Friends:
I am engaged in a rather complicated decision process regarding an AG customer in PG&E territory. The customer spends a lot of money pumping water and wishes to offset that cost with installation of a grid-tied system. His two services are decrepit and have to be upgraded. There was some question if he will be required to upgrade from single phase to three phase given the size of his motor loads. We received a waiver to allow us to continue with single phase although I am not sure that is the right decision. We were also informed that the $20,000 cost to upgrade the single phase feeder to allow bigger services would be waived because of the potential revenue PG&E would earn over time. There is a review three years out and if the revenue meets projections based on existing loads, the construction credit would remain. If, however, after three years revenue decreased, the credit would be rescinded, requiring the customer to fork over the 20 grand. I was told that if we install solar and zero out the annual bill, that reduction in billing would trigger the rescinding of the credit. I want to check that the utility is interpreting this correctly. Do any of you esteemed wrenches have any experience in this area? Another question: If we go three phase and I wish to use inverters with two hot leads, I know they will work on three phase, but the back-feed will be imbalanced. I know we are allowed some amount of imbalance, but I am not sure how much. Anyone know this answer? I am searching for true three phase inverters in the less than 10kW range. This would require a connection to all three phases. I believe Enphase can do this. Are there any other units you know of? Thanks, William
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