If you are charging batteries, why not add a large alternator instead of a 120v generator head? 200A Leece Neville alternators can be had on Ebay for under $200 all the time, and even 270A ones show up reasonably priced.
Which every way you go, if you are going to drive using belts – take care of the allowable side load. Not sure of the Yanmar’s specs, but pulling that much HP on a side-load belt might cause overstress.
Another approach is direct drive. If you used the AC head, you would need to control the RPMs carefully (I am assuming the Yanmar will rev up to 3600RPMs), but if you direct drove one of the large frame LN alternators (4800/4900 series) they will start producing strongly at 2000RPMs and would not need a fixed speed. Direct drive (e.g. via a flex coupler) would eliminate any issue with side loading.
-al-
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Aaron
Sent: Thursday, April 12, 2012 10:51 PM
To: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] sailboat house battery bank questions
Ebay has 9 hp watercooled diesels for around $1000 that would be a cheap way to go
From: william munger <wmunger@programmer.net>
To: electricboats@yahoogroups.com
Sent: Thursday, April 12, 2012 6:56 PM
Subject: Re: [Electric Boats] sailboat house battery bank questions
Ok, I am leaning toward getting 4 4D 12volt Deka batteries for my house bank. My thought is this, can I replace my 35amp Alternator with an AC Generator head like this
http://www.northerntool.com/shop/tools/product_21008_21008
to power my DualPro 4 bank charger while the diesel is running? That way each battery has its own charger instead of one alternator charging 4 batteries.
It puts out 2600 continuous Watts. 21.7 Amps at 120 Volts. Has two 15 Amp, 120 Volt outlets with 11 amp breakers. The DualPro pulls about 7amps I think so it should be enough to power it.
I have a 2QM20 Yanmar thats rated for 18HP and this says it requires 5HP.
I know I will need to figure out the proper pully and belt sizes to and maybe an electric clutch to kick in and out when the engine RPM is in generation range.
So my question to you guys with real life experience is this, am I overlooking an issues with this?
Thanks,
William
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