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SOLAR SUPPORT · 26-02-2023, 22:40

Quote:

Originally Posted by ers61

i'm suprised that the dally bms didnt do its work and you had to cut off the battery. normally its a good brand for a bms.

I followed the motto: "Using LFP batteries in the range of 20-80%Soc extends their life".

Passive balancing takes effect when cells exceed 3.5 vpc. Since the passive balancing method is the discharge of the cells with a small current, the balancing takes a long time to complete. I used my batteries for six months without sensitively applying the passive balancing process. After six months of use like this, the HvCutoff went down to 3.45 volts and I had no choice but to add an active balancer to the battery. The active balancer solves the balancing problem more effectively and quickly as of 3.2 vpc. I will continue with the motto "Using LFP batteries in the range of 20-80%Soc extends their life". Also I will check my capacity by doing 100%Soc from time to time.

Emmalina · 26-02-2023, 23:31

Quote:

Originally Posted by SOLAR SUPPORT

https://m.tr.aliexpress.com/item/100...gloPc2turMsite

Or this without the box ! https://www.lazada.co.th/products/ac...q3Once&stock=1

SOLAR SUPPORT · 27-02-2023, 00:42

Quote:

Originally Posted by Emmalina

Or this without the box ! https://www.lazada.co.th/products/ac...426602716.html

Are you sure it is an active balancer? Bluetooth?

ers61 · 27-02-2023, 01:49

Quote:

Originally Posted by SOLAR SUPPORT

I followed the motto: "Using LFP batteries in the range of 20-80%Soc extends their life".

Passive balancing takes effect when cells exceed 3.5 vpc. Since the passive balancing method is the discharge of the cells with a small current, the balancing takes a long time to complete. I used my batteries for six months without sensitively applying the passive balancing process. After six months of use like this, the HvCutoff went down to 3.45 volts and I had no choice but to add an active balancer to the battery. The active balancer solves the balancing problem more effectively and quickly as of 3.2 vpc. I will continue with the motto "Using LFP batteries in the range of 20-80%Soc extends their life". Also I will check my capacity by doing 100%Soc from time to time.

my system is dropin too. it's nice to be able to see the individual cell voltages and monitor them, but if it works who cares and i don't want to cut the boxes

btw, i saw you used bruteforce but could be glued from the sides?

i'm in the same motto with charging %. in the manual of my battery it is written to charge batteries with 15v !!! i never trusted these guys and was charging with much less (also not to use the full capacity) but could be like yours that they aren't getting balance threatment. i'll try. hope i won't burn them with 15v lol

SOLAR SUPPORT · 27-02-2023, 02:24

Quote:

Originally Posted by ers61

my system is dropin too. it's nice to be able to see the individual cell voltages and monitor them, but if it works who cares and i don't want to cut the boxes

btw, i saw you used bruteforce but could be glued from the sides?

i'm in the same motto with charging %. in the manual of my battery it is written to charge batteries with 15v !!! i never trusted these guys and was charging with much less (also not to use the full capacity) but could be like yours that they aren't getting balance threatment. i'll try. hope i won't burn them with 15v lol

I opened a window from the top of the sealed box by leaving pole connection side untouched. The piece of plastic panel which cut from the window is closed without sealing.

If you have a charger that works in LFP mode, try to complete the top balancing charge. If your battery voltage can reach to 14.6 volt (3.65vpc) without a bms-HvCutoff-trigger then cells in the battery are top balanced. Passive balancing becomes effective after cells voltage reach to 3.55-3.60 vpc. If the bms HvCutoff triggers at 3.50-3.60 volts or before and does not allow you to progress up to 3.65 vpc level, you may be able to solve the balance problem with small charge voltage increase settings with a 0.00 v precison charging tool. Passive balancing can continue for days, depending on the level of imbalance of the cells.

ers61 · 27-02-2023, 02:57

Quote:

Originally Posted by SOLAR SUPPORT

I opened a window from the top of the sealed box by leaving pole connection side untouched. The piece of plastic panel which cut from the window is closed without sealing.

If you have a charger that works in LFP mode, try to complete the top balancing charge. If your battery voltage can reach to 14.6 volt (3.65vpc) without a bms-HvCutoff-trigger then cells in the battery are top balanced. Passive balancing becomes effective after cells voltage reach to 3.55-3.60 vpc. If the bms HvCutoff triggers at 3.50-3.60 volts or before and does not allow you to progress up to 3.65 vpc level, you may be able to solve the balance problem with small charge voltage increase settings with a 0.00 v precison charging tool. Passive balancing can continue for days, depending on the level of imbalance of the cells.

thanks worth checking just in case..funny that while trying to enhance the life of battery it can also cause additional problems.i can adjust mptt to charge at that voltage.never went that hight but lets see..