Jakiper 48v (Sok too?) Pace bms can balance cells when not charging
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- เผยแพร่เมื่อ 10 ธ.ค. 2024
- My Jakiper battery has had wide cell differential unbalance from the beginning. Jakiper techs said to let it go to OVP overvolt protection but never explained why. Now that I have it on the bench with a regulated power supply I have found that it will balance when it is not charging as long as it went into OVP first. It may take a long time with only around 50 to 75 ma passive balance bypass. I showed in this video how the software shows the balancing. Andy at Off Grid Garage also made video analyzing the Pace bms so look that up on his youtube channel.
Thank you very much for the instructions. I was wondering, incase the operational BMS is accidentally damaged, what will be the safety mechanism for the battery pack system. Will the system be cut-off or the battery charge-discharge can be continued somehow?
For discharge there should be a fuse or a breaker that would limit the amount of current going through the cables to the loads.
Otherwise you have to trust that the bms is properly designed to not fail in a shorted state. I have not heard of bms failing in that way . That is one reason to make sure to use a known good quality bms.
For charging the battery there is also the charge controller that would also be some protection.
Hi Larry,
Can you share more abt the connection cable to rs232 port on the battery ? i saw andy off grid uses RS485 port to monitor and change setting.
For RS232 port If you use usb to serial port adapter with a DB9 on it - you only need three wires on pins 2 , 3 , and 5 of the DB9 . If using 6 pin RJ12 then connect pin 3 of that to pin 2 of DB9,
pin 4 to pin 3
pin 5 to pin 5
They show the rs232 jack pins in the Jakiper battery manual.
how did it all end? when did the OVP stop and the battery went back to its normal mode? is the battery balanced now?
No , the bms doesn't have enough capacity to balance the cells. I got one of the Neey balancers and have that hooked up and it does the balancing . I have a video that I made about that and should post it.
Great video, thanks. I am trying to balance the svolt bat. with pace bms (which we bought recently) cells in the same way, but one of the cells deviate by +-100mV, I guess it will take months to balance. So far I see no difference in the unbalanced cell voltage after recycling the bat. about 10 times and force the bms into ovp by setting voltage at 3.7v to trigger ovp.
Do you perhaps have the pinout of the rj11 to 9pin rs232 cable? , I would like to try out pbms.
May i ask what current the pace bms was balancing at? And what current did the subsequent neee balance at? Thanks
@@gssrustenburg The pace bms will keep balancing after it goes into OVP . What you could try to do is lower the cell balance threshold to 3.45 per cell and 20 mv differential. Then lower the cell OVP to something like 56 and recover to 55.1 . That will force the balance to work at lower point and cycle the charging on and off more often. Ideally you would put the battery on a charger that would provide only a low current of a couple amps and leave it that way for a number of days. But that may not be practical if you need to use that battery. The other option is to open up the battery and manually charge and discharge cells until you get them more in line. Off Grid Garage on youtube showed how to do this but you do need to use the software to be able to monitor the cell voltages as you do this.
@@WEIMERANERZ The Pace only balance around 100mv or so I think and that isn't much. The Neey will balance at 4 amps though one cell at a time but is very effective at doing this. Watch Off Grid Garage on TH-cam - he did detail on a few different Jakiper Batteries and their Pace BMS functions.
Hi Larry, I have run into a problem which I cant fix . My inverter is a MPP Solar 5048MGX and my battery is Chinese brand Sunwise. The battery has a Pace 48V 150A 15S BMS. I have found the correct pbms tool to change the protocol but it won’t change it “Fault”, I have also used the other pbms tools programme to access the settings and tried resetting it in the “System config” section, but that doesn’t work either “Fault”. It also states “Fault” when I want it to read the info! . The protocol is set to “Paceic” I need to change it to Pylontech as the Inverter has the pylon option. Any Ideas? Much appreciated.
I thing some of the older pace bms you could not change the protocol for inverters. I don't have any experience with that type of inverter going to a battery. Are you sure your cable from battery to inverter is correct ? I remember reading in a Jakiper post that the pace program would change the protocol but that it wouldn't show that it had done it. Look in Jakiper facebook group or for blog posts on Orient Power.
If it is important for you to get them communicating you may just have to replace the bms with something like a JKBMS which might swap in easily if connectors are the same. Look at Off Grid Garage video - he changed a Pace bms in Jakiper with a JKBMS.
@@LarryKapp1 Hi Larry Thank you for your response, I am waiting for an answer from the manufacturer, Fingers crossed. I am going to investigate and make sure I have the correct lead as well before doing any major surgery! Thanks again!
Hello there, what kind of program is it?
Can you give me link for downloading please.
Many thanks.
Not sure if I can put in a link here but look up ClassicDIY /PylonToMQTT on Github and look at the wiki that gives full install instructions. I will post the link in another reply.
github.com/ClassicDIY/PylonToMQTT
Interesting behaviour. It is still not clear why not to do a constantly working balancing
Not sure your question but the pace bms will only keep balancing after charge if a cell goes into over volt protection OVP.