all day. Some higher-end panels, like the ones made by EcoFlow, have special cell architecture that makes them much more tolerant of partial shading, and will only lose power proportional to the area shaded, but they’re also a lot more expensive.If you have a rack or AC unit on the roof of your vehicle that might shade any part of this panel over the course of day, even a little bit, it will greatly reduce your output, and you might want to consider a more shade tolerant panel. But if you don’t need partial shade resistance, then these are surprisingly decent panels for $0.75/ watt, and they look great.

I have two of these purchased a few months apart. They started off performing well delivering around 90 watts during the middle of the day. Soon after purchasing the second panel the first one's performance started to drop significantly. Open circuit voltage was 21vdc but short circuit amps dropped to around 4 amps and would continue to drop over time. Over a year later that panel still puts out 21 volts open circuit but the short circuit amps are down to under 3 amps. The newer panel is now starting to follow the same pattern. Oddly enough I now get the worst performance during high noon as the output dives off a cliff by 10am and picks back up around 3pm. They actually put out more power when it's a little overcast vs bright sunlight. I'm currently running these in series through a Victron MPPT controller which used to show them putting out 41vdc and over 150 watts but now the combined voltage under load is around 20 and around 60 watts of power at high noon. I replaced the MC4 connectors, re-soldered connections in the J-box on the back and no improvements. In the dumpster they will go. Do not buy.

I bought one of these panels for a small solar system to power some ham radio gear. It is very sturdy and works very well. I just have it laid on the ground with one end propped up. It charges my battery quickly. I plan on ordering two more as I am going to power my whole radio room with solar.

Out of the box very solid build compare to other brand panels I have . Now watt output is horrible- on my Ecoflow portable station only reads 80 watts top but average around 60-70watts. ( this is Florida sun with no shade) Contact customer service, they say can’t use Ecoflow to show the performance of the panel. Only multimeter, so the current is lower than spec, but now no more response from them.

I bought 3 of these because of the size and one put out 5 amps while the other two, closer to 3 amps. Returned two and the two new ones put out 5 amps.5 amps is still low for a 100w panel but because of the size I will make do. I'm able to squeeze in a 4th panel and just ordered a 4th. If I can get 10 to 20 amps in various sunlight conditions I will be happy even if they are not the most efficient panels.I will say that the manufacturer has improved packaging and the newer panels look a little better made, but the newer ones did not come with corner caps and the edges are very sharp.

We are saving so much money on our electricity bill after installing these! Super easy install.

Product was better than I expected, puts out what is required of it. Highly recommended.

I ordered this particular solar panel because I needed a very narrow one to fit my RV. These are only 17.7in wide as most are 21". As you can see from the pics, the corners come protected. However, there wasn't any protection on the front glass. I would purchase these based on size alone. I will edit my post in the future over the longevity of these.