Low voltage cut off and high voltage cut off

J

John Mccoy

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Joined
Jun 28, 2017
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4
Hi All

I am curious what is the nominal Low voltage cut off on lithium ion cells... and what would you advise to set your inverter to cut off voltage ?

and what safety method is advise for High voltage disconnect on charging devices AC chargers and solar charge controllers ?

John
 
jesusangel said:
Hi, read this

http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

and make your decision, I've read most of people around here charge until 4.1.
Click to expand...

I chargeto 28 v nax for my 7S pack which is 4.0 v if all the groups are perfectly balanced.

I've got a low voltage cutoff module set to 24.2 v. Thatwould be 3.45 v per group (if all the groups are perfectly balanced) but I try to reduce the load whenever my pack goes below 26 v (3.71 v per group).

Cheers, Paul
 
PaulKennett said:
jesusangel said:
Hi, read this

http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

and make your decision, I've read most of people around here charge until 4.1.
Click to expand...

I chargeto 28 v nax for my 7S pack which is 4.0 v if all the groups are perfectly balanced.

I've got a low voltage cutoff module set to 24.2 v. Thatwould be 3.45 v per group (if all the groups are perfectly balanced) but I try to reduce the load whenever my pack goes below 26 v (3.71 v per group).

Cheers, Paul
Click to expand...


I do have a similar strategy.
Please be advised that such a cycle only uses about 75% of the packs total capacity but prolongs longevity and minimizes (not eliminate!) risks of over/under charging the packs.
 
4V max and 3V min here. The minimum is just to protect going to 0. I have a soft point alot earlier.
 
I'd advise to go at 4.13V max, and 3.2V minimum.
 
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