Hi,
We've got a KH10 inverter with 20kWh of battery and solar panels
Until just over a week ago it was working fine - charging on cheap electricity overnight, solar during the day, and exporting during peak hours in the afternoon
At some point it started doing some odd things:
- misclassifying power - it still appears to export on the forced-discharge rule schedule, but the export shows as "load" in the app
- charging at random times - I've currently got just a single forced-charge schedule at 02:00, but it is charging to full at some random (varying by the day) point in the evening after the forced-discharge schedule runs
Our installer thought it was because I had too many schedule rules configured (I had 6, so I could control depth of discharge and height of charge by enabling/disabling rules without ever having to edit rule parameters), so now we only have 2 rules - but after a few days, I'm still seeing the same problems
Has anyone seen anything similar ?
Thanks
:craig
If you have just had a firmware update it is probable the CT clamp has become disabled so it will mis-calculate load to be the same as your PV is producing and also randomly charge and discharge depending on your schedules and whether there is PV or not.
You can check the CT settings yourself to see if the CT clamp has been disabled. At the inverter panel go into Settings (password is 0,0,0,0) then select Feature, Meter/CT and it should say CT, if it doesn’t select it and set it, the inverter will restart and should then be reading correctly.
Your installer should also be able to check that setting remotely and enable it if it has been disabled.
You can check the CT settings yourself to see if the CT clamp has been disabled. At the inverter panel go into Settings (password is 0,0,0,0) then select Feature, Meter/CT and it should say CT, if it doesn’t select it and set it, the inverter will restart and should then be reading correctly.
Your installer should also be able to check that setting remotely and enable it if it has been disabled.
Your descriptions of the issues when the CT clamp is disabled seem to be an exact match for what I'm seeing ...
but I followed through the settings on the inverter menu - it was already showing "CT" on the Meter/CT setting. Setting it again caused the inverter to restart, but it's power readings are still misclassified, so I don't think anything has changed
There's also a CT2 setting which is currently set to "Disable" - should I try enabling that ? I've no idea if we actually have a second CT clamp or whether it would be bed to enable it if we don't...
but I followed through the settings on the inverter menu - it was already showing "CT" on the Meter/CT setting. Setting it again caused the inverter to restart, but it's power readings are still misclassified, so I don't think anything has changed
There's also a CT2 setting which is currently set to "Disable" - should I try enabling that ? I've no idea if we actually have a second CT clamp or whether it would be bed to enable it if we don't...
No don’t enable CT2 that shouldn’t be on if you don’t have a second solar inverter.
It’s possible the CT clamp itself has either failed or become unclipped - you can check for being unclipped easily - have a look in your meter box, you should be seeing a CT clamp (a small square clip) clipped to the live feed from your smart meter - if in doubt post a picture here.
It’s possible the CT clamp itself has either failed or become unclipped - you can check for being unclipped easily - have a look in your meter box, you should be seeing a CT clamp (a small square clip) clipped to the live feed from your smart meter - if in doubt post a picture here.
Is this the CT clamp ?
It does seem to be clipped around the the live feed from the smart meter - so does that mean that a likely cause is that the CT clamp has failed ?
It does seem to be clipped around the the live feed from the smart meter - so does that mean that a likely cause is that the CT clamp has failed ?
Yes that’s it, and it is clipped on ok.
I can see the cable appears to have been shortened and looks like it has connectors - if your CT is not reporting the load properly I wonder if a poor connection here might be the cause, it’s a common failure point.
I can see the cable appears to have been shortened and looks like it has connectors - if your CT is not reporting the load properly I wonder if a poor connection here might be the cause, it’s a common failure point.
Hi @Dave,
Thank you for your swift assistance - it was indeed the CT clamp!
We've just had our installer out - the issue was in the connection from the inverter to the CT clamp. The inverter is installed a good 15m away from the meter cabinet, and for some reason the particular connection the CT clamp was using on the data-cable had become flakey. Switched it to one of the spare twisted-pairs in the cable and everything looks normal again
Thank you for your swift assistance - it was indeed the CT clamp!
We've just had our installer out - the issue was in the connection from the inverter to the CT clamp. The inverter is installed a good 15m away from the meter cabinet, and for some reason the particular connection the CT clamp was using on the data-cable had become flakey. Switched it to one of the spare twisted-pairs in the cable and everything looks normal again
