Solar Inverter tripping occasionally at startup

[Lm5861]

Hi all,

My 3 month old grid tie inverter has tripped on 3 occasions at startup.
Have read plenty of threads here about similar issues but unclear as to the fix.

So for my setup the inverter goes to a separate mcb on a separate secondary consumer unit. There is rcd protection here and it does not fail.

That secondary consumer is fed from a mcb of my main consumer which feeds the rest of my house, single rcd for entire consumer and it is at this rcd that trips on these occasions in the morning.

I have read about adding an rcd or rcbo straight after the ac isolator of inverter but I would have thought the rcd in my solar consumer would have done the same thing.

It sounds like my leakage is too great at the main consumer when all the house is combined with the solar?

What is people’s thoughts on remedy action to stop this? Thanks

 

[kropaske]

Your PV system should never be fed by shared RCD. At the moment your additional protection is compromised by this. To rectify this you need to swap main rcd for main switch and replace mcb's for Rcbo's or replace whole consumer unit.