Monday, August 25, 2014

Re: [Electric Boats] Voltage drop underway

 

I would remove the caps and inspect the cells under charge for excessive off gassing.
I would clean all terminals long before I replaced the battery bank.
Because one cell can be a problem I would test with hydometer all cells.

It shouldn't be done, but one bad cell can be replaced i.e. one battery and you might get a couple extra seasons out of the bank before you would need to replace  the whole bank.

The question would be; what would another season be worth in dollars and cents.

Kevin Pemberton

On Aug 25, 2014 9:23 AM, "oconnell_brad@yahoo.com [electricboats]" <electricboats@yahoogroups.com> wrote:
 

Hi everyone,

I have an electric yacht motor, driven by 8 Trojan T105 batteries, wired in series to produce 48Vdc. I have owned the system and the batteries for  6 years. I have noticed this year that I am getting really significant voltage drops while underway.


I can see the motor controller display going from 48 down to 24 Vdc, all within an hour, under what I consider to be normal cruising conditions and amp draw.


I guess there may be two problems.


1) A resistance problem- maybe thermally induced ( but I don't think so)

2) The lead acid batteries are crapping out on me.


Has anyone had this experience? What should I do to determine if the batteries are due for replacement?


please advise, Brad

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Posted by: Kevin Pemberton <pembertonkevin@gmail.com>
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