Re: [electricboats] Electric Motor for 40ft Sailboat

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On Thu, Jul 10, 2025, 1:16 PM Myles Twete via groups.io <matwete=comcast.net@groups.io> wrote:

Also very helpful to physically separate these 2 battery "banks" reducing the chance that one could touch BOTH + and – "hots" together.  My boat has 2 groups of modules forward and 2 groups aft, with one group port, one starboard, with the pack voltage nom. 42v (12s lithium ion, 700ah).  If I were to go 96v in this way, it would make sense to segregate the port modules

From the starboard modules and arrange as you describe.  There's no way one could physically reach ones arms across the boat to touch the -42v and +42v at the same time.  I could totally use the same chargers I currently use, just have one charger for each bank.  I have oodles of contactors that would suit.  About the only additional investment then for me would be a 96v motor and controller…and with my Briggs & Stratton ETEK brush motor now a veteran of 22 years (and 4 brush sets), I can see a time where this might be a happening!

 

Thanks.

 

www.evalbum.com/492

 

From: electricboats@groups.io [mailto:electricboats@groups.io] On Behalf Of Randy Cain via groups.io
Sent: Thursday, July 10, 2025 4:26 AM
To: electricboats@groups.io
Subject: Re: [electricboats] Electric Motor for 40ft Sailboat

 

Yes, 96vdc can be bad stuff. The bipolar approach mitigates the danger. First, use an isolated system where neither the positive or negative rails are used as the ground (it's normal to have the negative rail connected to the ground in 12v, 24v, 36v and 48v systems). Then, make certain that both rails are disconnected by the disconnect switches, contactors and circuit breakers, not just one rail. Then, connect the midpoint of the battery as the ground reference and safety ground. A bipolar 96v system is then just as safe as a 48vdc system. 

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