This is why solar MC4 connectors say do not connect or disconnect when the system is energized or under load, big electrical arcs will ruin the connectors and obviously your thermostat contacts. A DC rated thermostat would be rated for battery power, not this arcing stuff. Want to see why?
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While it’s nice to have the options, we felt the extra connectors made for overly complex cable runs and worry about difficulties in diagnosing problems should something go haywire. Also, unlike cables using locking MC4, Anderson or XT-60 connectors, these cables can be disconnected by a simp...