Sounds like an expensive kluge…
You won’t get close to 7kw of charging out of that setup.
Cheap automotive alternators are probably only about 65% efficient and you’d want to run them at their upper speed rating to get the most efficiency out of them. So you’d probably need to gear up with 1:2 or so. Even if you were to get 75% efficiency out of each alternator and if the diesel were able to deliver its full rating of 10HP mechanical, the most you could hope for in electric output would be around 5kw, or 1.25kw per alternator. At 12v each, that’s 100amps continuous from each alternator. Meanwhile, the alternators alone will be producing 400watts of heat each.
I’d like to understand how you expect to get 7kw of electricity with this arrangement.
-Myles Twete, Portland, Or.
www.evalbum.com/492
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Robert Lemke
Sent: Saturday, September 15, 2012 10:42 AM
To: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] Re: 48v diesel telecommunications standby gen?
Good thread. I am considering using a new 10 hp air cooled diesel on ebay for $619 and (4) automotive alternators to charge a 48 volt bank. Entire set up should be only $1K and produce just shy of 7kw of charging. Bob
--- On Sat, 9/15/12, hardy71uk <dottir@hotmail.com> wrote:
From: hardy71uk <dottir@hotmail.com>
Subject: [Electric Boats] Re: 48v diesel telecommunications standby gen?
To: electricboats@yahoogroups.com
Date: Saturday, September 15, 2012, 10:27 AM
I'm thinking of using a 3phase generator . Use three transformers to bring the voltage down to the required value . Make the output DC via a 3phase rectifier. Should make a simple charger.
Chris S
--- In electricboats@yahoogroups.com, Michael Mccomb <mccomb.michael@...> wrote:
>
> other than the Panda stuff which is VERY expensive has anyone come across a 48v dc diesel charging system.... i'd rather use a sort of RAID approach with a much less expensive diesel/PMA system but am pushing the limits of my understanding to devise such a system.... seemingly both diesel engines AND permanent magnet alternators of sufficient power/capacity can each be had for under $1k... some electronics is undoubtedly needed but adding this would still bring a system in perhaps 10k under the Panda price
>
> one can stumble across all sorts of reference to 48v diesel units used for telecommunications systems but i have had great trouble actually tracking such a unit down
>
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