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Forum: Lithium Power Systems

13-09-2018, 11:05

Replies: 291

LFP FLA hybrid

Views: 20,811

Posted By mbartosch

Re: LFP FLA hybrid

Yes, this will be a piece of cake for the bank. (E. g. Winston cells are rated for continuous 3C, at 2C you could bowthruster your boat in small circles for half an hour nonstop without them breaking...

Forum: Lithium Power Systems

13-09-2018, 09:17

Replies: 291

LFP FLA hybrid

Views: 20,811

Posted By mbartosch

Re: LFP FLA hybrid

I'd probably not worry too much about that. The LFP bank will happily drive your bow thruster. Quick calculation: I remember you mentioned 10 HP (~ 7.5 kW) - this would be a bit less than 600 A at 13...

Forum: Lithium Power Systems

13-09-2018, 07:52

Replies: 291

LFP FLA hybrid

Views: 20,811

Posted By mbartosch

Re: LFP FLA hybrid

That's what I observe as well. If I allow my bank to reach 100 % SoC I can see it's approaching the 13.8 V set point, then the chargers drop to float (set to 13.3 V in my case) and resting voltage...

Forum: Lithium Power Systems

13-09-2018, 07:27

Replies: 291

LFP FLA hybrid

Views: 20,811

Posted By mbartosch

Re: LFP FLA hybrid

Amazingly the OP message which you conveniently full-quoted states that the OP already does almost exactly what you recommend - and yet Simon is not satisfied with the results (emphasis mine):

...

Forum: Lithium Power Systems

13-09-2018, 03:41

Replies: 291

LFP FLA hybrid

Views: 20,811

Posted By mbartosch

Re: LFP FLA hybrid

A proper HVC on an alternator is quite easy. Field current to alternator goes through the NC contact of a standard 12 V automotive relay. This relay is then responsible for the HVC cutoff of the...

Forum: Lithium Power Systems

11-09-2018, 10:42

Replies: 291

LFP FLA hybrid

Views: 20,811

Posted By mbartosch

Re: LFP FLA hybrid

A voltage spike can happen, but on a correctly designed system this will have no impact.
Only on a badly designed system this might be a problem (e. g. a single contactor for isolating the bank from...

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