Meet the newest addition to the Renogy Rover Series, the 30A Rover-Li MPPT Charge Controller. Featuring innovative MPPT (maximum power point tracking) technology with high tracking efficiency up to 99%, it’s designed to maximize the energy from solar panels to charge your system. The Rover-Li is not only capable of self-diagnosing errors, but it can also automatically detect 12V/24V systems. Also, it is a negative ground controller, which ensures compatibility with any negative ground system. Any negative connection on the solar module, battery, and load can be safely earth-grounded as required Pair this MPPT charge controller with the battery of your choice, from sealed to lithium. This 30A charge controller is encapsulated with a sturdy case that protects against general wear and tear. It also includes an aluminum heat sink for heat dissipation. Compatible with the Renogy BT-1 Bluetooth Module, users can connect to and monitor their solar power systems in real time, straight from their phones.