Re: Re: conversion of dynamo to alternator

@NormanAnderson wrote:

Hi Roger,

Don’t wish to disagree with Dave in any way, as my knowledge of tractions is miniscule. But I do know a little about DC electrics having done an apprenticeship and qualified as a licensed aircraft electrical engineer in a previous life.

The 70 amps that Dave talks about is only really useful after engine start when the lead acid battery goes into ‘recovery’. The length of this phase should only be a minute or two, though obviously varies according to battery condition.

The chief advantages of alternators (AC generators) over dynamos (DC generators):
1. gives a charge at idle, whereas the dynamo will allow a small battery drain
2. Brushless, so virtually maintenace free
3. Solid state rectifier and voltage regulator. No pesky contacts, no set up, no maintenance
4. Lightweight

The list goes on. IMHO, 45 amps should be more than enough. Just make sure that which you are fitting is quality. There’s a lot of rubbish out there.

I agree with all of the above. You can buy just the bracket from CAS and then get a alternator meant for plant machinery off of e bay.