Sunday, January 18, 2015

Re: [Electric Boats] Charging batteries

 

I'll hijack this thread. Talking about larger boats and generator charging, in the past I have priced Fischer Panda and Polar Power DC generators. Even for their fairly low power models in the 3-5KW range they want a sizable cost premium over similar AC generators. At 15,000 for a 4KW generator I had limited interest.  I recently found an Italian company Sincro that makes generator backends that quoted a very reasonable price for a 100A 48volt backend which my current Kohler 7.5 KW generator should handle with ease. In the 2000 dollar range I am seriously considering it. 

http://www.macfarlanegenerators.com.au/products/675/Sincro-FB4-24-and-48-VDC-Low-Voltage-Alternators

The Sincro mates via J609b, I have no ideal what my old Kohler mating and bolt pattern is but I am guessing it is not J609b so I most likely would need an adapter plate made.  

Anyone here know what standards are common for generator connection to the backends? Any potential pit falls that I am likely to run in to?  My Kohler rpm is in the supported range, so if the adapter does not cost to much to make, this could be viable option for others.  

On Jan 18, 2015, at 12:49 PM, mike@electricyachtssocal.com [electricboats] <electricboats@yahoogroups.com> wrote:

 

Eric was correct in his response.  I noticed the same thing but did not respond as I thought it was a casual misstatement. The BMS system is not built in to any cells even with LiFePO4 but they are connected to the cells.  The best marine specific built batteries have them included in their battery packs and anyone who spends the money of LiFePO4 batteries should always have a quality BMS.
As we have begun re-powering larger boat with larger battery packs and marine gensets, we have been recommending consideration of the same battery management system that is critical for LiFePO4 batteries also be incorporated in large AGM packs.  Rather than monitoring individual 3v cells, monitoring the 6, 8 or 12 volt batteries themselves.  It would also be prudent to use chargers that monitor heat both at the charger and at the battery.  Using alarms would be wise as too much in your face data going to the helm could be distracting. 
Just applying good practices.
Mike
Electric Yachts of Southern California

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