I'm starting to toy with the idea of switching LiFePO4
when my Cofl Cart batteries
need replacing. When researching I started to wonder about using a small LiFePO4 battery
to power the windlass
and (thruster - When I eventually get one).
The twist here is that I have a LA battery
in the bow that is charged by an Echo Charge which has a 14.4 V max output and could be a good match to 3.6 V LiFePO4 cells.
I'm interested in hearing if anyone has done this (used an echo charge as a poor mans BMS with out cell level monitoring).
The configuration would be:
Main charge buss to 60 amp breaker
#6 cable runs forward from 60 amp breaker to Echo charge in the forepeak
Echo charge to 60 to 100 AH LiFePO4 battery
LiFePO4 battery to windless via 1/0 cable and 400 amp fuse
LiFePO4 battery to thruster by 1/0 cable and 400 amp fuse
60 amp breaker from #6 cable to 1/0 cable (echo charge bypass - normally off)
Normal operation has the LiFePO4 feeding the windlass
and thruster with the echo charge taking care of charging
Should the LiFePO4 die or be flat the bypass breaker can be activated which allows the house bank to supply (up to 60 amps) to pull up your anchor
(needs low drag to avoid tripping the breaker).
Should the echo charge die the bypass breaker can be activated to allow charging
the LiFePO4 from the house bank (and engine
Hopefully this is not too confusing without a schematic.
Is the echo Charge up to it? Will >100 AH LiFePO4 handle no "real" BMS? Comments, thoughts etc?
N.B. Tried searching for this to no avail