Hi,

I was wondering if someone could perhaps give me some assistance/guidance. 

I bought an Axpert King 5KW inverter and a Pylontech US3000C Battery as a backup/UPS system for when loadshedding strikes. After a few different forum topic (thanks everyone) I managed to get the setup completed and all seems to be working well except for one thing:

Whenever I am running on Utility power and there is no cut off it seems as though when the battery is at 100% full it seems to use the battery for a while and then switch back as both the battery and inverter show that they are charging again. I would have though that once the battery is at 100% that it would stop charging altogether but this is not the case as on the inverter is constantly shows its trying to charge the battery.

The only setting I changed was 05 set to PYL

Also the cable between the battery and inverter does seem to be working as the battery icon on the inverter is flashing in and out. I connected it via the RS485 port on the battery.

Is it normal behavior to be in a "constant" state of charge? and if so wont that affect the battery life cycle?  

6 hours ago, mikeuser said:

Is it normal behavior to be in a "constant" state of charge? and if so wont that affect the battery life cycle?

It's not really "normal" behaviour in the sense that a properly designed system should not do this.

It IS normal in the sense that all the Axperts with the comms cable to the BMS at present seem to do this; it's a known issue. I have no idea if Voltronic believe it to be a problem, and if so whether they intend to fix it, and if so when.

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so wont that affect the battery life cycle?

It must have some effect. My guess is that the effect will be small, so even if Voltronic know about it, they probably don't think it's worth worrying about.

Is it small enough not to worry about? I really don't know.

If you're really concerned about it, it is possible to use a monitoring computer running software like ICC or Solar Assistant, which talks to the BMS, and hopefully isn't so bone headed. I have never used one of these BMS equipped battery modules or these monitoring computers, so I don't know if using them avoids this problem. But they seem to be infinitely more approachable than Voltronic for getting issues such as this addressed.