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EpRec 20A Solar Charge Controller - System Requirements and Technical Specifications -This Controller is suitable for 3 types of batterie.Battery type description: -B1 is a lead-acid batteries(12V/24V auto) -B2 is a lithium ion batteries(3 strings of 11.1V lithium batteries) Factory setting Default B2 -B3 is a lithium iron phosphate battery(4 strings of 12.8V) -System Voltage: 12V/24V Auto -Charge current: 20A -Max input power and voltage: 240W/24V(12V system); 480W/48V(24V system) -USB output: Dual USB output, 5V/2.5A -Equalization: 12.6V(defaul,) / Discharge reconnect voltage: 10.5V(defaul) /Discharge stop voltage: 9(defaul) -Turn ON/OFF light voltage: Solar pannel 8V. -Self-consume: