Li-Time over-voltage cutoff at 13.9 volts

Crowz · Dec 5, 2023

mberding said:
OK, that sounds pretty much like what I'm doing right now with my desktop charger. I can set it to exactly whatever voltage I want and tinker as needed.

And I've already been doing the "fun part", trying to figure out how high I can set the voltage without having it trip into over-voltage protection. Right now I think I'm at 13.86 volts or so. Going to go out to the shed later tonight and check on it.

I wouldn't "strive" for raising the volts as high as possible. Something like 13.5 is where I would strive for if it was me. You want the cells around 3.35 or a bit higher from my understanding. Your not trying to charge the battery your trying to bring up the weak cells so they can catch up with the full ones.

Your overvolt problems are from some of the cells being full not the entire battery being full.

mberding · Dec 5, 2023

Crowz said:
I wouldn't "strive" for raising the volts as high as possible. Something like 13.5 is where I would strive for if it was me. You want the cells around 3.35 or a bit higher from my understanding. Your not trying to charge the battery your trying to bring up the weak cells so they can catch up with the full ones.

Without the bluetooth BMS, I'm guessing at what the voltage is where it'll start balancing. And is that single-cell voltage, or minimum cell voltage? No way to know since it's a sealed black box.

So in your opinion -- how long do you think it'll take to balance out one or more cells in a 12v system if I leave it at 13.8-ish volts?

mberding · Dec 5, 2023

Crowz said:
Your overvolt problems are from some of the cells being full not the entire battery being full.

Yep, I know. I'm just being impatient with this battery because I was expecting it to be fully functional when I bought it instead of needing babysitting and an extended install process.

Crowz · Dec 5, 2023

Well on my 48v battery it took about 3 days to get close. After a week it was dead on.

That said that particular battery is being used as a glorified ups since I just use the battery when the power goes out so it was an easy run on that

Crowz · Dec 5, 2023

The 12v stuff was even easier since it was discharged each day to a set limit and recharged. It caught up on its own. I just kept the "full" point low enough to keep it from getting to high till it had time to settle in.

mberding · Dec 10, 2023

Update for any that are watching: Did a test yesterday after holding at 13.6-ish for a couple days. Instead of hitting OVP at 13.9, they're now at 14.2. Going to leave it balancing for another couple days (or more?), really hoping for a OVP of 14.4 or better.

Robar · Dec 22, 2023

I just posted to a similar thread with some info directly from Litime and thought I would share here as well:

Trouble Charging LiTime TM Batteries

I bought three new Li Time 230Ah Plus with LTCP and am having exactly the same experience as you describe. All of them arrive with a voltage around 13.11v. I charge with a Victron IP22 30A charger, and when it completes the cycle, the battery reads 12.89v or 12.96v ----this has been the case...

diysolarforum.com

@mberding have you had any more luck with the balancing effort? I'm planning to try the same with mine after I get back from traveling.

Li-Time over-voltage cutoff at 13.9 volts

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Trouble Charging LiTime TM Batteries

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