Hi Mike, the voltmeter is sufficient to drain the 7.2 if it is not being charged. I would isolate the 2 batteries with a proper isolator (off road shops have them) or install 2 diodes from the charge circuit rather than using the "bus tie switch". Like Mark I would use them as an 'either-or' source, only.
Can you draw your circuit and scan to pdf for me so I can have a look. Paul Smith Brisbane, AUSTRALIA pk.sm...@bigpond.net.au http://kr2spacemodulator.blogspot.com/ -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of laser...@juno.com Sent: Wednesday, 15 April 2009 4:48 AM To: kr...@mylist.net Subject: KR> Back-up electrical system Mike writes: I've done the same and recently wiped out (over a 1½ week period) my smaller battery by flipping a switch that links both the main and back-up system.
