GCSOAR PWM Solar Charge Controller 10A 12V 24V Auto Work Max PV Solar Panel 100W/300W Solar Regulator with Dual 5V USB Ports LCD Display Overload Protection Timer Setting ON/Off (GC1024)

For my system this controller works just fine. Likes the fact that it's got 2 USB ports, too! Delivery was fast, and Amazon locker pick-up made it very easy away from home.

Seems to work ok. Adjustment difficult

Used it on my sailboat for the season with a small 10W panel. In a sunny week it would charge my battery OK but it would drain it within a week overcast sky and would continue draining even when the battery voltage reached the set shutoff voltage (which I set to 11 V. One drained it to about 6V. Good thing it is a marine deep cycle battery as it would be shot otherwise. I will take it out and charge directly with the panel which does not reach dangerously high voltage levels even in full sun in July. Definitely not recommended or small systems where every bit of energy created should be preserved. Concerned even for bigger systems because of the drainage past the low setpoint.

it will work perfect for larger solar panels and systems but for smaller systems it will use up useful energy that is coming from the solar panel and the battery voltage can go low.I have used other charge (bought on Amazon) controllers and it has worked perfect in small systems

I bought this to do some solar project s and works just perfect.

Deer Feeder panel. Build a Critter proof mount and works Perfect

I have the controller hooked up to a 12 volt group 27 battery at 12.8 volts and a 100 watt solar panel. Neither of the USB ports work - why? The unit doesn’t display the solar output voltage, or that battery voltage just the set output voltage which I don’t need to use. Battery setting is correct - just wanted to use this to charge phones. Disappointed.

It did not light the bulb.