I don't have any solar but I've also done the same sort of calculations in spreadsheets, and I find the discrepancy is usually the Local Access Fee. It is 11.11% of the Distribution Tariff (Transmission Charge + Distribution Charge) plus 11.11% of the Energy Charge charged at the Regulated Rate Option. The RRO fluctuates, so it's not always clear to me how many kWh are charged at what RRO rate.
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