Ros

Do you know if it is possible to connect US3000 and AGM batteries to the same Axpert VMIII unit so that US3000 is used on a daily basis and AGM is only used as a backup power in case the grid goes out?

Question - How many Pylontech US3000 units can I connect to an Axpert VMIII?

Hi all! I am planning to add 9 x 455 watt solar panels to my VMIII and run it in SUB. The installer came to take measurements for panel fixtures. Looking at VMIII he said my AGM batteries will die soon even if using the SUB mode. Why would he say that? Is it true? I thought VMIII could mix solar and utility and work even without batteries...

I can confirm that the problem above was due to a slow step stabilizer. Basically, when the stabilizer switched to a different circuit, the inverter was able to detect this small disruption of electricity and consequently switched to battery mode. The solution I've used is to replace the step stabilizer with a modern inverter-based model, that provides continuous flow. So, to anyone out there considering to install the new VMIII behind a stabilizer - they are much quicker than the older models and this can create trouble for you.

Hi guys! I have an Axpert VMIII 5Kw. No solar, just batteries - used as a backup UPS for the house. Do you know why it shuts down on overload while in the bypass mode? Why would it care? Is there a way to stop it from rebooting on overload while in bypass? Before this model I had a 5Kw MKS and it continued to work overloaded in bypass with no issues.

The logging software does not record any anomalies before this happens - voltage and frequency are normal. My current hypothesis is that the voltage stabilizer is causing this. I have a large 12kw voltage stabilizer -it is installed on the grid input and it then feeds into the inverter. When the inverter switches from bypass to battery it (inverter) makes a clicking noise about 1 time per sec. I can also hear a clicking noise inside the stabilizer. I have now switched off the stabilizer in order to test if this remedies the strange behavior of the invertor.

Thanks for the suggestion! The inverter is actually in the USB mode and it still keeps switching to batteries several times per hour. Each time is switches to batteries for about 30 seconds and then goes back to utility. Is there a way to diagnose what could be going wrong here? 20201230_114942_Trim.mp4

@Coulomb Hi! My VMIII of-grid is setup as a backup power supply (with batteries, without PV). It switches randomly from the line mode to battery mode, even though the utility power supply is not interrupted. I thought it is supposed to go to the battery mode only if the utility power supply is interrupted. Do you know if this is a normal behavior? What could be causing these random switches to and from the battery mode?