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

["Herve" <caribsub@coqui.net>]

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
>
>
>
>
>