Stopping Car Charger from using House Battery (Again)

[siobhanellis]

Sorry the image is rotated by 90 degrees, but this is my board.

I have the problem that the car can charge off the battery and, obviously I don't want that.

You can see the CT clamp from the solar just above the main fuse (Or in the rotated image, it's the small white cube to the left of where either says "Solar PV on roof".) It is clamped around the live wire which then goes into the mains meter.

Everything works find except that the EV charger can, at times, pull from the battery.

The EV CT Clamp is just below the meter (Or in 90 rotated image, just to the right of the meter) and is a small black cube and connected to the live and goes into a Henley Block where it is joined by the Live from the Inverter.
The Neutral from th meter also goes into a Henley Block where it is joined by the Neutral from the Inverter.

On the other side of the Henley block are two outputs:

1. Goes to the EV Charger
2. Goes to the House distribution Boards (I have two, so that output is split by more Henley Blocks.

Everything I've read says the EV Charger clamp is in the correct place, and that I need to move the Inverter CT clamp to the live output into the distribution boards below the Henley Block, so it no longer measures the power being used by the EV Charger. However, when I do this I get very strange readings in the FoxESS app.

Any ideas?

thanks

[Will]

Try moving to the green dot with the arrow point up, wait 5mins for the inverter data to update and then try a test charge and see if if the fox system covers the load but not the car charging.
If that doesn't work move to the red dot with the arrow pointing down and retest.

[siobhanellis]

Thanks for the reply.

Neither works.

Not moving anything, I get the following:

load: 1.31kw
pv: 0.17kw
grid: 19w
batt: 1.22kw

when I try option green, I get:

load: 7.22kw
pv: 0.18kw
grid: 2.23kw
batt: 5kw

when I try option Red, I get:

load: 0w
pv: 0.13kw
grid: 0.12kw
batt: 18w

about the only thing that is consistent is the pv.

Any thoughts?

[Will]

You might need to go back to your installer to investigate.