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!

These things are freakin awesome! I get over 100 watts at peak solar gain hours, and they have proven to be tough as nails. Had a 6' step ladder fall on them, but nithing broke. Also had the wind rip them off a temporary/portable mount, and fling them on top of each other, with no damage. Forget flexible panels, and figure out how to mount these units on your van, RV, or boat, if you just need a small system. I am running three of these, through a cheap (Renogy) PWM charge controller, and feeding into a 100ah lifepo battery. Runs my fridge, charges all my devices, cordless tools, fans, and anything else I need. Excellent product. Excellent value.

Works great. I purchased my second one and together they are giving me over 10 amps of power. Bifacial is working great.

We have purchased several of this brand in the past and very happy with the quality.

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.