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From: Jim Fidler (no email)
Date: Tue Dec 02 2003 - 13:05:39 EST
Marin
I think the answer to your question depends on lots of things including the
size, degree of discharge and overall condition of the two battery banks as
well as the cranking demands of the engine(s). Fortunately most of the
time it probably works out ok to parallel the batteries although there
could be a problems in some cases.
A 12 volt house battery with no shorted cells can measure over 10 volts
no load even if it is fully discharged. Current will not flow from the
starting
battery into the house battery unless the starting battery voltage exceeds
the 10 volts of the dead house battery. While your engine is cranking
the starting battery voltage under load probably drops to about 10 volts so
little or no current will flow to the house battery. If the house battery
has one or more cells that are actually shorted then it could get ugly.
A house battery with open cells wouldn't take significant current.
Jim Fidler "Fiddlesticks"
==================================================
>Brent wrote:
>What happens when the "house" battery bank is badly discharged and you try
to start the engine? Does not sound good to me.
===============================================
Marin wrote:
snip
I understand the notion of a dead
or weak house battery drawing down the start battery to the point where
there's not enough to turn over an engine, but it doesn't seem to work that
way in practice.
snip
if you
have two batteries, one fully charged and the other almost discharged and
you combine them together, do you not have the sum of the power available?
snip_____________
C. Marin Faure
GB36-403 "La Perouse"
Bellingham, WA
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