LIFEPO4 Battery discussion thread

The battery has consistently been hitting 55.2, and the inverter stops the charge after I set the parameters as per previous discussions. This is all the while the charging from the inverter is set at 56.8V. Is this normal? I assume this is because the BMS was set by me to say 100% is 55.2V so the BMS cuts the inverter off?
 
denmendez65 said:
The battery has consistently been hitting 55.2, and the inverter stops the charge after I set the parameters as per previous discussions. This is all the while the charging from the inverter is set at 56.8V. Is this normal? I assume this is because the BMS was set by me to say 100% is 55.2V so the BMS cuts the inverter off?
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Why is it charge set to 56.8V? But yes its normal for it to cut out at the set cut out setting. What is balance looking like at 55.2V?
 
wingnut771 said:
Why is it charge set to 56.8V? But yes its normal for it to cut out at the set cut out setting. What is balance looking like at 55.2V?
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Charging is not adjustable with comms on. I need to set it to SLAvor something like that. I want to keep comms.

I will let you know tomorrow. I will be able to see the cell voltages as it gets there.
 
denmendez65 said:
Charging is not adjustable with comms on. I need to set it to SLAvor something like that. I want to keep comms.

I will let you know tomorrow. I will be able to see the cell voltages as it gets there.
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Ok, as you were, nothing to worry about. Maybe look for the 56.8V setting in BMS?
 
That’s a good point. I’ll connect again and see if I can find it. It does seem to be a setting the inverter is reading from the BMS. Didn’t think about that.
 
denmendez65 said:
View attachment 1913600

Was fortunately quick to get into the settings. Just used my friend Gemini. If I had to watch videos etc I would have given up 🤣.

@cavedog the balancing was set already to start at 3.4V. So, it seems I am balancing for quite a while everyday already, maybe some 1 hour or so. Would explain why I keep seeing improvement in the SOC each week.

The guys at Omnivolt seem to have set it up decently.
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Don’t see it here unfortunately.
 
denmendez65 said:
That’s a good point. I’ll connect again and see if I can find it. It does seem to be a setting the inverter is reading from the BMS. Didn’t think about that.
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Inverter is most definitely taking its lead from BMS settings.
 
denmendez65 said:
The battery has consistently been hitting 55.2, and the inverter stops the charge after I set the parameters as per previous discussions. This is all the while the charging from the inverter is set at 56.8V. Is this normal? I assume this is because the BMS was set by me to say 100% is 55.2V so the BMS cuts the inverter off?
Click to expand...
Why is it stopping at 55.2V when its set to 56V in BMS?
1781882546530.png
 
WillProwse actually recommends a 58v charge/bulk voltage.
 
cavedog said:
WillProwse actually recommends a 58v charge/bulk voltage.
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High voltage avoids absorb time and speeds up charging, but higher voltage also degrades chem faster. What is Wills reason for 58V? Why not 56V?
 
wingnut771 said:
Maybe the charge voltage answer is in this? Put it through your AI, I'm too lazy to watch the whole thing:
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What do you want me to ask it? I don’t get your question. Or what the purpose of the video is.

AI does say the full charge voltage triggers the BMS to tell the inverter to stop the charge hence why it stops there.
 
denmendez65 said:
What do you want me to ask it? I don’t get your question. Or what the purpose of the video is.

AI does say the full charge voltage triggers the BMS to tell the inverter to stop the charge hence why it stops there.
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Where does the charge voltage of 56.8V come from?
 
wingnut771 said:
High voltage avoids absorb time and speeds up charging, but higher voltage also degrades chem faster. What is Wills reason for 58V? Why not 56V?
Click to expand...

I don't know.


I just saw it there.

btw I agree with you but most inverters including the one @denmendez65 uses probably does not have absorption times like the Victron and so it drops to float quicker than it should causing the battery to not be fully charged.

I saw that on my inverter. That and the slight voltage difference is why I mainly set my bulk to minimum 56v and now someone suggested a cool trick with solar assistant. Use the automation to configure an absorption time. So, when battery reached 55.4v set float voltage to 55.4v for 2 hours and after that drop the voltage again. Still need to play around with it.
 
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