Lead Battery to Lithium conversion

[Pete7]

Originally Posted by Tupaia

Anyone have a similar setup?

I have a smaller hybrid system for the house bank, but keep the FLA and LFP connected together when on board, isolating the LFP when we are shoreside. Engine start remains an AGM.

Pete

[Toys_with_time]

Originally Posted by Pete7

This is going to be a nice simple yacht solution.

Therefore charge the AGM from the engine and then use a DC>DC charger from the AGM to charge the LFP. That way its all under control and you won't cook the alternator. They also have adjustable settings for LFP.

Two options but there are more:

https://www.victronenergy.com/dc-dc-...ated#downloads

https://sterling-power.com/collectio...rip-proof-ip21

An alternative is https://nordkyndesign.com/product/no...ce-controller/

Enables direct charging of Lithium from alternators with inbuilt regulator eg many Volvo Penta's.

I ended up going the Engines > starter AGM's > DCC chargers > Lithium route

TwT

[fxykty]

Originally Posted by goboatingnow

This the best way. Charge the bank needing the most current directly from the alternator. Charge secondary batteries like the starter with a low capacity dc dc charger . Use an alternator protector to allow emergency HVC cutoff. Clearly your alternator regulator must be capable of lithium charging

This.

But only if your alternator regulator can be set/programmed for LFP. If not, and you don’t want to add an external regulator (which will also add alternator protection such as belt management) then go with charging the start AGM battery first.