Flank speed at 36V, standard speed at 24V and low speed at 12V sounds real good but battery energy equalization management is going to be too complicated and at times impossible. You could also reverse the voltage on a depleted 12V battery when it is powering your boat in series with less depleted 12V batteries. Also, charging a battery bus with cells in series and cells at different states of charge (SOC) could cause overcharging for some of the cells. Lastly, using a small generator as a hybrid system for long range would also become a complicated project.
With 6V batteries you can build two discrete 18V busses. Start out with the two 18V busses in parallel and switch them in series for a burst of power at 36V. I read somewhere that old Diesel Electric submarines utilized this method before the invention of switched mode power conversion. Having said all of the above, repairing the controller (if it is repairable) might be easier than designing with mechanical switches in DC circuits.
Welcome to the group and good luck.
Welcome to the group and good luck.
Ahmet
From: "Fish Canoe fishcanoe@yahoo.com [electricboats]" <electricboats@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Friday, October 6, 2017 10:04 PM
Subject: [Electric Boats] Running trolling motor at lower voltage (and using on small sailboat)
Hi all.
New to the group here.
Anyway, gonna dive right in.
First, I've found a 100 lb thrust trolling motor, but it sounds like the controller is on the fritz. So, first question is can I just wire the motor directly to the batter source and run it at full power? Secondly, what happens when I run it at a fraction of the voltage it is designed for (again, directly to the motor). This trolling motor runs on 36 volts. So, if I run it at 24 volts what kind of power am I going to get out? My engineering sense tells me it would be 2/3rds squared or 4/9ths of full output. And at 12 volts 1/3rd squared or 1/9th full power.
I could probably live with those three power settings.
Now for the application.
I recently acquired a Bolger Old Shoe sailboat. For those not familiar with it, it is a sharpie. Bottom is only curved fore/aft and is flat left/right. Sides are vertical. Length is 11 ft, beam is 5 ft. Has a full length keel a bit over 1 ft "tall".
The interesting thing about this boat is the keel is hollow and has a width of about 7 inches, just enough for you typical battery (I suspect that was the plan all along). Enough space for 3 100AH batteries.
My idea is to power the boat running the at 24 volts which as mentioned above....pushing along at about 50 lbs? thrust. For marina work ...12 volts.........if high winds/waves 36 volts
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Posted by: sv8827 <sv8827@yahoo.com>
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