A tool does one sum. Solar Base does the whole job.
The STC count, the NMI, the meter alteration and the invoice, worked off one job record, with the last step left to you.
Where the customer's NEM12 file comes from
Customers with a smart meter can download their interval data from their distributor's online portal, or ask their retailer for it. It comes as a CSV in AEMO's NEM12 format: a few header lines, then one line per day with every half hour's use.
Sizing from that file beats sizing from a bill. A bill gives a quarter's total; the file shows when the power is used, which is what decides how much a battery can shift.
Why the 80th percentile
A battery sized for the average night runs out on every night busier than average, which is half of them. Sizing for the 80th-percentile night covers most nights fully without paying for capacity that only the coldest week of winter would use.
Questions installers ask
Does it count solar export?
No. It reads only the consumption channels (suffixes starting with E) and ignores export channels (B), so the profile is what the household draws.
What if the customer already has solar?
Then daytime use in the file is net of their solar. The evening and overnight window, which is what the battery covers, is still the household's real use.
Is the file uploaded anywhere?
No. It is read by the page in your browser and goes nowhere.