We fitted a solar system some 2 years ago which has been working fine iuntil about 3-4 months ago when the customer reports his inverter keeeps cutting out. Cuase of this is the grid supply which keeps hitting 250V (max allowed 253v) not leaving any room for inverter to operate under G83 requirements. NOw we have contacted Western Power to go investigate, but I'm half expecting WP to say 'it's in tolerance, tough titty'. I am therefore after a potential solution to problem should that occur. I have considered something like a v-phase, but apparently that's not suitable. Only real answer that I can think of is getting WP to sort out their system, or setting voltage parameters higher which contravenes G83 requirements.