[Upgraded] 30A Solar Charge Controller, Black Solar Panel Battery Intelligent Regulator with Dual USB Port 12V/24V PWM Auto Paremeter Adjustable LCD Display (30a)

5 stars! It does the job for the rock bottom price of $10. Be amazed!Ok, here is reality. I have used this unit for 7 months to experiment with a 100W system.It regulates the charging of my very nice no maintenance lead acid batteries. It knows how to do this and most of the time it also knows that I am setup in 12v mode.1. Do not use the 12v extension or the 5v USB connections. They really are not functional for any reasonable current output. The board will stress, a resistor heats up on the board and the LCD will blink out temporarily.I have not fried the board but I would advise connecting all power draw, USB or otherwise through a fuse block directly from your batteries.Sometimes the controller decides for no good reason that you are in 24 volt mode. This isn’t good because it seems to happen when my battery is almost fully charged over 13V. That means it will try to overdrive well over 14V and possibly 6 or more amps into a full battery. This is no good.If you catch this your first easy sign is the battery charge picture will say barely charged… Disconnect the solar, then the battery… Wait 15 seconds then plug the battery back in… Carefully connect your solar panel. Pray it stays in 12V modeAt the moment I unplug the solar panel when the battery is mostly charged and the system decides that it’s 24V. I am only using this as a test bed drawing small energy for 5V USB networks at the moment.When I get serious and add more power and a proper converter I will pay good money for a real controller.So, great for the low price of $10 , great learning tool but pay real money if you want a reliable system you can count on.