I'm with Kevin on this.
If you're turning the alternators with your electric motors, then you're decreasing your available drive power while introducing a net loss of electricity. If everything goes well, it will take an extra 500Wh from your batteries to put 250Wh back. Every watt hour that you generate will probably cost you 2 watt hours due to charging inefficiencies even if your alternators are fairly efficient. Even if you got to an end-to-end 90% efficiency, it's just lost energy. You would do better by leaving out the alternators and using that energy to run a fridge or something, at least you would get some value from the energy drain.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, Kevin Pemberton <pembertonkevin@...> wrote:
>
> sorry using moble device. If this is the case you will only deplete
> the batteries charge. If this is not your plan, give us a better
> view.
>
> On 4/11/11, Kevin Pemberton <pembertonkevin@...> wrote:
> > let me get this straight. You want to charge the batterys from the
> > motors that are draining them.
> >
> > On 4/11/11, james4078 <james4078@...> wrote:
> >> I was wondering who knows the answers to these questions?
> >> I am putting together an array of 6 marine deep cycle batteries to make a
> >> 72
> >> volts battery bank.
> >> I ordered 2 PMA's (permanent magnet alternators that charges up to
> >> 300amps)
> >> to recharge the batteries (each PMA to charge 3 batteries)
> >> There is one 72volt/300amp motor controller running two 15/20hp Permanent
> >> Magnet electric motors as the primary drive and the two PMA's will be
> >> driven
> >> off these to recharge the battery bank.
> >> I want to recharge the batteries individually using 2-12v regulators to
> >> regulate the PMA's down to 12volts(voltage usually increases with the
> >> rpm's). 12 blocking diodes to go each battery (6-negative terminals,
> >> 6-positive terminals) to allow each battery to recharge without any
> >> drawback
> >> form the battery bank.
> >> As the consumption of the drive motors increases with the rpm's so will
> >> the
> >> output of amps from the alternators thus trying to get as close to a 1-1
> >> drain to charge ratio as possible.
> >> So here are the problematic questions:
> >> #1 What size voltage regulators do I use to handle these 300 amp PMA's
> >> #2 Where do I get them?
> >> #3 What size blocking diodes are suggested as well?
> >>
> >>
> >
>
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