Actually there are two of them, replace this 20A with 30A. The best charge controller! The company's support team sent me the complete addressing protocol for the RS485 port so I could connect an industrial computer (PLC) to it. They were just great as it's a bit out of the norm. I have AmpereTime's 12V LiFePO4 batteries in parallel and in series for a nominal 24V system and it charges them well. The initial programming is a bit cumbersome at the beginning. look, but overall pretty basic. It is very important that LiFePO4 batteries are NOT charged below 32F. This is a rare problem in my crawl space, but it can happen, and batteries are too expensive to screw up with frozen charging. The charger has a setting for high and low battery temperatures, but the manual doesn't say if charging would stop. So I tested it with ice and in fact it stopped charging at 0ยฐC (32ยฐF) and wouldn't let it start again until it reached 10ยฐC (50ยฐF).
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