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SD20 and LS-1A 'net' available power

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rtitsworth

Joined: 16 Jan 2006
Posts: 76
Location: Detroit, Mi

Posted: Fri Sep 03, 2010 8:36 pm Post subject: SD20 and LS-1A 'net' available power

Bob,



I am doing some system load planning/balancing for a Z14 dual bat/dual bus

type setup.  I have 28V SD20 and LS-1A as Alt#2.  For the sake of

discussion, assume the alternator is turning 3500 rpm and generating 20amps

of current (per spec).



How much of this current/power would typically be re-consumed to drive the

regulator/alternator field at max 20 amp load (i.e. what is the available

"net" power)?



I know the std/recommended LS-1A setup has a 2A breaker on the sensing lead

and a 5A breaker on the field lead, but I'm guessing it actually consumes

less than 7 amps of it's 20 amp output (or is that already 'netted out' of

the 20 amp spec).



Rick

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