I have an interesting situation. I have a 12k solar PV array for a residential service. There are two interters that is expected to output 22 amps and 30 amps repsectively. They are also to have breaker in the Load Box at 30 amps and 50 amps respectively. According the my HQs read on NEC it states that I would need to install at 400 Amp Load box using 600 mcm wire. The Electric Utility company states that since the residence will not use any more the 200 amp service they would not upgrade the system to 400 amp service even though the code requires a 400 amp load box with xx circuits. Any thoughts?