Confirming information for new battery

[Ampster]

Yes CC is constant current = Bulk
CV is constant voltage = Absorb.
In constant voltage
phase you should see the Amps begin to taper off. Some charge controllers have a timed setting for that phase or a minimum Amps where the charging stops.

[Hosinfefer]

Yes CC is constant current = Bulk
CV is constant voltage = Absorb.
In constant voltage
phase you should see the Amps begin to taper off. Some charge controllers have a timed setting for that phase or a minimum Amps where the charging stops.

Ok so based on your previous post Ampster a safe "max" charge of 13.8C (3.45V\Cell). So set the bulk up to like 13.5? then slow Absorb it up to 13.8?

[Hosinfefer]

or maybe just safe to follow the settings from this site on how to set the specs for LFP battery.

https://www.solacity.com/how-to-keep-lifepo4-lithium-ion-batteries-happy/

[Ampster]

Ok so based on your previous post Ampster a safe "max" charge of 13.8C (3.45V\Cell). So set the bulk up to like 13.5? then slow Absorb it up to 13.8?

I would go to 13.8 with Bulk. When it hits that voltage it will switch to constant voltage (Absorb) and then you set the timing or the minimum Amps to end the constant voltage phase. That way you get max current until your set point. Some of that may depend on when your BMS starts balancing.

That link uses more aggressive voltage that I would but it is a judgment call and both are conservative numbers.

[Mike90250]

Most controllers, the Bulk and Absorb voltages are the same, and when the voltage is reached, the timer for Absorb starts counting .

After the timer finishes, controllers transition to the FLOAT mode which is often a slightly lower voltage..

[Ampster]

Most controllers, the Bulk and Absorb voltages are the same, and when the voltage is reached, the timer for Absorb starts counting .

After the timer finishes, controllers transition to the FLOAT mode which is often a slightly lower voltage..

Thanks for confirming that. In this case he is going to disable Float as recommended for LFP.

[Mike90250]

I've got no idea how he's going to configure/program his controller. All we can do is advise. FLOAT can't really be disabled, but can be set to a low enough voltage the cells won't continue charging, and if loads come online, the controller will power 90% of the load. But that requires reading, comprehending and implementing the recommended settings from the Mfg, who is in charge of the warranty.

[Hosinfefer]

well I will contact Ep and see what they say about the controller and the charge settings. Didn't think it would be this hard to find correct charging parameters, but you live and learn I guess.

[Hosinfefer]

so EP does nto support LIFEPO4 with that BN series controller...they suggest I buy a new one. So i went with a victron controller that supports LIFEPO4 battery native.