Solar Charge Controller REGDUO 10A PWM 12/24V for two Batteries Camper Boat
Amazon.com : EPsolar EPIPDB Series Duo-Battery Charging Solar Controller 10A for RVs, Caravans, and Boats + Remote Meter MT-1 : Patio, Lawn & Garden
Amazon.com : EPEVER EPIPDB-COM Series Dual Battery Solar Charge Controller 20A 12V/24V Auto Work for RVs Caravans and Boats etc Duo Battery Solar Charging System : Patio, Lawn & Garden