Hi fellas
In short: what's your settings and why?
Please be elaborate and include all settings possible (abs, float, storage, recondition, re-bulk current/voltage, abs/recondition duration/time, etc.)
The longer version:
I know there is a ton of knowledge on this subject out there, but as a result of that I am now confused.
I would very much appreciate if we could try to summon some knowledge and experiences
Will Prowse is recommending abs 14.5, float 13.6 (says nothing about absorbtion time, tail current, re-bulk etc)
Andy from off-grid garage is recommending abs 13.6, float 13.6 and 0.1v offset (re-bulk at 13.5)
Some say that float voltage is supposed to be off completely when using lithium chemistry?
TheWilltoBuild says that it doesn't make sense to charge higher than 3.35 per cell
These different recommendations are vastly different - which is correct for what sort of use?
Feel free to just share your recommended preset and why you choose those settings - perhaps a screen dump to include all the expert settings as well.
My situation:
I have a 460Ah battery (2p4s, 8x230Ah EVE fixated) in my van that I live in.
Most of all it's important for me not to stress the batteries more than needed, but during winter I'd like to charge to almost full capacity, to make it through periods of little sun.
On my victron blue smart 25A I tried setting the absorbtion to a conservative 13.4v, since I hear there is not much power to gain above 3.35v per cell, but this made charging a very lenghthy process, since it almost always goes in absorbtion after short time, and then ends absorbtion after 2h time
I tried raising the voltage to 13.6v while I was fiddling with some settings, which meant that the standart lithium preset of 2h limited absorbtion got reset a few times, and the batteries was kept in absorbtion for maybe 8 hours (+ the initial bulk phase of ish 2 hours), and was still pulling 5A at the time the charger cut off. So I wonder how many Ah the batteries could still charge, if I just let it sit in absorbtion?
After the charger ended the absorbtion phase the voltage in the batteries settled at 13.35. Why did the voltage drop this much?
Some random questions:
What's the difference between longer absorbtion time at lower voltage (13.6), rather than short/no absorbtion time at a higher charge rate (14.5)
Does it hurt lifepo4 batteries to stay in absorbtion for too long, low or high voltage?
Why do some use float and others not?
I turned off float - how does my charger decide
Can you overcharge a lifepo4 battery at a lower voltage (13.6)?.. by leaving it in absorbtion for too long? Or can you only overcharge at a higher voltage (above 14.5)
My system:
BMS: one Daly 150A
Victron smart shunt
Solar charge controller: Lumiax Win-MPPT 20A
Charger: Victron blue smart ip67 25A
DC-DC: Renogy 40A
In short: what's your settings and why?
Please be elaborate and include all settings possible (abs, float, storage, recondition, re-bulk current/voltage, abs/recondition duration/time, etc.)
The longer version:
I know there is a ton of knowledge on this subject out there, but as a result of that I am now confused.
I would very much appreciate if we could try to summon some knowledge and experiences
Will Prowse is recommending abs 14.5, float 13.6 (says nothing about absorbtion time, tail current, re-bulk etc)
Andy from off-grid garage is recommending abs 13.6, float 13.6 and 0.1v offset (re-bulk at 13.5)
Some say that float voltage is supposed to be off completely when using lithium chemistry?
TheWilltoBuild says that it doesn't make sense to charge higher than 3.35 per cell
These different recommendations are vastly different - which is correct for what sort of use?
Feel free to just share your recommended preset and why you choose those settings - perhaps a screen dump to include all the expert settings as well.
My situation:
I have a 460Ah battery (2p4s, 8x230Ah EVE fixated) in my van that I live in.
Most of all it's important for me not to stress the batteries more than needed, but during winter I'd like to charge to almost full capacity, to make it through periods of little sun.
On my victron blue smart 25A I tried setting the absorbtion to a conservative 13.4v, since I hear there is not much power to gain above 3.35v per cell, but this made charging a very lenghthy process, since it almost always goes in absorbtion after short time, and then ends absorbtion after 2h time
I tried raising the voltage to 13.6v while I was fiddling with some settings, which meant that the standart lithium preset of 2h limited absorbtion got reset a few times, and the batteries was kept in absorbtion for maybe 8 hours (+ the initial bulk phase of ish 2 hours), and was still pulling 5A at the time the charger cut off. So I wonder how many Ah the batteries could still charge, if I just let it sit in absorbtion?
After the charger ended the absorbtion phase the voltage in the batteries settled at 13.35. Why did the voltage drop this much?
Some random questions:
What's the difference between longer absorbtion time at lower voltage (13.6), rather than short/no absorbtion time at a higher charge rate (14.5)
Does it hurt lifepo4 batteries to stay in absorbtion for too long, low or high voltage?
Why do some use float and others not?
I turned off float - how does my charger decide
Can you overcharge a lifepo4 battery at a lower voltage (13.6)?.. by leaving it in absorbtion for too long? Or can you only overcharge at a higher voltage (above 14.5)
My system:
BMS: one Daly 150A
Victron smart shunt
Solar charge controller: Lumiax Win-MPPT 20A
Charger: Victron blue smart ip67 25A
DC-DC: Renogy 40A