I noticed something else and I'm hoping someone with more technical expertise can help. I noticed my delta inverter is a '6.6' and shows 6600W as the continuous output power. My solar system panel-wise adds up to 7.5kWh. Does anyone know if this is correct? Or was I given an undersized inverter?
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Secondly, I talked with PG&E and found out why they are requiring a transformer upgrade. They said it's because of the powerwall. They said they are taking a worst case scenario where the 7.5kWh are being exported AND the powerwall is also exporting to the grid (assuming 5 kWh?). So they said the added total is more than the transformer will hold.
Interestingly they said that they will be installing a locking device on the powerwall so that I can use my solar alone before the transformer upgrade is complete (but I will not be able to use the powerwall until it's complete). Not sure how I feel about losing 6 months out of my 10 year warranty due to this (not to mention not having usage of it), but not sure what else I can do.