I believe the boards are the same just that 1200 use 2 elements 821 uses 1 element.
Thank you.
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2010 Cameo F34CK3, 500ah GBS LFP, 1280w solar, Magnum PT100 SCC & 3012 hybrid inverter/ charger, Installed 4/2016 been on 24/7/365, daily 35-45% DOD 2,732+ partial daily cycles.
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