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From when I calculated it was about 4.5-5y payback on just solar, and 7-8 years with battery system.
We have a solar water diverter so using gas when gas rates are cheaper, and intend to heat the tank at night with cheap electricity if gas rates go higher than electric.
If you plan to move home in the next 7 years then solar + battery is unlikely to be worth it financially, as I don’t think solar panels are priced into property sale values.
Might make it more desirable for purchase though going forwards, as lower bills and lower energy performance ratings might become more important purchase requirements.
Acliff
Soul
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.