LiTime Victron settings sanity check

[Drizzt321]

I've got the Victron BlueSmart 120v 12v-15a charger https://www.victronenergy.com/chargers/blue-smart-ip65-charger, and basing my read off the manual for my LiTime LFP 280Ah w/low temp https://www.litime.com/products/12v-280ah-bluetooth-battery-with-low-temp-protection, I have:

Absorption: 14.4v
Float: 13.5v
Storage: 13.2v (not really relevant)

Recondition voltage: disabled
Temperature compensation: disabled

I'm doing a full charge up before putting it into my trailer, which has SmartSolar 150/45 MPPT (peaking 30-35a solar, 400W), Orion Tr isolated 12/12-18, which I'm going to use the same Absorption & Float settings. Eventually (couple of months?) I'll be able to afford the MultiPlus 12/1200/50-16 120v (https://www.victronenergy.com/inverters-chargers/multi-500-va) which I'll use those same settings, and probably set the charge at the full 50a.

All that seems like the correct settings?

 

[mikefitz]

LiTime LFP 280Ah

Use the Victron default charge settings, 14.2 absorbtion, 13.5 float, even better once the cells have balanced 14.0 and 13.4, for normal charging.
It's very likely the battery will have unbalanced cells as delivered. With the high charging voltage the BMS will detect cell overvolts and shut down the charge path. This often results in system voltage spikes as the chargers dump energy.
To speed up the balance procedd hold the battery at 13.8 volts for several hours, evaluate, and repeat if necessary.

Storage: 13.2v (not really relevant

It's quite useful, logic suggests long term storage at or very near full cell voltage may shorten useful life.

 

[740GLE]

Enable expert mode and have it absorb for two hrs, this will help the cell balance the best they can.

My cells are nice and balanced so I don’t need to absorb at a high voltage.

Cells at 3.5v can still be 100%, so I’m not missing out “fully charging” at 14.6v.

 

[Drizzt321]

Use the Victron default charge settings, 14.2 absorbtion, 13.5 float, even better once the cells have balanced 14.0 and 13.4, for normal charging.
It's very likely the battery will have unbalanced cells as delivered. With the high charging voltage the BMS will detect cell overvolts and shut down the charge path. This often results in system voltage spikes as the chargers dump energy.
To speed up the balance procedd hold the battery at 13.8 volts for several hours, evaluate, and repeat if necessary.

It's quite useful, logic suggests long term storage at or very near full cell voltage may shorten useful life.

Unfortunately the LiTime app doesn't display cell voltages. Fortunately I have an RPi Zero 2W that I threw VenusOS onto and DBUS SerialBattery (https://github.com/mr-manuel/venus-os_dbus-serialbattery) supports BLE BMSs and has the LiTime supported, which shows the cell voltages. I have a 0.002v difference between highest and lowest cells. 2 cells at 3.350v & 2 cells at 3.348v. I suspect more time on the charger might bring them all closer to exactly the same, but with that difference I'm not worried in the slightest right now.

So LiTime manual suggest 14.2-14.6v for charging, why I chose 14.4v

For Solar, it likewise suggestes 14.2-14.6v charge/absorption voltage.

EDIT: Interesting, through the VenusOS, I'm seeing "Installed/Available capacity" of 294Ah/291Ah, so I wonder if they somehow snuck in 290Ah cells into their 280Ah batteries and just didn't relabel. Interesting. I don't have anything to do a battery capacity test to know if that's actually my capacity. That'd be a nice bonus, but based on Will's reviews and opening of various recent LiTime batteries, I'll assume I have 280Ah (maybe a few Ah over for new cells), so good enough.