Frank in Thailand
making mistakes so you don't have to...
It keeps being mixed up in my brain..
Hard to let go of lead acid thinking I guess.
The average solar charge controler doesn't have only LiFePO4 settings.
They normally have lead acid (Flooded, Gel, AGM) and "User"
Some might have "lithium" as setting.
User probably will have the options for:
- boost
- absorption
- float
For 12 and 24v it's for LiFePO4 "easy" as the lithium setting will be 4 or 8 cells.
Trouble start at 48v and higher.
48v is S15 or S16.
Depending on the builder it's one of them (probably S15) or you can choose.
In my situation, having S16.. my lithium settings are for S15.
So..
"User" settings.
And that's where the confusion starts.
Please take me by the hand and tell if this is correct.
(Like I'm a 6 year old)
CC phase is the first phase.
Depending on your setup (quality of LiFePO4 cells) it can be 60 to 90% of the charge
(Normal charging is to 60%, fast is to 90% ultra fast is up to 97% SOC CC)
I guess most use fast charging.
CC is called "boost" charge.
Absorption I don't know, but overall advice is not to use for LiFePO4.
CV then should be float.
For lead acid you always set the boost on higher voltage then floating....
For LiFePO4 this should be the other way around, yes??
As boost is CC and float CV, one wants CC to get to +/-90% SOC and CV to the rest.
90% SOC is lower voltage then 95%
Where ever I look, I read peope setting their boost and float the same, or boost higher than float.
Is my understanding correct that this is a wrong setting?
That boost should be lower then floating?
Hard to let go of lead acid thinking I guess.
The average solar charge controler doesn't have only LiFePO4 settings.
They normally have lead acid (Flooded, Gel, AGM) and "User"
Some might have "lithium" as setting.
User probably will have the options for:
- boost
- absorption
- float
For 12 and 24v it's for LiFePO4 "easy" as the lithium setting will be 4 or 8 cells.
Trouble start at 48v and higher.
48v is S15 or S16.
Depending on the builder it's one of them (probably S15) or you can choose.
In my situation, having S16.. my lithium settings are for S15.
So..
"User" settings.
And that's where the confusion starts.
Please take me by the hand and tell if this is correct.
(Like I'm a 6 year old)
CC phase is the first phase.
Depending on your setup (quality of LiFePO4 cells) it can be 60 to 90% of the charge
(Normal charging is to 60%, fast is to 90% ultra fast is up to 97% SOC CC)
I guess most use fast charging.
CC is called "boost" charge.
Absorption I don't know, but overall advice is not to use for LiFePO4.
CV then should be float.
For lead acid you always set the boost on higher voltage then floating....
For LiFePO4 this should be the other way around, yes??
As boost is CC and float CV, one wants CC to get to +/-90% SOC and CV to the rest.
90% SOC is lower voltage then 95%
Where ever I look, I read peope setting their boost and float the same, or boost higher than float.
Is my understanding correct that this is a wrong setting?
That boost should be lower then floating?