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Alternatively, you can use a typical consumption profile from the library and estimate the average daily kWh. You can make an educated guess by checking the current consumption based on the current bill + (estimated solar generation from old/existing system - solar export from the old/existing system).
Note the average daily grid energy usage on the current bill
Note the average daily solar export on the current bill
Estimate the average daily production of the existing solar system.
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Total consumption = [existing solar production] - [solar export] + [grid usage] |
So if the site is using 10 kWh/day currently as per the energy bill and the site has an old 4 kW system that produces 12 kWh/day and is exporting 5 kWh/day, the actual consumption would be 10 + ( 12 - 5 ) + 10 = 17 kWh, assuming the old system produces 12 kWh/day.