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Old 23-10-2020, 10:22   #1
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Join Date: May 2020
Location: North Carolina
Boat: Hans Christian 33t
Posts: 61
Future planning for battery bank (banks)

So currently my boat has 4 12v agm in 2 banks. 2 of them are new, 2 are "ok"

I'm not a real big fan of how it's wired, but it "works" for now with the 2 banks, selector inside etc. Oddly, the windlass isn't on a selector (one thing I don't like, but whatever)

My "future" theory is to keep the batteries in the same area, but go lithium, with 3 12v 100 and then the 2 new AGM being a dedicated bank for engine/windlass since they are 2 months old, hard to financially justify replacing. Instead of trying to have the solar and "primary" charger deal with different batteries, what I was thinking was to add this:
https://www.renogy.com/200a-battery-isolator/
to handle charging from the engine over to LiPo, then have a DC to DC charger to go from LiPo over to starter bank. So this to handle charging the other direction if needed: https://www.renogy.com/12v-dc-to-dc-...ttery-charger/
Then have a LiPo charger for when plugged into shore, and let it us the DC to DC to make sure starter batteries are good instead of trying to have two AC chargers or 1 charger handling different battery types.

I know I'm over simplifying, but to me it seems the isolator would be less trouble than having a charger on the side going from engine bank to house when motoring? And save some cash. Or am I missing something?
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Old 23-10-2020, 11:01   #2
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Join Date: Jul 2020
Location: SoCal
Boat: Beneteau 323
Posts: 93
Re: Future planning for battery bank (banks)

I can't help you with the answer, but suggest that you call Pacific Yacht Systems. I believe they consult on these topics and have lots of experience designing and implementing all sorts of electrical designs.
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Old 23-10-2020, 20:21   #3
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Join Date: Feb 2017
Location: Colorado, Annapolis, Florida, Bahamas, Maine, etc.
Boat: Antares 44i
Posts: 367
Re: Future planning for battery bank (banks)

I am not sure I understand your intent from your description. Why not charge your engine/windlass bank from your engine, charge your new lithium bank with solar/generator/shore power, and use a DC/DC charger to route excess power produced by the engine from the engine bank to the lithium bank. You can carry a small automotive charger that you can power from your inverter to cover the emergency case where you have drained your engine bank but have power left in the lithium bank.

If you have a smart regulator on your engine alternator then you would not want to try to charge both banks from the engine as you would have to program the regulator with charge parameters for a single chemistry.
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