my guess would be that due to battery efficiency you would need to put back about 60 amp-hours . Something like 3 hours of bulk charge at 15 amps = 45 AH plus about 2 hours as the charge current tapers off to an average of about 7.5 amps =15 AH . total time around 5 hours.
regards
Chris S
--- In electricboats@yahoogroups.com, Mike <biankablog@...> wrote:
>
> "if you had a 100% efficient charger that would take about 6 hours for an average input of 800watts. Say 8 to 10 hours for a reasonably efficient real charger."
> Â
> Chris:
>           That was my experience during a recent cruise. According to my XBM battery monitor I used 42 amp hours during one leg of the cruise and also said that the bank was down to 79% from a full charge (100%). I stopped at a marina and plugged into shore power. Started charging using my Dual Pro PS-4 at around 5 pm. When I got up in the middle of the night around 3 am to use the head all the batteries in the bank were fully charged
> Â
> Capt. Mike
> http://biankablog.blogspot.com
>
> --- On Sat, 7/10/10, hardy71uk <p0054107@...> wrote:
>
>
> From: hardy71uk <p0054107@...>
> Subject: [Electric Boats] Re: Battery charging time
> To: electricboats@yahoogroups.com
> Date: Saturday, July 10, 2010, 10:28 PM
>
>
> Â
>
>
>
>
> Well I estimate on the back of an evelope as follows-> takes about 1.2kw hours per battery . so 4.8kwh total . if you had a 100% efficient charger that would take about 6 hours for an average input of 800watts. Say 8 to 10 hours for a reasonably efficient real charger. I'm guessing that the honda 1000 could probly provide 800watts continuous.
> Efficiency wise I think we are talking around 6.5KWH input for about 4KWH to the motor.
>
> Chris S
>
> --- In electricboats@yahoogroups.com, Aaron Williams <akenai@> wrote:
> >
> > If I had a 48 volt system with 4 12 volt 100 amp hour batteries how fast could they be charged. If I had a 10 kw generator how much would be wasted.
> > What I am wondering is if one of the Honda 1000 gen sets is more than adequate?
> >
> > --- On Fri, 7/9/10, hardy71uk <p0054107@> wrote:
> >
> >
> > From: hardy71uk <p0054107@>
> > Subject: [Electric Boats] Re: Anyone have experience with 144 volt motor systems?
> > To: electricboats@yahoogroups.com
> > Date: Friday, July 9, 2010, 2:38 PM
> >
> >
> > Â
> >
> >
> >
> >
> > Good points . but usually the greatest efficiency loss comes from using a gen to charge batteries . Best practice might be to charge from shore power and run the motor some of the time from the generator to conserve the battery power. DC motors can be run from an ac supply via a simple rectifier.
> >
>
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