Is ther a difference between "electromagnetic power" and "thermal power" here? If a panel is not connected, there is no conversion and the surface is warmed - just like any other surface exposed to the sun gets warmed.
PV panels are just like charged capacitor or a chemical battery with no loads: just holding unused potential differences with no damage to the unit.
PV panels are just like charged capacitor or a chemical battery with no loads: just holding unused potential differences with no damage to the unit.