KH10.5 using meter (not CT) losing feed
Posted: Tue May 12, 2026 10:36 am
Hello!
KH10.5 Master 1.60 / Manager 1.58 / Slave 1.02
Have batteries and solar.
I changed from using the CT clamp to using an Eastron power meter which works great. Except when it doesn't.
I have all-too-often lately had either a real or perceived (by the inverter) brief power loss around 7am (grid fault errors in log). Voltage graph (seen in Home Assistant via Waveshare modbus) for example will show a drop to about 50 volts for about 10 seconds. That's fine, we go to UPS and no one would notice. But when voltage/freq returns to normal, the inverter will sometimes lose the ability to get readings from the meter, so it has no idea the power flow to/from the grid. This causes problems of course with balancing correctly.
If I look at the Eastron meter front panel it is showing correct power flow, so the problem is the Inverter loses connection to it and can't restore it.
May be related to the fact that, with my original firmware that I can recall, any time there was a switch to UPS mode, when the inverter returned to normal it would cycle through a checking routine (can hear inverter clicking). But after some firmware version upgrade I received some months or years ago, it would return to online state right away without checking.
Today my only solution to get the meter reading correctly was a full power down and back up again. Other times I have been able to fix it just by turning the incoming AC supply breaker off for a few seconds then back on again.
Thoughts? Ideas? Can I have both the CT and the Meter installed where the CT works as kind of a backup? Has firmware newer than 1.58 changed this problem I'm having?
I see change log for Master v1.60 (which I have) says in part "The interruption time has been optimized to resolve communication abnormalities." Am I still having communication abnormalities with the meter, or does that refer to something else?
Thanks.
KH10.5 Master 1.60 / Manager 1.58 / Slave 1.02
Have batteries and solar.
I changed from using the CT clamp to using an Eastron power meter which works great. Except when it doesn't.
I have all-too-often lately had either a real or perceived (by the inverter) brief power loss around 7am (grid fault errors in log). Voltage graph (seen in Home Assistant via Waveshare modbus) for example will show a drop to about 50 volts for about 10 seconds. That's fine, we go to UPS and no one would notice. But when voltage/freq returns to normal, the inverter will sometimes lose the ability to get readings from the meter, so it has no idea the power flow to/from the grid. This causes problems of course with balancing correctly.
If I look at the Eastron meter front panel it is showing correct power flow, so the problem is the Inverter loses connection to it and can't restore it.
May be related to the fact that, with my original firmware that I can recall, any time there was a switch to UPS mode, when the inverter returned to normal it would cycle through a checking routine (can hear inverter clicking). But after some firmware version upgrade I received some months or years ago, it would return to online state right away without checking.
Today my only solution to get the meter reading correctly was a full power down and back up again. Other times I have been able to fix it just by turning the incoming AC supply breaker off for a few seconds then back on again.
Thoughts? Ideas? Can I have both the CT and the Meter installed where the CT works as kind of a backup? Has firmware newer than 1.58 changed this problem I'm having?
I see change log for Master v1.60 (which I have) says in part "The interruption time has been optimized to resolve communication abnormalities." Am I still having communication abnormalities with the meter, or does that refer to something else?
Thanks.