T-Pain Is On A Boat: Re: [Electric Boats] Portable chargers?

Sunday, August 16, 2009

Re: [Electric Boats] Portable chargers?

Sorry, mixed up my numbers...15amps going into the batteries is the sweet spot (230AH bank @48V). Leaving 9amps extra for "cruising".

-K

--- In electricboats@yahoogroups.com, "aweekdaysailor" <aweekdaysailor@...> wrote:
>
> I have been playing with this a bit as well. I have (3) 1200watt 48VDC telecom power supplies (very nice integral fans, etc). I hooked them up without the batteries to my 1600watt generator. Ran fine up to about 30amps (1500 watts) - that killed the engine. This is a conventional generator, but I think load will always lug the engine to die on any of them - even hondas.
>
> I also have run the same setup with the batteries (only good for bulk charging), and it's interesting -- on a depleted bank with only 1 unit (1200watt or 24amp), as I throttle up - engine pitch changes at about 15amps - so 9amps going into the batteries seems to be the "sweet spot" for charge acceptance on that bank.
>
> -Keith
>
>
> --- In electricboats@yahoogroups.com, "Eric" <ewdysar@> wrote:
> >
> > Myles,
> >
> > That's good news to me. My proposed chargers are (2) 48v - 15A units, 30A into 48v, the same 1440w total. I hope that the Dual Pro chargers are as efficient as your chargers are.
> >
> > The second battery bank and charger will be added after the boat is converted and operating again, so I'll get a chance to check out how the charger performs ahead of time, while I still have only one bank.
> >
> > Eric
> >
> > --- In electricboats@yahoogroups.com, "Myles Twete" <matwete@> wrote:
> > >
> > > Eric-
> > >
> > > I have driven 2 chargers with my EU2000i Honda successfully all day long.
> > >
> > > It is critical to be able to adjust how much you draw from the Honda.as
> > > example, plugging in a 20a, 36v charger only partially loaded the genset.
> > >
> > > Adding a 28-amp 36v charger brought the genset to its knees and it quickly
> > > shut down with the overload light coming on.
> > >
> > > I removed one of my 4amp Vicor charger modules---same story.
> > >
> > > I removed another one.at that point the Honda was able to steadily deliver
> > > 40amps into my 36v bank---i.e. 1440w continuous (to the batteries) was about
> > > all the Honda EU2000i was able to deliver (probably 1.6kw to the chargers)
> > > and is about spec.
> > >
> > > SO no, you won't be able to plug 2- 48v, 20amp chargers in at one time
> > > unless you can throttle one back.
> > >
> > >
> > > -Myles Twete, Portland, Or.
> >
>