10A Solar Charge Controller PWM with Dual USB

Connecting a solar panel straight to a battery risks overcharging it the moment sunlight is strong and the battery is already full; a charge controller sits between the two specifically to prevent that, regulating charge current with PWM switching and cutting off once the battery reaches full charge. This controller auto-detects whether it is on a 12V or 24V system rather than needing a manual jumper setting, and handles up to 10A of charging current from panels up to 50V input.

A dual USB output (3A at 5V combined) lets the same setup charge phones or power small 5V electronics directly from the solar/battery system, useful for off-grid or portable setups where that is the actual point of the build. Protection circuitry covers short circuit, open circuit, reverse voltage and overload conditions, plus dual MOSFET reverse current protection specifically guarding against the battery discharging backward through the panel at night.

Common uses are small off-grid solar setups, solar-charged battery banks for remote sensors or lighting, and any 12V/24V battery system charged from a solar panel needing real overcharge protection.