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just pretend the first and last pins were not there. Connect the middle 4 pins as described previously in this thread.

Hi, here a follow up on what i found out and how i fixed this problem for me. It seems the Cerbo software has lots of special "quirks" for all the "Victron-supported" batteries. SOK is not on the Victron list of supported batteries, but pretends to be a Pylontec. Not just the communications...

Hi Jan, the fuse protects the battery, the wires, the inverter, and anything else connected. Depending on how it is sized, the protection can be against short circuit, fire, electrocution (not relevant here), overload, etc. So each battery should have a fuse. They should be the same because of...

If you can rule out any external influence, such as lightning, ESD, ambient temperature, dust, moisture, liquids, etc., and bad software in the BMS; then my gues is one of the cells in #4 failed open circuit (high impedance) and the BMS didnt notice. A warning here: this is not my normal line...

I am willing to help with a German translation, if you want to do it. However i think its not worth the effort. This software is not for "Joe Average". You need to know some basics about battery technology to make any use of it. The technical terms and abbreviations are the same in any language...

Hi, the connection of the battery is to BMS.CAN. DVCC is enabled, but ignored by MultiplusII. The ESS settings are default. The software does not allow me to change them.

The Victron software has lots of additional limits and checks applied to the values from the BMS. I dont know the details, but a lot of the cerbo software is in Python, so you can look into the actual code... To view the values that get transfered from BMS to Cerbo, ssh into the Cerbo CLI, then...

If you have multiple batteries, they should be wired in a way that all batteries see the same voltage or voltage drop. That can be done with a star like wireing, if all the batteries are connected with the same type and (total) length of wire. If you connect the batteries like a stack, you...

SK48100P202209something

For AGM, this is probably nothing to worry about anyway. For Li, the important thing is, that both batteries see the same voltage. So both of your variants should be fine. Connecting charger and inverter not to the same terminals probably makes things easier, as then you can have only one...

The recommendation is to only connect together LiFePo4 batteries with the same type, model, capacity, age (some say even batch). And they should share a BMS. So if you use different types/capacities of batteries, use a separate inverter for each set. If you connect different batteries, you have...

a quick google search gave me this: https://files.bbystatic.com/CtaqKPPoReFtFnPvhwZtYQ%3D%3D/MSDS The different manufacturers more or less all use the same materials. So any safety datasheet from any manufacturer should do, e.g...

these are settings that go into the inverter. Normally the BMS tells its status to the inverter. The inverter then decides what it wants to do. The limits in the BMS act as some sort of safety-net, if the inverter tries stupid things. The inverter is supposed to normally not reach these limits...

Hi spup, thanks for at all replying. However that YT video (and all the others i have seen) is not helpful. It just says "buy the cable" and "plug it in" and everything works. SOK does not sell or ship the RS232 cable to me, does not have the pinout in the docs (and also not in YT), and it...

My SOK 48V100 Battery recently started to blink the alarm LED. Inside SOK tools, i see the error "DSG MOS fault". However the battery seems to still work fine. What does this error mean? How can i fix it? TIA Matthias

Hi, the battery is 16S cells per datasheet and per monitoring software. I did not unscrew the case for visual inspection, others on youtube did that... At the moment the battery is not charging because of this problem, so i cannot tell the actual 100% SoC voltage.

i had the same problem. The software seems to only work in an English language environment in Windows. So in Windows control panel change the language and locale to "English(US)". Then restart and the problem is gone.

Answer to 1: There are still a huge number of subsidies, both on federal, state and local level. Most of them come with some "strings attached", e.g. size limits, location limits, etc. E.g. if you go to https://www.foerderdatenbank.de/ and search for "Photovoltaik", you get currently 57...

The strange thing is, - both charge and discharge seem to work normal - the error goes away after some time, but comes back Also no arcing or uncontrolled connection/disconnection or anything like that happened. The battery is in constant operation at a Victron Multiplus-II, for months without...

Hi Dexter, the BMS reports the "Full Charge Voltage" via CAN as 56V. Victron seems to use this 56V as a maximum charge voltage and never go higher. As a result i suspect the battery will never balance as per datasheet it wants >57.6V for that. Is that the case? What is the recommended fix?

My problem is with the RS232 port. That is needed for configuration. And the pinout is not in the docs and not in the videos. Also the picture from your reply does not show any RS485 terminators. So does the SOK do automatic termination, or is the video creator just lazy?

i have no experience with this inverter, but is this the manual? https://www.solarfy.de/mediafiles/Sonstiges/WR/Axpert%20MAX%20II-manual-20210811.pdf It describes all the battery parameters meanings. You find the required numbers in the batteries datasheet, and input it via the LCD or an App...

The wire size determines multiple things: - heating and heat dissipation during normal use: depends on current and installation environment (e.g. cable in free air, in conduits, in plaster, etc.). - short circuit current: wire needs to be large enough to not overheat and to enable fast enough...

The pinout from reply #8 in this thread works for me. Depending on the manufacturing date of the battery, you have to use a matching version of the SOKTools program.

Re 1: The Victron Multiplus-II 48/3000 is used in ESS (grid tie) mode (ACin). The output above 3000W is only possible in other modes (via ACout). These are not in use. The whole system is and was never nowhere near its max capacity. Re 6: These are the settings from the vendor SOK / Current...

Some batteries want a ground connection, some dont. I do not know the exact purpose of this ground connection (EMI? electrical safety? ..?), and Pylontech does not tell it. However Pylontech does specify AWG6, which means 16mm² in metric. Pylontech also specifies max 0.1Ohm to the equipotential...

Hi eleceng1979, thanks for looking into this. The status picture is during normal (light) discharge. So at the time of the picture, the discharge MOS is supposed to be closed/conducting? However i do not know the behaviour of the BMS. The fault could be still there from something that happened...

Hi, my problem is not with discharge. That works. However the battery is never charged. Will try the changes.

i am not a hazmat guy, so i can not give you definite advice. For what i know, most countries have slightly different procedures and standards on how to handle hazmat materials. So it is probably best, if you ask some local firefighters or chemists/pharmacists for local details. You can look up...

I used a different pinout as described in this thread https://diysolarforum.com/threads/pinout-for-rs232-rj11-cable-for-sok-battery.50506/ Will test your pinout. I dont think i have any driver problems as loopback and nullmodem test works o.k.