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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:
- ASHP (inc a couple of replacement rads, hot water tank, inverter, install etc) - £2,700
- Solar (12 panels, 7.2kw battery, install etc) - £9,450
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 moneyI'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.
- ASHP (inc a couple of replacement rads, hot water tank, inverter, install etc) - £2,700
Soul-
I just fitted Homely to manage our ASHP. The installer app updated the other day and now has a button to “add inverter” - could be battery / solar integration
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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. -
return to grid and energy
I thought this was not a thing? i.e. it was at 1 point but they stopped it?
dbr
Acliff
amey
Yeah, they are supposed to be fair cheaper now. I was a presso the other day and it looked like the cost had just tanked. Yet, all the quotes for installation (note - installation, so time and materials and other costs like batteries) I've ever seen are so fucking marginal in terms of return / benefit. Someone is benefitting and I suspect it's not the consumer.
Would be good to see your working. You'd need to decouple it from the ASHP or include the cost of that in the calculations.
I'd be far happier assuming the warranty / guarantee on these things is worth the paper it's written on if a significant benefit was achievable early on in their lifetime.