Daly and Victron set-up advice for Lifepo4 ?

onrbikes · Apr 6, 2024

I've just installed a 24v x 200ah lifepo4 (self build) after years of lead acid. I've been offgrid for over 20 years and only use about 1kw per day. Not a typo, It's a well designed house.
I have plenty of solar charge.
A friend who is knows lifepo4 has balanced the batteries before installing, but isn't experienced with the victron set-up.

I've got a victron easysolar with a victron smart shunt and Daly bms. After 2 weeks usage, everything seems to be working fine but am fumbling around not really understanding what I'm looking at.
Lead acid always seemed to be doing something.

After reading many threads on this forum have set the system up to what I think is correct

I've attached a lot if screen shots and asking if these numbers look OK?
Any thoughts?

Thanks.

Jalle19 · Apr 7, 2024

"cell volt low protect" and "sum volt low protect are set way too high, I would change them to 2.5V and 20V respectively.

I suggest having a look at various "best practice" values for LFP batteries and change your BMS protection and charging settings to match those.

onrbikes · Apr 7, 2024

Thanks.
I would've thought 2.5volt way below any safe voltage.
Does that mean the system shuts down when it hits 20 volts?

Jalle19 · Apr 8, 2024

Pretty much, yes. The limit set in the BMS is the ultimate limit, but before you reach that there's an "inverter cutoff" limit in your EasySolar that usually gets hit first. It's not clear from your screenshots what it's set at, you need to use VEConfigure to set it.

rustyrotors · Apr 8, 2024

i just copied my amperetime battery settings, which the battery cuts off at 2.7V and shuts down at 2.6V. i think on the daly the battery will not turn back on automatically, so you really dont want to hit that limit if all possible. so set your inverter to standby at higher voltage than the battery, like 3V (24V) and system should recover automatically

i read a white paper somewhere that showed lifepo4 cells actually have the least amount of degradation at low states of charge, so there is no harm from low 2.x cutoff voltages. it is only if you get below 2.0V/cell that causes irreversible damage.

Daly and Victron set-up advice for Lifepo4 ?

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