Thanks!
It just seemed to be a more controlled approach using the AC Gen head and the DualPro. Each leg of the dualpro monitors temp and charge for the battery its attached to so, I was thinking it was safer then blasting all 4 batteries with 80A. But taking into consideration the time to charge and the flexibility to balance one a month or so without harming the batteries, it would be easier (and cheaper) to use the alternator.
William
Hi William,
I just re-read your post and I totally missed that you're talking about a 12V battery bank. (I just mentally default to electric boat voltages now)
A simple high output marine alternator will charge your batteries twice as fast as the Dual Pro. Here's a cheap 80A Yanmar marine alternator:
http://amarket.com/mes382m.htm
I typically used Balmar alternators and regulators, they are high quality but are considerably pricier. Use the alternator while underway and use the Dual Pro to balance your battery pack from shore power. You should only need to balance your battery pack every 20-25 cycles or every couple of months, whichever comes first. Of course, it won't hurt to balance the batteries more often than that.
Fair winds
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> 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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