ATS with EPS Whole House

[ziondevil]

Hi guys,

First of all congrats for this forum. Already helped me a lot

I'm finishing my home setup and have some questions.

Currently my setup is the following:

Main board (with earth rod) > Secondary board (pv/eps system is installed here). It feeds the house and the EPS is only for the secondary Board. I have passed another 16mm2 cable to the main board to connect the EPS to the Source II under the ATS. The secondary board is permanently connected to the EPS port.

On the main board i have TA10D2S0803TPE ATS with Source I Grid Source II EPS. N-L

I have notice, on the first test with the ATS, the inverter decided to make some clicking noise, like trying to stabilize, and some light flickering. Decided to stop the test

Could it be E-N bond?

Note: I have contactors in some demanding appliances in order to turn them off preventing overload of the EPS.

Specs:
Grid 13.8kw
FoxESS KH10
PV 23 x JA Solar 535W
Battery FoxESS EP11 x2

[Dave Foster]

Really could do with seeing a schematic of the system to be sure, but from what you have said, it sounds like you had an earth bonding problem when running on EPS.

Regulations will depend on the country you are in, for the UK it is illegal to be connected to the grid whilst running on EPS and you must isolate L, N & Earth from the incomer as with TN-C-S the Neutral & Earth will bonded at the supply meter and so even with just an earth left connected you will still have a grid connection.

Make sure the Neutral Earth bond is in place when running on EPS, I thought the KH did that automatically when switching to EPS but some inverters have an option to enable that feature.

[ziondevil]

IN Portugal its also forbidden like in the UK. That's why i choose this ATS because it physically disconnects N-L. Here you have your own PE . From the Power Supply (grid) you only receive N-L.

I can check under the inverter if he is doing the Neutral Earth bond. By their own manual it seems to be automatic... Perhaps i need to put the EPS directly to the ATS instead of going first on the secondary board, and then to the main board. That could be the issue.. Because if i power the main board using the secondary board (eps). The inverter will receive the N-L like it came from the grid.. But the CT detects 0 grid... The main issue is that here you don't have professionals that knows ATS, EPS... It's very very rare..