Fox CT Clamp potion Question re stats
Posted: Thu Jun 11, 2026 3:42 pm
Hi
Need some advice, I have had a change to the installation by the installers, see enclosed photo. They have installed a new MCB top right of photo black/grey box with Blue/Brown cables which is the feed from the inverter connected into the two brown connecters.
The Brown and Blue cable on the far right is the new installation, and the feed from the Fox System
The White box is the feed from the mains to my Easee Car Charger, which has an equaliser on it, which is set not to use solar or batteries.
The Meter is as can be seen
Consumer unit on the left.
The Clamp from Fox is the White Clamp which they placed on the mains cable coming from the main supply into the meter.
The second black clamp goes to the Easee Equaliser, as it needs to see the exported energy should I want to use it to charge the car.
I have my car charger set to charge from 00:40 - 05:30 under Octopus Go. Now when I check the stats, second photo shows stats. I see that at 00:40 when the car is set to start charge, I see that the battery is discharging for 20 mins, it then stops and the rest of the charge continues as grid import. Question is this normal behaviour, I checked using AI from Co-Pilot and it appears to be working as desired with the inverter. The following is what came from AI. From anybody's knowledge is the statement below correct.
The Fox inverter initially tries to offset all load
For the first few minutes, the inverter sees:
House load
EV charger load
Total load = high
And because the CT clamp is now correctly placed as per the enclosed photo , the inverter thinks:
“I should discharge the battery to reduce grid import.”
So it tries to help — but the Car Charger an Easee charger with an Equaliser blocks it.
4. After ~20 minutes, the inverter realises it cannot offset the EV charger
Fox systems have a built‑in “grid import stabilisation” logic:
If the inverter tries to offset a load but the load does not reduce
It assumes the load is non‑offsettable (like an EV charger or immersion heater)
It stops trying
It switches to idle and lets the grid supply that load
This is why the battery stops discharging after ~20 minutes.
Thanks
Need some advice, I have had a change to the installation by the installers, see enclosed photo. They have installed a new MCB top right of photo black/grey box with Blue/Brown cables which is the feed from the inverter connected into the two brown connecters.
The Brown and Blue cable on the far right is the new installation, and the feed from the Fox System
The White box is the feed from the mains to my Easee Car Charger, which has an equaliser on it, which is set not to use solar or batteries.
The Meter is as can be seen
Consumer unit on the left.
The Clamp from Fox is the White Clamp which they placed on the mains cable coming from the main supply into the meter.
The second black clamp goes to the Easee Equaliser, as it needs to see the exported energy should I want to use it to charge the car.
I have my car charger set to charge from 00:40 - 05:30 under Octopus Go. Now when I check the stats, second photo shows stats. I see that at 00:40 when the car is set to start charge, I see that the battery is discharging for 20 mins, it then stops and the rest of the charge continues as grid import. Question is this normal behaviour, I checked using AI from Co-Pilot and it appears to be working as desired with the inverter. The following is what came from AI. From anybody's knowledge is the statement below correct.
The Fox inverter initially tries to offset all load
For the first few minutes, the inverter sees:
House load
EV charger load
Total load = high
And because the CT clamp is now correctly placed as per the enclosed photo , the inverter thinks:
“I should discharge the battery to reduce grid import.”
So it tries to help — but the Car Charger an Easee charger with an Equaliser blocks it.
4. After ~20 minutes, the inverter realises it cannot offset the EV charger
Fox systems have a built‑in “grid import stabilisation” logic:
If the inverter tries to offset a load but the load does not reduce
It assumes the load is non‑offsettable (like an EV charger or immersion heater)
It stops trying
It switches to idle and lets the grid supply that load
This is why the battery stops discharging after ~20 minutes.
Thanks