Recent content by stromy

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...

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...

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...

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...

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...

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...

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...

This charger does not seem to implement a LiFePO4 charging profile, so it is not usable for this.

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...

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...

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.

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...

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...

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...

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...