Bob, caution with the 4 alternator idea. It would be rare to find "isolated" alternators that could be wired in series to get to 48 volts. Most alternators are "non-isolated", where the negative terminal is the case/ground. 48v alternators, particularly the Permanent Magnet Alternators, seem the happiest route.
Mark Stafford
--- In electricboats@yahoogroups.com, Robert Lemke <robert-lemke@...> wrote:
>
> 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.
> http://www.ebay.com/itm/NEW-10HP-SMALL-DIESEL-ENGINE-WITH-ELECTRIC-START-10-HP-/170672262621?pt=LH_DefaultDomain_0&hash=item27bcdc0ddd
>
> Bob
>
> --- On Sat, 9/15/12, hardy71uk <dottir@...> wrote:
>
> From: hardy71uk <dottir@...>
> 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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