HQST 2pcs 100W 12V Monocrystalline Solar Panel, Up to 25% High Efficiency Module, Waterproof for RVs, Motorhomes, Cabins, Marine, Boat and Any Other Off Grid Applications-Upgrade Version

Easy to install, works great. Charges and power ups my battery to almost the stated Volts. The outer mounting rim seems secure . I consider them very light weight as my truck camper's roof had no problem raising or lowering(popup).

These were the most cost effective solar panels available on Amazon I think. That may be different when you read this but currently I think it's the case. I bought 4 during covid, then bought another 4 recently. They are all rated for 100 Watts, with a very small difference in open circuit voltage. All panels checked out and landed within open circuit voltage listed on the panels. Connected with 15 foot bougerv solar wires and connectors into 2 MPPT controllers. Wired in series I believe. Can't remember right now. With properly rated wire between the controllers and the battery, we are still getting 5 - 600 watts out of this setup, max. I expected much closer to 800. We are going to try a series/parallel setup next to see if we can get closer to the 100 watt value of each panel.I'm not disappointed with them. They are cheap solar panels. If you have a premium of space - buy nicer ones. I knocked off a star for the lackluster performance. I will come back later if the series/parallel setup proves out to be much more efficient but I doubt it. That being said - they didn't come with mounting brackets so figure that into your cost. They are very light but seem well made. I have no complaints at this time, based on my expectations. It's just that under load they don't perform at 100 watts with my specific setup. Install was done with an electrical engineer, so I have no doubts they are properly wired up.

I installed one for my shed and is charging my Pecron Battery. Works great!!

Great product and great price. I use 8 of these in a backup power system with 4 Lithium 100 ah batteries on my out building.

UPDATE: First purchase was 11/22/24: Today is 01/06/25:I've been using two of these panels for about 4-6 weeks. Normally, they keep my Acemo topped off, but the last two days were cloudy, and I discovered this morning that I had a bad wire connecting to the panels.It is currently 4:30PM and the sun is well over the other side of the apartment leaving the panels in the shade pointed away from the sun. You can see the reflection of the sun in the clouds. If I backed up, the sun would be just below the clouds on the right.Even in the shade, the two panels are charging the Acemo at 25 watts, now that I replaced the wires. I often get 30-35 watts in the shade, but I'm not getting much reflection today.During the morning when the sun is shining on the panels, I get up to 135-140 watts. When I mount them on the roof below them, they will get more light while the sun is overhead, and during the summer, they will get a whole lot more sun, for several more hours a day.The online calculator for this area says the best I can hope for is 60-65% of the panel's ratings, so 50% is the most I had hoped for and I'm over that mark.I currently only power a few things on the Acemo to keep it exercised. It's primary purpose is to provide power when the grid goes down. With 4 panels, I hope to remove my computer station and lights entirely from the grid. I have them, I may as well use them.My original plan was to hinge two of these panels together for a portable array, but they are really too heavy to port around easily, so I'm going to leave them mounted to the low roof and power my apartment as much as they can.I've seen complaints that someone received different panels when he ordered at different times. I ordered one single, later one pair, and most recently, one more single. I can't tell the difference between any of the panels. so I have not had that issue.The input to my Acemo is just shy of allowing me to use two panels in series. That's ashamed, because I would love to pair them up instead of running all of them parallel.The bathroom scale says that each panel weighs 14.4 pounds.Original Review:I now have 3 of these panels. The first one is in the window and the two new ones are #1 and #2 in the first picture. I was getting 83 watts of charging into my power station compared to 30 watts from 50w panel #3 and 70w from 100w panel #4. They weigh 14.2 pounds by my scale, but the other panels did not reach the minimum measurable weight on my personal scale.The two yard sticks are in the pictures for anyone wanting to compare sizes.For this time of year, 83w is about the most one would expect to get at this latitude this time of year. It probably helps a bit that the temperature outside was only 32 degrees when I got that reading.The wall you see the panel laying against is facing east. In the afternoon to evening, it is in the shade. During mid-afternoon, it was still charging at 25-30%. Of course, when the power station hit 100%, it quit charging.I read some of the negative reviews and they complain about low power and a weak frame. It's hard to know why someone had low power. There are a lot of factors to consider. As for the weak frame, these panels do seem heavy for such a thin aluminum frame. Panels 3 and 4 have the same frame material thickness as this one does. This one seems much heavier.Right now, I am satisfied with my purchase and I am especially happy with the price.