RENOGY Rover 20 Amp MPPT Solar Charger Controller c/w BT. Efficiency in tracking, conversion, and heat dissipation. 4-stage charging with auto 12V/24V voltage detection. Multiple electronic protections ensure system safety. Supports remote monitoring via RS485 communication port. Remote monitoring with RS485 communication port. This controller is able to quickly release heat helping to maintain peak performance, protecting your batteries and system components. Size approx. - 210 x 151 x 68mm.