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dbr
I'm calculating around 8 years payback at the moment. It's tough because return to grid and energy tariffs are all over the place.
Costs are as follows:
Estimated annual electricity usage - 14,000kWh
Estimated usable generation - 4,500kWh
Estimated annual electricity saving with Solar / battery - £1.3k (ish)
Estimated annual gas saving with ASHP - £?? probably a slight increase but that's more about ditching gas than saving money
I'll need to see how to manage the ASHP practically with the cheaper overnight energy rates, battery storage etc to see if it can save money vs gas.
Currently looking like the solar install will be by Christmas but ASHP won't be until May.