Kevin,
If you have 4 pumps in series connected to 48 volts, you are only guaranteed that the total voltage is 48 - not that each pump sees 12 volts. If some are dry, some are wet, and some are clogged, etc, you might have 6 volts on one pump, 8 on another, 20 on the third, and 14 on the last one. That adds up to 48 volts, but pump one will bog down and stop while pump 3 will spin way too fast. That is not a workable situation. Only if all 4 are identical (both manaufacturing specs and the load) will they see 12 volts each.
Pat
--- In electricboats@yahoogroups.com, Kevin Pemberton <pembertonkevin@...> wrote:
>
> Pat,
>
> I think so. the idea is 4 pumps in series activated by one switch. This
> is not 4 switches activating each pump that is tied in parallel per
> battery. Should work and sounds like quite an Idea. Think about it, the
> bilge gets pumped even if one or two pumps become clogged.
>
> Kevin Pemberton
>
> On 02/14/2011 04:53 AM, greenpjs04 wrote:
> >
> > Perhaps I have misunderstood Myles' suggestion, but when putting
> > anything in series, balance becomes important. If the four twelve volt
> > pumps are identical and loaded identically, then each will see 12
> > volts. However, if 3 are dry and one is wet, the wet one will have a
> > higher load and its voltage will drop causing problems. If the pumps
> > are tied to each individual battery, then some of the problem goes
> > away, but the original objective of keeping all four batteries
> > balanced still hasn't been achieved since the four loads can vary by
> > quite a bit unless all four pumps are loaded equally (all pumping
> > water of equal depth to outlets at the same height).
> >
> > Pat
> >
>
> --
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