FoxESS Community - Owners & Installers Forum

We have a new system just installed comprising 14 x 475W Aiko panels, Fox KH7, Fox EN-EPS-BOX-SP gateway for whole house EPS and EP12 battery.....when surveyed I requested an EV battery bypass to prevent the EV from being charged by the house battery & inverter......it appears this has not been fitted (I am chasing this up) so, on its first night I set the inverter to charge the new battery fully on cheap rate and about 1/2 hour later octopus intelligent go connected the EV....and it all went rather wrong....the inverter locked out due to overload and remained so even after disconnecting the EV and powering it down and up again....fortunately I managed to navigate through the menus and clear the faults which returned normal operation......so we left the EV off.
My question is HOW does the bypass circuit work as, as far as I can see, the inverter is simply paralleled across the mains so what stops the inverter charging the car
I should add that the EV is tapped off of the main consumer unit
I am quite technically minded so a technical answer is welcome
Thanks

Couple of threads about this:
viewtopic.php?p=9631#p9631
viewtopic.php?t=2886&hilit=ev+charger

Thanks, installer is supposedly coming out tomorrow to fix.....being as they did it wrong in the first place I am not confident
we shall see....and I shall report back
The CT for the inverter is on the utility supply L (1st breaker in gateway)

For you situation the EV charger needs to be on its own consumer unit with the feed taken via a Henley block between the supply isolator and Fox EPS box, this way the EV charger is completely independent from and unseen by the inverter/EPS system

As the instigator of the 2nd link nrb501 posted, I think I've learned more than a lot of installers have in this very short period.
Certainly, my EV charger installer just bunged in the charger to the nearest point in the CU. I knew nothing at the time, but he should've known that would be detrimental to the house batteries. Of course, it would have been more expensive to do it the right way, but I found a workaround in my situation (different to the OP's).

Thanks, I believe that is the plan.........and these are the professionals.....hmmmm.......annoyingly I could do all this myself but thanks to the namby pamby country we live in I'm not allowed to....I seem to have more idea than the professionals !

Building regs, Part P, competent persons... I know how you feel.

In my local area, we have a hideously expensive building notice fee for anything electrical. So for most work, it's more cost-effective to get a sparky in.
Elsewhere (2nd home location), I submitted a notice (cheap), did a full house re-wire, then got an EICR (which planning were happy with as proof of completion). Cost was 10% of what the pros were quoting. All it cost me was time (the expensive bit for a pro), materials, and a new torque screwdriver.

Best of luck with your re-install!

all done.......and co-incidentally during the testing / sign-off we had a power cut which initially threw the engineer as he was suddenly faced with no voltage from the grid and the battery was literally AT 10% so the inverter tried to power the house via the battery but couldnt because it was too low!
The PV however managed to co-erce just enough power to let it kick in so, for the first time ever we had power during the power cut
Now sorted properly with the EV supply in it's own metal C.U. on the grid side rather than the house side of the inverter

the EV CT is on the main incoming feed from the DNO fuse immediately after the meter The CT marked 2 is not in use and not connected (was run in as a spare now not needed)
The inverter CT is on the incoming supply to the Fox switchbox
presumably that is correct

That looks correct now.

edit...correct picture now attached!