HQRP 12V / 24V 20 Amp Solar Power Charge Controller/Regulator 20A for Solar Home System 300W / 600W with LCD screen and HMI plus UV Meter HQRP&reg; Solar Charge Controller plus HQRP&reg; UV Meter; Float Charging Voltage: 13.8 Volt; Low voltage disconnect: 11.1 Volt; Low voltage Reconnect: 12.6 Volt; Max. battery voltage: 32V; Working temperature: -20C to +55C; Self-consumption: 6mA maximum; Terminals: for wire sizes to 6mm2; Communication: TTL232 / 8pin RJ45; Electronic protections: Overheating, Over discharging, Over charging, Load overload, Load short circuit, PV reverse polarity, Battery reverse polarity. Type of Charging: series PWM. 200 days warranty!