65ah * 61 = 3965ah (@12v. multiply 61 * 4 (244 batteries) for 48v)
this would power a 200 amp load for 10 hours or so.
http://www.green-trust.org/peukert/Steve Spence
Renewable energy and self sufficiency
http://www.green-trust.orghttp://arduinotronics.blogspot.com/On 10/16/2010 07:20 PM, Kirk Mason wrote:
>
>
> So, when a motor manufacturer says his 48 volt motor is capable of
> handling up to 200 amps, to provide that kind of amperage from the kind
> of batteries described here, one would need 16 of them?
>
> --- On *Sat, 10/16/10, Dave /<
dasilvor@rarius.co.uk>/* wrote:
>
>
> From: Dave <
dasilvor@rarius.co.uk>
> Subject: Re: [Electric Boats] Which Amperage?
> To:
electricboats@yahoogroups.com> Date: Saturday, October 16, 2010, 1:35 PM
>
> Well spotted Carel, I didn't see the other half of the question. :-)
>
> The use of the higher voltage set up reduces the size of the wiring
> required. If you are going to draw 260amps your wiring will have to be
> much heavier than if you are drawing 65. I would think though that
> Carels final option would be the most useful. 16 batteries, in a 4 by 4
> block.
>
> Cheers
> Dave
>
>
>
> On 16/10/2010 13:47, Carel Ruysink wrote:
> > Dave is correct.
> >
> > For the second part of your question;
> > If you have 4 batteries 12V/65Ah in series you get a battery of
> 48V/65Ah.
> > If you have 4 batteries 12V/65Ah parallel you get a battery of
> 12V/260Ah.
> > If you want 48V/260Ah you need 16 batteries, ie. 4 rows of 4
> batteries.
> >
> > If you discharge at a higher rate than C10 (or C20 as some
> manufacturers use) than are the usefull amps less or discharging at
> a lower rate it will be more (peukert effect).
> > Do not use more than 50% of the rated Ah or you will ruin your
> batteries in no time.
> >
> > Carel.
> >
> > ----- Original Message -----
> > From: Dave
> > To:
electricboats@yahoogroups.com> <
http://us.mc545.mail.yahoo.com/mc/compose?to=electricboats@yahoogroups.com>
> > Sent: Saturday, October 16, 2010 2:27 PM
> > Subject: Re: [Electric Boats] Which Amperage?
> >
> >
> >
> > What the figures mean is that the maximum amps you can safely
> drag out
> > of the battery for cranking an engine over (etc) is 950amps.
> Below a
> > certain temperature (no idea what that will be, but the
> manufacturer
> > will provide that info) that figure drops to 750amps. The final
> figures
> > is how long you can draw a certain number of amps before the
> battery is
> > flat. This last figure is usually calculated at a ten hour rate
> (C10),
> > so theoretically you can draw six and a half amps for ten hours
> on a
> > fully charged battery. As soon as you increase the discharge
> rate, you
> > lose capacity. So if drawing thirteen amps, it will probably
> only last
> > four hours instead of the expected five.
> >
> > I hope this helps.
> >
> > Cheers
> > Dave
> >
> > PS.. I've been lurking for a while so thought I ought to start
> > chipping in. I used to race electric model boats, so am
> facinated by the
> > idea of having a boat with electric propulsion. My long term
> goal it to
> > have a narrowboat on the UK canals using an electric drive
> perhaps in
> > the same configuration as a diesel electric train to improve fuel
> > consumption.
> >
> > On 16/10/2010 13:12, Kirk Mason wrote:
> > > My 12-volt Optima AGM batteries have three Amp ratings: 950
> cranking amps; 750 cold cranking amps; and 65 amp hours.
> > >
> > > When it comes to relating that to motor specs, to which do I
> refer?
> > >
> > > Say I have four of them wired in series for 48 volts. Does
> that mean my battery pack has 260 amp hours?
> > >
> > > Is that what manufacturers mean when they say their motor is
> rated for 48 volts and 200 amps?
> > >
> > > Thanks,
> > >
> > > Kirk
> > >
> > >
> > >
> >
> >
> >
>
>
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