T&T: Alternator replacement

[Chuck and Susan]

The standard formula is


Amps x Volts = Watts

Watts / 745.7 (one HP) = Electrical HP Produced by the Alternator

HP x 15% Efficiency Loss = HP Loss

HP + HP Loss = Total HP Used



Example:

57A x 14.9V = 849.3 Watts

849.3 Watts / 745.7 = 1.14 HP

1.14 HP x 15% = 0.17 HP

1.14 + 0.17 = 1.31 HP Total

To follow our adventures, go to

http://trawler-beach-house.blogspot.com/

http://sea-trek.blogspot.com/

--- On Fri, 4/17/09, Ross Lappin <rosslappin at hotmail.com> wrote:

 

>> Upgraded one of my engines from the Standard 53 AMP Motorola
> To a Leece-Neville 90AMP Marine.
>
> The Specifics: Item: 110-603, part number 8MR2070TA
> I added a 3 inch 1/2" belt pulley to replace the 3.5 that came standard
with
> the Motorola and the Ford L.(a little more amperage at idle)


Rich



Do you know what the horespower drop is supposed to be after this change?  I
heard of a formula of x number of HP loss per y number of amp difference.
Perhaps the list can contribute.

I am considering doing the same for my Perkins 135's



Ross