Monday, June 30, 2025

Re: [electricboats] Electric Motor for 40ft Sailboat

I have a CT 41 which is 28000 lbs. Got an AC 34 motor (air cooled) with a Curtis F6 controller from Thunderstruck. I, originally, was going to do 96v but was convinced to go 48 volts for safety reasons. The 48v seems to produce enough power and is way more responsive than a diesel.  I have a 48v battery bank of 16 Eve 3.2v / 280a lifepo4 cells and a 24v house battery with 8 of the same cells. Both banks have a JK BMS. I could go to 96 volts but, so far, am ok with 48v. I can get 4 knots but don't know for how long, yet. I have a Honda 2000 generator that I run on propane. Doesn't really provide enough power and will, likely, be replacing it with something at least 3kw sometime down the road. I am still in the "figuring this out stage", mostly having some issues and steep learning curve with the batteries, balancing, etc., etc.. Very happy with the motor so far. I don't know if I am going to stick with the Eve cells. They are still less expensive than other Lifepo4 batteries, although the prices seem to be coming down. They are much easier to handle at 11lbs per cell, versus around 70lbs for a self-contained 12v / 280a lifepo4 battery, which is an issue for me, as an old geezer. Do lots of research and talk with as many people as you can who have done this before. Take your time before you make purchases. I have found this group to be some of the most knowledgeable people around who have all sorts of experience, which is still in very short supply. Especially if you are going to do it yourself and not use already assembled units. I would say, "good luck", but "luck" his little to do with what you are wanting to do. Careful planning, taking your time, research, and asking the questions you are starting to ask are your friends. 
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