1. Got it, I'll switch to 30a, you're right & I understand.tony.latham wrote:Three things jump out at me.
1. A 40 amp breaker protecting a 10 AWG wire from your panel. It should be a 30 amp breaker. But why that heavy of wire? You'll actually get about 6 amps from your single panel at solar noon, not the 7.9.
2. The wires from your controller. The positive is 10 AWG and the negative is 4 AWG. They should be the same and 4 AWG is gross overkill. 12 AWG for both is fine.
3. A 40 amp breaker on a 10 AWG wire (again).
Make sure add a battery meter such as the AiLi.
Tony
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