Hi William,
It sounds like it would work, but I think that the 5hp requirement might be a little optimistic. A rule of thumb that I have heard is to size the engine at double the alternator/generator output, in this case it could put about an 8hp load on the engine. Of course your 18hp diesel should be able to handle it anyway. Recognize that the 2900W alternator can put almost 7 times as much load on your engine as your current 420W alternator. Imagine how your engine will react when that kicks in.
Plus I don't see this arrangment as being very efficient. You lose something everytime you run through another device. Having the alternator operate at your intended DC voltage cuts out the losses from the extra components. Your Dual Pro maxes out around 800W (15A x 13.7V x 4). You would be better off generating 48VDC (nominal) but your plan should work. Give it a try and let us know how it works out.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, william munger <wmunger@...> wrote:
>
> 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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