AC Cable size - 10kw PV installation

[waverider]

Hi, I am about to install my first 10kw system, the project manager has bought 6mm T&E and a 45A MCB. The cable run is 30 meters. Doesnt seem right to me. any suggestions?

Thanks

 

[mmccx]

do a volt drop calc, but i would say that is way way way too small, but the mcb is fine

 

[SolarCity]

Seems undersized to me too. Remember you're only allowed only 1% volt drop. I'd use a bigger breaker too. 45A should be ok but 10kW could be running it at capacity (albeit rarely) and I never like running breakers at capacity if I can help it.