James, what exactly do you mean when you say a 6v battery cannot be monitored? If you can monitor a 12v battery, then surely you can monitor any battery with any number of cells, right? I check the voltage of each battery before and after every outing or full charge, and occasionally even when on float. A BMS to do this automatically and shut down the system when it is in a fault condition would not be rocket science to implement. I'm sure you have a reason for your statement, but a clarification would be nice for us less knowledgeable types.
Certainly, keeping it simple is better. I agree that parallel wiring has serious drawbacks. And fewer user maintained connections is better, of course. But often the form factor of the 6v battery, with the fairly large amp hour capacity, presents advantages for a particular installation. I personally hate lugging 4D or 8D batteries around. A GC2 or even an L16 is much easier to handle. Honestly, if cost was less of an issue AND I wanted a higher capacity bank at the same voltage, I would go with single cells. Yeah, more connections. But if properly implemented and occasionally checked and tightened if needed, and using nice fat cable, it's not such a terrible thing. I check all my connections every time I check electrolyte level or SG. Only takes a minute. With a 48v bank of 6v batteries, I have 8 batteries connected. With 12v batteries, I would STILL have 4 batteries connected. So it's not like 12v batteries eliminate a possible bad connection. They only reduce the not so very high risk by a factor of 2.
---In electricboats@yahoogroups.com, <james@...> wrote :
The Electric Propeller Company
625C East Haley Street,
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805 455 8444
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On Jun 6, 2017, at 7:40 AM, Jeff LaCoursiere jeff@... [electricboats] wrote:
That isn't correct - 12 x 6v in series would be 72v. The OP was originally correct - 2 sets of 6 x 6v, the two sets in parallel.
I'll throw out a guess that you could then keep your original chargers, and use them in the same manner - just charge each 36v bank just like before.
j
On 06/06/2017 07:33 AM, Daniel Michaels nov32394@... [electricboats] wrote:They would all be in a series. One battery charger. Same as a golf cart.
I recently bought a 2002 Canadian electric boat Fantail Launch. It has 36v system, with two groups of three 12v batteries in series, then the two groups linked in parallel. There are two ProTournament series 3-step marine battery chargers, each dedicated to one of the 3-battery groups.
I fear the current six 12 v Interstate batteries are approaching end of life, and I'm interested in changing over to the 6v golf cart batteries with the higher amp hours capacity.
I need a 36 volt system for the current motor. So, would I be linking 12 of the 6v batteries: two series of 6 in parallel? Would I need two more charges to charge the added 6 batteries?
Thanks, and Regards.
M Kirkwood
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