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That’s what I thought but I have switched everything off.
If the current is preceded by a '+' sign it indicates a charge. A '-' sign indicates a discharge.Sometimes, the current isn't measured by a proper shunt and it needs calibrating to read an actual zero. Not sure if this applies in your case. Another alternative is that you haven't quite managed to switch everything off.
So where is the charge coming from, solar panel is disconnected & it’s not on hook up.