I see no reason to disconnect the batteries from the alternators.

In an emergency you can se a set of jumper cables to crank the motor.

I keep a set of jumper cables in a waterporof bag in the bilge of my bass
boat, although its usually just to swap batteries around.

"Jason" wrote in message
...
I'm building a new battery system for my Albin 27 trawler. The boat
previously had a 1-2-Both-off switch and two banks of batteries. My new
engine has two alternators and I'd like to take full advantage of this
set-up. My plan is to install a dedicated starting battery with an on-off
switch, a dedicated house bank with an on-off switch and then have a third
switch to parallel the banks in an emergency. This system is explained in
detail in Calder's book and seems to be a good match for my boat.

My question is this; Assuming I connect one alternator to each bank, what
happens when I parallel the batteries? Will the two alternators feeding
into the system cause any problems? 99% of the time the two systems would
be totally independent.

Thanks,
Jason

Albin 27 FC- "Tonic"
http://www.people.cornell.edu/pages/jek15/



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