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Right, so even if the pack without BMS has an active balancer on it, it cannot disconnect the single pack or even notice a problem. It seems the only option is to have 2 BMS...

The battery pack are bought like so and enclosed in heatshrink, there is no way for me to reconfigure it. But since the only one BMS is after the parallel connection between the two packs, it should still protect the pack without the BMS from Under/over voltage/current, temperature protection...

Yes, if I use one BMS per battery pack it will surely work, but it will be twice expensive. In the end the function of the second BMS, since the total voltage of the two battery packs will always be the same, is just to equalize the 8 cells. No I do not have a need for any special function of...

Dear Users, I was looking for a solution for many days regarding this simple problem. I have two 1200Wh 8S NCM battery packs and I am trying to wire them in parallel in order to double the capacity; the problem is that I am not sure where and when to use a BMS or an active balancer in the...

Hi everyone ! I am having troubles understanding which battery and configuration these two power station use. In particular, I am trying to understand which cell they have, I suppose ITR 26/70-40 E (3.2V 4Ah), and how many and how they are connected to each other in terms of S and P. This...

Thank you. Which buffer resistance do you think best suits my problem ? The 100W 15ohmJ is definitely too big since limits so much the current output and overheats in seconds; which size could be correct ? MPPT is the perfect answer, but I have huge space problems since the system is enclosed in...

Thank you for the answer, it is exactly as you said. The PSUs goes into (4) HICCUP CURRENT LIMITING and they keep restarting on and off whatever the Voltage and/or Current is. Unfortunately I have space problems so I cannot use a big and bulky PSU just like meanwell and other CC mode operating...

First of all I would like to thank you for the support. I took my time to receive other components and test them in order to give you a more specific answers to my problem. Just for completeness I will rewrite here my specs : Battery 24V LiFePO4, SCC PWM 30A. These are the test I made, with...

This is the resistor

This is the resistor and it is a 100W 15OhmJ wired directly on the positive cable out of the PSU. No, the solid state relay is no resistor, it has been added to avoid to burn the SCC if the BMS shuts off for whatever reason. The two PSUs have a combined voltage of 48V and tested as 47.8V; no...

There is a mistake between one of these tre components, they are all compatible, but somehow they cannot work together, can you find the problem ? First of all we have two PSU, 24V 150W 6.3A each, connected in series for a total of 48V. PSUs are then connected to a 30A PWM solar charge...

Yeah you are right ? Anyway after countless hours I was able to top balance them, the point is that now the BMS and Active Balancer keep balancing them even after hours ?

The only current settings are the ones on the BMS protection parameters page, I think... Yes it is intentional, and I chose it due to the fact that on the BMS there is written Charge Current = 40A (should I increase this ?) and Discharge Current = 80A, the BMS is a Daly 8s 80A. The SCC is a 30A...

Yes SCC is getting around 48V, but the battery is an 8s 24V LiFePO4, so it should be high enough to charge it. I have also recently discovered that adding a 100W resistance in series to the negative cable that goes from PSU to SCC does not trigger the BMS, very odd...it could be related to...

I understand, thank you very much ! In either cases I am more worried with the PSU problem rather than cell voltage

I see, maybe my charger is more suitable ? Who knows ! Are these SCC values correct for LiFePO4 ? Maybe they are the cause why BMS goes in safety mode ? I have : HVD = 29,6V high voltage disconnect HVR = 29.2V high voltage reconnect Bulk = 29V Equalize = 29V Float = 27.6V LVR = 25.6V low...

Thank you ! I will change these values as soon as possible, in either cases it do not justify why the bms goes in overvoltage/overcharge... Hope to understand why it cannot accept 150W at 48V via SCC, it is driving me mad o_O

Yes I did, they are charging but I believe there is a sort of resistance to charge because some cells remain always the same voltage for days

I have tried with both alligator clips and ring terminal but there were no difference at all. I believe that when the V diff. is so low (3.4v to 3.65v) the charger has an output limit

Tomorrow morning I will try with 300W Solar Panels instead of the PSU, but I have a feeling nothing will change...it seems like cells won't accept charge even though they are brand new, it looks like BMS cuts the charge without any reason. To parallel top charge I have hooked for three days two...

Hello everyone ! Today I had my very first big issue with my LiFePO4 battery pack, to be precise, I am unable to top balance it. First of all I connected my 8 x 52Ah LiFePo4 cells in parallel and started to top balance them with a common drone battery charger, with a normal setting of 3.65V...