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!

This is 2 in a series, Under less than ideal conditions averaging 97.5w per panel. I am pleased so far.

So far the panels are doing their job as they were intended. I'm happy with them and the price was good.

I use 10 of these panels to power my tiny home on wheels and it does great! What I like best about these particular panels is that the 100’s are small and easy to move and install. Especially, on smaller roofs like a tiny home!

5/19/2024 the 10bb panel delivers maybe 20 more watts than a 9bb and thats with a charge controller that doesnt buck or boost the panel voltage to fit a optimal curve of the panel not to say 9bb and 10bb arent the same rating wise because a buck or boost probably would equalize the output that being said the dimensions differ 10bb=38.1 x 22.6 x 1.2 inches 9bb=41.8 x 20.9 x 1.12 Inches also 10bb in noticabally heavier my 9bbs get dissasembled and assembled daily for a year know and have taken all the bumps and dings of stuffing into my little storage shed i just have a fobia of a metiorite hitting it while i am asleep off coarse there are also animals too the electric connectors do get loose over time from such activity they where desined to be plugged in and left for eternity or until they corrode and ignite sincerely your comrad buenos diaz mey muchochos