Solar regulator protection, if the battery is removed from a solar setup without disconnecting the solar panel there is a good chance the regulator will blow. So having inadvertently lost a few regulators on a setup used to charge spare batteries I have pondered on the use of a relay to connect the solar power to the regulator. Power for said relay coming from the battery being charged. So remove connections from the battery and sold panal automatically turned off thus protecting the regulator. It seems too simple what am I missing and if that simple why is it not built into regulators already.