Hi , im currently finishing a project for meassuring the current and voltage drop of load connected to a solar pannel. For that im using an INA219 connected to a ESP32. Here is a simplified version of the circuit.
You could put a diode in the leads from the solar panel to prevent electricity from flowing in the wrong direction.
Easiest way that avoids any change to input voltages is to use keyed connectors on the solar panel and on the board that it plugs into.
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