B787 battery
don't know the solid state relays used but the units I've seen all have a protection diode which will pass current in the reverse & care is always needed where they are used. i.e. useful only where one DC source is involved or any other component or wiring failure cannot profide a DC backfeed source.
Regards
Last edited by bill good; 21st February 2013 at 22:20.
Reason: ps