robstrom
New Member
Any SOK owners know the default password for the app?
That's not true at all. Here are all the default parameters - they are extremely typical for LiFePO4 batteries:I suspect SOK is hiding their parameters, so you can not see it. They are using aggressive setting for max life cycles and not max capacity. To argue that they don't want you to make changes is questionable.
Yes, I was talking with SOC tech support about their balancing and it turns out it only balances during charge. With the tiny passive balance circuit, this does not give the balance circuit time to actually do the balance. The way it should work is that the balance circuit turns on as soon as one cell hits 3.4V and the cell differential is above some small value (20mv or less). The balance should then stay on till either the balance is complete or all cells are below 3.4 V.The SOK 206 has issue with balancing.
They are not hiding the settings, but they have made a business decision that they do not want customers to change them. I can understand that because some people will get it all screwed up and then expect SOK to help them fix it.... or blame SOK for problems. However, the decision comes with the consequence that they will drive away some people in the DIY space.I suspect SOK is hiding their parameters, so you can not see it.
The latest BMSs in the 12v batteries use a 33 ohm resistors, so they dissipate right around a tenth of an amp (100ma). After about 6-10 cycles, it's more than enough to bring things into line. Most BMSs only have a 20-40ma balance current.Yes, I was talking with SOC tech support about their balancing and it turns out it only balances during charge. With the tiny passive balance circuit, this does not give the balance circuit time to actually do the balance. The way it should work is that the balance circuit turns on as soon as one cell hits 3.4V and the cell differential is above some small value (20mv or less). The balance should then stay on till either the balance is complete or all cells are below 3.4 V.
The guy I talked to kinda implied they are going to fix it in firmware. When I asked about a firmware update he said the BMS does not have the capability to do field FW updates.
This was all several months ago. Hopefully newer units have the Firmware fix..... but who knows.
Last week sent them a question asking if there is a similar issue with their server-rack batteries but never heard back.
Even 100ma is not enough if the balance circuit only runs during charge. Do you know what the balance turn-on/off algorithm is for the batteries? Have they fixed the problem of the balance circuit only being on during charge?The latest BMSs in the 12v batteries use a 33 ohm resistors, so they dissipate right around a tenth of an amp. After about 6-10 cycles, it's more than enough to bring things into line. Most BMSs only have a 20-40ma balance current.
The 48v batteries use a 43 ohm, but function in the same fashion.
Give us the password then, so we can see our actual settings. SOK refuses, so is it real/edited. I seen one where they fake the info. Give us the passwordThat's not true at all. Here are all the default parameters - they are extremely typical for LiFePO4 batteries:
View attachment 133936View attachment 133937
I got the new one and it definetly work better, instead of 350mv, on original BMS, so far I manage to get it down to 110mv. However, it stop the charger CMOS is grey and when PROT State is green, then the Balance Stautus is green but doesn't do anything until internal voltage drop below 13.88 vdc. Next to the V Differ there is a new icon called Balance Status.Yes, I was talking with SOC tech support about their balancing and it turns out it only balances during charge. With the tiny passive balance circuit, this does not give the balance circuit time to actually do the balance. The way it should work is that the balance circuit turns on as soon as one cell hits 3.4V and the cell differential is above some small value (20mv or less). The balance should then stay on till either the balance is complete or all cells are below 3.4 V.
The guy I talked to kinda implied they are going to fix it in firmware. When I asked about a firmware update he said the BMS does not have the capability to do field FW updates.
This was all several months ago. Hopefully newer units have the Firmware fix..... but who knows.
Last week sent them a question asking if there is a similar issue with their server-rack batteries but never heard back.
That sounds like they may have fixed the algorithm.I got the new one and it definetly work better, instead of 350mv, on original BMS, so far I manage to get it down to 110mv. However, it stop the charger CMOS is grey and when PROT State is green, then the Balance Stautus is green but doesn't do anything until internal voltage drop below 13.88 vdc. Next to the V Differ there is a new icon called Balance Status.
It did a great job balancing from zero percent to 98 percent, then it started to drift apart. If your charger goes into Absorption 14.4 or so, the BMS shut down until Absorption end. During float at 13.8 I notice it start slowly to balance. Waiting to see if it get better than 110mv. The cell voltage is still 3.4. I like to see at least 3.45 vdc
With A grade cells? I disagree - based on the fact that the with this amount of current the batteries in the field always balance out after less than a dozen cycles. The balancers turn on above 3.4v, during charge, if cell deviation is 20mv or above. If you take a brand new battery and do an extended absorb for about 6 hours, the BMS will have balancing dialed in perfectly.Even 100ma is not enough if the balance circuit only runs during charge. Do you know what the balance turn-on/off algorithm is for the batteries? Have they fixed the problem of the balance circuit only being on during charge?
I guess we will agree to disagreeWith A grade cells? I disagree
Not the SOKs I was working with.based on the fact that the with this amount of current the batteries in the field always balance out after less than a dozen cycles.
I have not tried an extended absorb like that, but .... Once the batteries reach the absorb voltage, the current will go to near zero. If the BMS is onlyIf you take a brand new battery and do an extended absorb for about 6 hours, the BMS will have balancing dialed in perfectly.