Tuesday, January 24, 2017

[Electric Boats] Re: Could you evaluate my project?

 

As of for the bike battery pack, this is in my design only for emergency purposes, so I can assist docking with some propulsion if the main bank is dead.


For my main battery bank I might have come to another conclusion.
I spoke with a professional marine electrician, who made consider Gel-batteries instead.
The price will be half, and complexity much lower. He also did mention the risk (however small) of having Li batteries onboard.
The weight can be put in place where it could actually be useful (the boat has a small list because of its design), and the overall weight would still be a reduction.
The bank will then be 4 x 120 Ah Gel batteries of high quality.

Another thing I have read several places (online), is that LiFePo4 batteries should not be held at full charge for longer times. This would be no problem with he Gels. Comming to my boat, to a bank only say 70 or 80 percent would, would negate the advantage of the Li's (besides weight of course).
Is this correct with the LifePo4's?

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Posted by: jesper@ruben-hansen.dk
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