[Public-List] alternator

[John Boor]

Right on

John Boor
MAHSEER #380

> To: Alberg 30 Public List
> From: Dave, #156
>
> If you have a 100 amp alternator (lots of cruising boats have that or
> larger) and it's charging flat out at 14.4 volts the power output is 100 x
> 14.4 = 1440 watts which is about 2 HP. Taking various inefficiencies into
> account it could take as much as 4 HP to drive the alternator. Now, you
> would seldom be putting that kind of load on your alternator unless the
> batteries are way down or you're running a water maker as well as charging
> batteries, etc.
>
> You can disconnect the field of the alternator without harming it but do
> not turn off the battery master switch with the alternator under load. You
> blow the alternator diodes for sure. If the "ignition" switch turns off
> the B+ to the field terminal on the regulator you'll be OK. (Unless you
> have an electric fuel pump, for example.)
>
> Why not have an extra cup of coffee and stay on the hook until the current
> slacks off?
>
> Dave
> Chuave' 156
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