Lets say you install 3 X 5 kva inverters in parallel ... The system is used as a backup only (no solar panels) from the meter to the main DB ... from the main DB to the inverters and back to the main DB (no splitting essential/non essential ... everything is connected to the 3 inverters in parallel and ther eis sufficient power to supplt the entire installation so no switching off breakers required) how do you configue the circuit breakers and wire size?

Do you fit a 63 amp tripple pole mcb on the input side and the 1 on the output side and use 16 mm wire to connect?

Do you fit a 32 amp triple pole mcb on the input and 1 on the output side and use 4 mm wire?

Do you fit a 63 and single pole breaker ... then take a 16 mm wire from the busbar to each inverter ... out of each inverter to a busbar and then to a 63 amp breaker ... from the breaker to the main switch

Then to complicate the setup ... there is a changeover/ bypass switch.

A 5 kva inverter can carry a max of 22 amps x 3 = 66 amps

It is interesting to see the way some people are doing it ... is it the correct way to do it ... who knows ... I think a lot of people are just taking a chnace and hoping their method works...

if you look at the instruction manual supplied with the inverter manufacturer ... you could get yourself into a bit of shyte ... fusing the neutral ... eeeish.

Looking at anex P ... earht leakage before the inverter ... why would you install and earth leakage before the inverter ... and generally the load is "essential".

This reminds me of back (many many years ago) when we started doing generator installations ... thanks to load shedding (genrators went from R3K per unit to R12K wihin weeks and the containers were arriving by the the thousands ... then sudddenly the load shedding stopped without notice and people lost a lot of money for all those container which sat for months) ... there was much confusion ... eventually the technical people visted a few of the sites and so we learnt how to do it correctly.