My own lithium bank is rated at 1C, I choose to limit it to 0.5C for longevity.
I also charge to max 90% (13.6V) when on the boat
and max 70% (13.2V) when not on the boat
- discharge is electronically limited to 20% SOC even though they can be fully discharged without immediate (noticeable) damage.
All the above is done in the name of longevity because they cost a lot of cash and I want to look after them as best I can.
So can you run your bow thruster off your LiFePO4
bank? In my opinion yes if the operating current of all concurrent loads remains below 0.5C, otherwise I would advise against it.
If you have a lead acid bank for starting then use that for your bow thruster. If you only have LiFe and it is rated to start your engine
then by all means use it to run the bow thruster as well (but not at the same time!)
From Solarcity INC -
How to Find Happiness With LiFePO4 (Lithium-Ion) Batteries
"How fast those lithium ions get yanked hither and yon has an effect on cycle life as well. In light of the above that should be no surprise. While LFP batteries will routinely do charging and discharging at 1C (i.e. 100 Amp for a 100Ah battery), you will see more cycles out of your battery if you limit this to more reasonable values."