I think your batteries are dead. Have you put a charge to them over a long period of time. My batteries came to me dead and had to put a long charge on them to wake the BMS

Yes...The batteries are/were dead. The issue is/has been getting them to accept a charge. After two YouTube videos on how to bypass the BMS and get enough charge in so the BMS will wake up I finally got them to start charging from a charger. Talk about a pain. Thanks for the reply. I appreciate it.

If you keep having issues with the BMS... you might have a older version which has been upgraded. But they will only replace it if your current version fails continuously

you could contact us for BMS replacement.

please drop an email to sales@sokbattery.com , if not working, we will do replacements for you.

There is a setting in the basic, where you can change 300 min to 999 or 0. The bluetooth goes to sleep and it will wake up when charging or discharging. This may only work with V3 version of the BMS. (Dumbist BMS ever)

Try separating your parrell batteries and see how they charge. In case there is an issue with one battery. Check your connection, lose connectors.

Usually, you need to fully charge before you get SOC results.

SOK seem to tell everyone to fully discharge the battery and then recharge when you first get it. If you skip this step, you may want to do that with each battery. Your wrong cycle may get corrected too.

The bms shut down early, so you need to keep a discharge until you lose bluetooth connection. You may also end up having to go through waking up a shut down bms. Victron charger can do or hook up for a few second to a charge battery of same voltage.

Total nuisance I agree....

Look like you have the old bms, total junk, get it replaced under warranty or return it. The V3 version has an additional box next to V Differ, called Balance Status.....

Also, check what version app you have. If it an old one, hang on to it, so you may be able to access the parameter list. The updated app, has new password that SOK is not giving out. Even dealer refuse to give it, as I know they have it.

Update. Received new version of BMS and all is working 4.0!

SOK is quickly looking to be a fly by night company. Quite disappointing...

1st: They push a product with BMS specs that don't match what they published.

2nd: They provide a mostly non-functional app.

3rd: They block accessibility to the few functions that did work in the app.

4th: They provide no useful support to their customers.

5th: Apparently their vendors receive no better treatment or support.

We are having difficulties getting answers like most folks. Yes, it's disappointing. Showing all this functionality in an app while most of it is either unaccesssible or without any explanation/documentation does not bode well

As a dealer you should be able to get password, so you can verify parameter are not scrambled. I had to do a Reset option with the V3 bms that I installed on mine. Won't hurt, as far as I know it reset to factory parameters.

If you don't see Balance Status Box next to V Differ box than you have an older BMS and shoud have it replaced under warranty.

You wouldn't want to sale these to your clients. For example if I bought this from you and found out the issue, you would lose me as a customer and I would make it public. What more important for you????

In the basic there is a sleep time, default is 300 min, If it goes to sleep, you can only wake it up if putting a load or charge on it. I set mine to 9999 for now. Some have complained they couldn't wake up batteries. Not knowing the details, can't help.

The 3500 cycles should be a software bug, incorrect.

Yes, thanks Joshua. I tried quite a few variations. Frustrating. Perhaps I'll hear back from SOK contact form. I asked there too or someone else here has uncovered the new passwords.

🤞🏻I haven't had any return contact luck. Hopefully you get something.

Did anyone ever track down this parameter settings passcode?

Did anyone ever track down this parameter settings passcode?

Joshua Lee7h

Replying toJoshua Lee No passcode. They will not share it and state it is for manufacturer use only. You can install an old app version and use the old passcode of 200810 if needed. It's funny because they have a YouTube video for how to replace a BMS, but somehow parameters are guarded.

It a cover story, they know they have a serious problem and they are hiding the issues. V3 version help a bit, but still can not at least once exceed 14 vdc to saturate the batteries at least once. One reason why many are finding their batteries not lasting. Just because a cell is reading 3.4 or so vdc, means nothing to SOC being 100%, it could be 20% or somewhere in between. Once you saturate the cell to 3.65 for each cell, then you have 100%, and when the cell drop to 3.45 you still between 99 to 100%, Any other way, false and misleading charge.

I suspect you have the older BMS, totally useless. Request V3 version or better under warranty or return the unit as defective, non functional.

The password is 200010

Hi, just in case someone comes across this same problem. After many attempts of trying to charge the batteries with different settings, it turned out it was a problem with the BMS which had to be replaced. The product is generally of good quality, but SOK really need to fix these problems.

You have an older BMS, need V3 version, request new BMS or return it. Unfortunately, the V3 work way better in that it bring the balancer close 20mv with lots of playing with it. But you can not saturate the cell even once. Total cell voltage should hit at least 14.6 once, if not, then your SOC charge can be anywhere from 20 to 80 percent. Only after hitting 14.6, then you know you got 100%, even when cell drop back to 13.8.

If off grid, the heater pad will not come on. If you are on grid, then the BMS should turn on the heater. Unless you don't have the heated pad version. Check SFK site, they sell a heated pad bag.

No heater, and in the RV not enough power to use one.

SFK also has a switch that allow you to manually turn on heater even when off grid. They do sell battery with those options, like the SFK 300HP. Switch can be bought, but you would need to be able to set it up yourself.

There is a video online that demonstrate that and how little power it uses, expecially when you put it in a heated bag.

The heated bag is 12vdc and not ac, if I recall, so it should work for you.

C MOS and D MOS normally is green, meaning it can charge or discharge. When on goes grey then it a no.

PROT State & Heating Status normally is grey, the opposite of above. Stupid to me, but then what can u expect.

PROT State when turn green, a cell hit 3.65, it stop charging your cells. It won't restart unitl the cell drop to 3.5xx or something like that.

If your battery drop to freezing the Heating Status will go Green, you will not be able to charge. If you are hook up to shore power with a charging system, then the heating pad will come on, otherwise nil until battery warm up.

You can make your own heating pad or buy one from SFK, it draw power from the battery.