HQST Bifacial 100W 12V Solar Panel, 9BB Monocrystalline Solar Panels with 25% High Efficiency Module PV Power for Battery Charging Boat, Caravan and Other Off Grid Applications

So far so great! For the price you will not do better. These are double sided (in short on the back side they capture reflected light and boost the overall output. I am getting well over 100 watt on these 100 watt panels). I am not sure how long they can maintain such a low price, however, one panel is a great price and two panels bought together is over the top amazing. Super simple standard connectors and if you need straight wire connections the wire quality is great for stripping and utilizing (this most likely voids warranty, with that I can see no reason why you would need to use the warranty as the panels are solid and well built. As for the double sided feature, the concept calls for the panels to be mounted off the surface so that reflected sun light can hit the underside. So if your brackets are up allowing light to get underneath these are for you. You do need a controller, pick a good one. PWM controllers are not as efficient as MPPT. You pay more for MPPT and it is well worth it (look for deals). In my specific DIY application I am doing a 360 degree rotational rig so that the panels are always facing the sun. For seasonal adjustments I will set the pitch (or seasonal angle manually 4 times per year, i.e. Summer Winter solstice and spring and fall equinox). ~20 degrees to about ~40 degrees towards equator). I am using a slow high torque motor and a timer (motor speed .6 RPM the timer is on 4.17 seconds every hour). A slip ring keeps the power line from twisting. Fun little project.... Be well!

I'd give 5 stars but the packaging was not that great but they were really cheap so it maakes sense very pleased so far Beat the heck out of eco worthy not the greatest packaged but arrived undamaged I applied mylar to the back of the 4 panels I got and even though it's end of may and june is another day away when the clouds have cleared and it's the brightest from 1pm to roughly 4 pm I have achieved 110 watts a panel , the bifacial 4 panels I got also out perform the 5 other panels I have on cloudy days by sometimes up to 25% which really shocked me , the other 5 are eco worthy and arent bifacial so bifacial is the only kind i'll get now as it's mostly cloudy in the PNW this time of year When there are no clouds my 4 bifacial panels get the fan on my 1000 watt grid tie inverter running very loudly and both sats of panels do this Have only had them up for a couple months and my first regular panels cut my power bill by 35% so am very much waiting on my next bill to see the difference as my first set should even be an improvement as I had a bad connector and didn't notice for at least a week as I was working so much overtime that month I didn't have much chance to see them operating during sunlight hours Overall VERY impressed with hqst as head to head the only thing eco worthy beat them on was packaging quality , I would have to give hqst a 5 star rating and hopefully the best is yet to come , the only downside is the bifacial panels create the tiniest amount of power in the dusk hours as they should but my wired meter most times has to be disconnected from the system and the system being completely re started for them to read voltage again correctly , sometimes they kick back on properly but not always That's on the cheap 150 amp meters and not the panels but THEY DO WORK WELL I got them when they were on sale for $59 and expect after summer the price will drop again so I will by more then as I have no real complaints and when weather cooperates they outperform expectations so for that they get 5 stars , washington sunlight negative 3 stars but at the price they will pay for themselves in 3 to 4 months including the grid tie inverter and wiring so great deal and hope tarriffs don't make em harder to get down the road

Bought 1 to test. Looks to be well built, Used once to test it and verify that it might meet my needs. Bifacial was not a factor for what I need. The highest output was 88 watts with most time spent in the mid-to high 70's which was good enough but not great. It was in near perfect alignment and within the specs of my power station. i will test one more time before deciding to buy more.

I purchased this solar panel because it was an awesome price. When I received and opened it I found that it seemed to be a good quality product but to my dismay it didn’t have any mounting brackets or extra wiring. Be sure to carefully read the product description because not all cheap deals are good deals.

I was a bit disappointed in this panel. It came very quickly but was very poorly packaged compared to another panel ordered from another seller. Even more disappointing was that it barely met the output specifications under full sun. The open circuit voltage struggled to stay at 19.25v and the short circuit current struggled to get above 6.2A. It is very unlikely this panel will actually manage to output at full 100W, and I expect it to be more in the 90-95W range. I will set this up with my MPPT charger and see what it manages to output. All that given, it was pretty inexpensive even for 90W.