400 Watt Solar Panel, 2 Pack of 200W Monocrystalline Cell High-Efficiency PV Module, 12V Solar Panels for Homes Camping RV Battery Boat Caravan and Other Off-Grid Applications (400W)

With 10 bus configuration, this definitely puts out a lot of power up front with an open circuit voltage of twenty four volts In direct late morning sun @ 5 amps closed circuit clampmeter reading, The higher open circuit voltage will be problematic plugging directly into one of these all-in-one lithiumSolar generators, which are made for 18 to 19 Volt max oc solar blanket input, and thus may give error, reject anything in 22 to 24v input range. That said anybody complaining about output, needs to do a proper closed circuit measurement with DC clamp meter, Otherwise, with a normal d c m multi meter using leads, youll need to have a load that can draw 5 to 6 amps, running your leads in series to get accurate reading. I'm giving it 4 stars due to a dent in the back of the panel frame and the poor packaging and minor detail such as way leads are sloppily soldered in junction box, and data sticker slapped on crookedly, indicating rushed cheap manufacturing process fueling doubt about longevity. Otherwise good power great size, competitive price.

I bought this flex panel and a similar-priced competitor to do side-by-side testing. Before buying the 10 panels I need, I wanted to see which ones worked best.I had 2 panels side-by-side facing the sun, and alternately connected one then the other to the IntelligentMPPT controller I bought. This Werchtay panel output 90W, while the other panel only output 40W. So I returned the other one, and will be buying 9 more of these!

I mounted them to the top of my truck that's right to power my portable air condition system I even did a review on that one already I have three of these solar panels from the same company on the roof of my truck and they provide an excellent power source and very happy with my selection

I had high hopes for this being a 10bb panel. I got the 200 watter. With a uv index of 9 in direct sunlight pointed directly at the sun it made 170 watt briefly then down to 120 watts. Not all that great considering I removed (3) 75 watt panels to use this. I ended up putting 1 of the 75 watt panels (newpowa) in parallel with this one to get back up to 170 watt.

Great product, price & delivery

This is only 180w. The panel I received is not labeled like the one in the description, just know you’re purchasing 180w not 200w

Use as add on series panels with another brand and see no difference. They seem to preform well. I have no problems.

I'm only getting around 50 watt but I did get one with a Crack in it. Was given $20 for my inconvenience so it's OK.