13 years, based on using 60% of the generation in winter, and 36% of the generation in spring/summer months.All the information and advice I've been reading is that since the government stopped with their feed in payments just having solar takes a long time to pay back.
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My calculations are based off a 5.5p export tariff, the system cost is £4795, the capacity is 4.235kwp (11*385w panels), 5 south facing, 6 west facing.
Payback should be reduced if wholesale prices stay high and I can get on Octopus outgoing agile, I can be on SVR for import as the only incompatible tariff for agile export is their GO one.
I simulated a 4.8kw battery and I still end up drawing from the grid even from a full charge by about 2am in the morning, it wouldn't therefore help first thing, is it would be empty for breakfast cuppa/toaster duties.
I've been looking into this since July and I've sent myself crazy with various calculations and costings.
My yearly cost saving based on 20p/kwh is £265.30
SEG @5.5p should come to about £100