I'm looking for a premade (manufactured) power board/regulator that I can use in a docking station type synario where the robot comes to home base, plugs into the docking station, and then switches from its battery power sourse (internal) to the docks supply (external).

Switching from one to another via relay seems a bit messy in terms of bounces or spike but this may not be necessary with only a 12vt supply?

Perhaps too if the EX-B fails due to a very low power situation, the robots internal power supply could out to an onboard solar panel to trickle charge... until sufficient charge allows for an auto reconnect to the EZ-B Builder software to get it back to the dock.

Anyone got any links to good boards?