Doug,
To a first order of approximation (i.e. "for all practical purposes") I would guess the answer would be "yes".
Putting two banks in parallel will be ABOUT as good as running a higher voltage motor.
Technically, I suspect the higher voltage motor will be more efficient.
But that's only at low power levels.
The Torqeedo 4R will produce a lot more thrust at max throttle than the Torqeedo 2R.
If you knew you would never need the extra power of the 4R, then definitely go with the 2R - 24V systems are much easier and less expensive to deal with because you have the option of starting with just one battery bank, and adding as many more as you want. If you want to add another 24V bank, it's much cheaper than adding another 48V bank!
From: "dougmcq000@yahoo.com" <dougmcq000@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Thursday, February 20, 2014 6:03 PM
Subject: Re: [Electric Boats] Torqueedo 2.0, a good fit?
To: electricboats@yahoogroups.com
Sent: Thursday, February 20, 2014 6:03 PM
Subject: Re: [Electric Boats] Torqueedo 2.0, a good fit?
John,
interesting suggestion regarding halving the power drain by upgrading to 4.0R at 48 volts.
Can I get the same sort of effect by having (4) 12v batteries set up as follows:
1. Create two 24v banks by putting a pair of 12vs in series.
2. Then connect the two 24v banks in parallel.
Thanks for the info
Doug
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