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Old 24-01-2025, 18:29   #1
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Proposed LiFePO4 Conversion

I recently purchased a 1988 40' monohull that has generally been very well-maintained, but the electrical system is a complete hodgepodge and I would like to replace it with modern tech.

The current batteries (both house and starter) are at the end of their life, and I recently had to replace the late 80s era Inverter/Charger with a new Victron MultiPlus II, so I am inclined to stick mostly with Victron equipment (except batteries).

Attached are some photos of an early version of the designed I'm working on, and I'd appreciate any (gentle) feedback and also some specific answers, if anyone has them.

1) I'm installing two identical 560Ah LFP batteries. Most sources suggest merely paralleling them. I'd rather not run long 000 wire runs to a switch -- how important is it to be able to isolate them from each other?

2) Is it wise or even necessary to put a VE.Shunt between the battery input and the alternator input into the system, to determine and report different charging parameters?

3) The WakeSpeed 500 appears to be the go-to for a distributor regulator, but some wiring diagrams include a shunt near the alternator, but others don't? This is probably somewhat related to the previous question.

4) I have a dual-purpose 140Ah LFP to replace the existing (dead) AGM starter battery. The existing Balmar DuoCharge would appear to be more than adequate to keep it charged -- any concerns/considerations regarding this?

TIA for any advice. Once I get a rough draft I need to work on fusing and breakers.



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gnetwerker is offline   Reply With Quote
Old 25-01-2025, 09:10   #2
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Re: Proposed LiFePO4 Conversion

LiTime and all drop-in LFP batteries have an internal BMS. The Victron BMS that you show only works with Victron batteries that require an external BMS.

Batteries are usually paralleled at the busbars usually close to the batteries. I have never heard of requiring batteries to be isolated from each other with a switch. Please correct me if I am wrong on that.
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Old 31-01-2025, 05:51   #3
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Re: Proposed LiFePO4 Conversion

Quote:
Originally Posted by jcapo View Post
LiTime and all drop-in LFP batteries have an internal BMS. The Victron BMS that you show only works with Victron batteries that require an external BMS.

Batteries are usually paralleled at the busbars usually close to the batteries. I have never heard of requiring batteries to be isolated from each other with a switch. Please correct me if I am wrong on that.
its normal/good practise with lithium to have an isolator for each parallel battery
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