Inverters / Bypass

Nordhavn50 Nordhavn50 at
Wed Mar 18 19:55:44 EST 1998

In a message dated 98-03-18 19:51:05 EST, you write:

<< In any case, the problem is simple.  If you let the stock alternator charge
 the batteries, it starts out by dumping huge numbers of Amps into them
 (which is OK), but it tapers down to a very low charge rate way too soon.
 This is because the automotive regulators they put into our boats are
 designed to hold batteries in the fully charged state.  They are not
 optimised to recharge batteries from a flat condition. >>

Most alternator output drop off is incurred through temperature rise.  A cold
alternator can put out 130% of rated capacity, dropping to 60% when the stator
gets in the 95 degrees Celsius range! <ouch>.  Some mfr.'s rate them at a
certain temp, others rate them at startup (cold).

David Allen

Aboard  "Iniki"

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