30A PWM Solar Charge Controller, 12V 24V Dual USB Solar Panel Battery Intelligent Regulator with LCD Display, Auto Parameter Adjustable, Timer Setting, Multiple Load Control Modes

This worked like a charm. I plan on buying some more so I have them on standby.

So far so good

Works okay, but the last unit I had was 12V only, and not 12/24V. There's no switch to toggle between the two. It senses the voltage and configures itself to that mode automatically. I noticed something it though my 12V battery need to be charged at 24V. For the price its not bad, but the setup and menu is confusing, and the instructions are in Chinglish, so you sometimes have to read between the lines. I can make it work but again there are better options in the same price range.

Excellent

No sirve

Works ok when it works. I bought two and one would not work at all. The remaining one works well without problems.

I had it plugged into a panel and batteries for about a year straight. Finally wore out. But for about $10 it took a lot of punishment.

I bought one a year ago and it has worked so well that I bought a second one