Re: [PSUBS-MAILIST] Does size really matter?

[Rob Innes <innespace@jett.net>]

Herve

Thanks for clearing that up for me. Also I'm wondering what type of battery is
preffered for use in DPVs; Dry cell, gel cell, AGM, Lead acis? I like all the
benefits of the Deep cycle Optimas except the price and the weight (40#+ each,
would make for a heavy son of a bitch) I run a little gel cell in my dolphin
which has been faultless and has been very well abused. Even though they are
totally sealed, they say that they should not be contained in an airtight
container. I presume they only gas off while being charged. I'd like to seal
the batteries in semi-permenently and charge them through a charging port. Any
problems there? Thanks

Rob



Herve wrote:

> Rob,
> 107/36 is pretty oversized for a DPV, however 3 batteries 12V 40Ah in serie
> will give you the max thrust expected for that motor but for no more than 30
> mn full power run.
> the technician was right, 200Ah rating batteries is what should be the right
> choice for that motor. with a good 3 hours capacity
> power is the same regardless the Ah of the batt, but 36V : full power, 24V:
> reduced power, the more Ah the bigger the battery size the longer will run
> the motor. the Ah of a battery represents the "amount " of energy available,
> when the voltage "represents" the power
> Herve
>
> ----- Original Message -----
> From: "Rob Innes" <innespace@jett.net>
> To: <personal_submersibles@psubs.org>
> Sent: Friday, November 08, 2002 11:20 PM
> Subject: [PSUBS-MAILIST] Does size really matter?
>
> > I just bought a Motorguide 107# 36V trolling motor that I want to use to
> power
> > a DPV. One supposed expert told me if I discard the circuit board and run
> power
> > directly to the motor I could get much the same amount of thrust using
> only 24V
> > as long as I had enough amperage out of the batteries. Another , so
> called,
> > expert tried to tell me that the amperage or (Ah) was only important for
> > running time and to run as much Voltage as the motor could take. As I'd
> only be
> > under water for short durations, I'm not so concerned with how long the
> > batteries run for, as much as I am concerned with reducing battery size
> and
> > weight. My question is, Can I maintain maximum thrust by using smaller
> output
> > batteries, i.e. hooking up 3 small 12V 40 Ah batteries in series. A
> technician
> > from motorguide said I should run batteries of at least 200 Ah. Which
> battery
> > rating is most important for maximizing power output or is 36 volts the
> same,
> > regardless of battery size. Any well informed advice greatly appreciated
> >
> > Rob
> >
> >
> >
> >
> >