Instruction from electrician for EPS: switch off grid isolator (1) + switch on EPS switch (2) + switch off DP in New mini CU, and then EPS works. I tested it by switching off isolator next to the meter.marshman wrote: ↑Mon Nov 07, 2022 10:44 am Can you sketch an actual wiring diagram showing the incoming main, old consumer unit with feed to the inverter and also wiring to the new "mini" consumer unit? I ask because from my interpretation of your description it seems the new "mini" C.U. is connected to the EPS output of the inverter via the MCB, but the C.U. is also connected to the grid via the main switch and the "Henley" block. If so then this is totally wrong and dangerous as the inverter will try to backfeed into the grid in EPS mode when it must be isolated from it.
Apologies if I have misunderstood your description.
Diagram.
Inverter gets power from Main CU (through MCB 32 Type B behind RCD 63A, 30mA Type AC).
Then when it feeds mini CU through EPS it goes through MCB only and.
I'm not entirely sure how and WHY new mini CU is linked to main CU because there are too many cables to trace it.