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Enphase IQ Battery for a heat pump in Plymouth
Updated
A Enphase IQ Battery will not run a heat pump through a cold Plymouth evening from 8 kWh. It can shift a slice of the Plymouth load into a cheaper window, and that slice is the only honest sale.
Enphase IQ Battery on a heat pump in Plymouth
Wind on the roof and steps up from the van both belong on the quote, not in a surprise email, which is the constraint I would write next to Enphase IQ Battery for this heat pump.
National Grid Electricity Distribution covers this Plymouth example. A 4 kWp-class roof at 1050 kWh per kilowatt is about 3,150 kWh a year before shade, and Enphase IQ Battery does not change that weather.
Money for Enphase IQ Battery for a heat pump in Plymouth
Take an 8 kWh pack, cycled about 320 times, at 90% round trip. Charge at 9.0p, and value what comes back at 29.6p. Export given up is priced at 10.0p. About 914 kWh a year of the charge is treated as spare solar from 2.5 kWp that might otherwise have been exported. Delivered energy is about 2304 kWh. After charging cost and lost export, the figure saves about £461 a year. Set that against £5,743 fitted, which is a September 2026 illustration at the temporary 0% residential rate, not a quote. That is a simple payback of about 12.5 years on these assumptions. Nudge the night rate up by 4p and see if you still like it.
Where the job is a qualifying install in a home, the 0% rate runs to 31 March 2027 and is due to become 5% after that. This figure prices the work at £5,743 on that basis. It does not apply to a shop, and it does not apply to a battery you buy and fit yourself.
Connection for Enphase IQ Battery for a heat pump in Plymouth
In Plymouth, on National Grid Electricity Distribution, 5 kW sits above the 3.68 kW G98 line, so this wants a G99 application before anyone energises it. Export can still be capped. Agree that before the inverter is ordered. The figure uses 8 kWh and 2.5 kWp, which is enough to tell two quotes apart if they assumed something else.
In Plymouth, the weak case for Enphase IQ Battery is simple: Unshaded simple roofs where a mainstream hybrid would store the same evening energy for less.
Would I proceed with Enphase IQ Battery for a heat pump in Plymouth?
I would not compare a £5,743 headline with another until usable kWh and the fate of any existing inverter match.
I would proceed on Enphase IQ Battery for a heat pump in Plymouth only after the cupboard, the 5 kW connection route and the tariff gap are written down.
Common questions
Is the price on this page a quote?
No. £5,743 is a September 2026 illustration for a 8 kWh example at the temporary 0% residential rate. Your survey replaces it.
Will it stay on in a power cut?
Only if a gateway or essential-load board was designed and paid for. A standard grid-tied battery turns off with the grid. On this 8 kWh example the inverter is 5 kW, and backup is still a separate line.
What paperwork should I keep?
Keep the MCS certificate where the job is certified, the electrical certificate, the DNO record, the schematic, the warranty registration and a photo of the schedule. For an illustrated £5,743 job, that folder is part of what you bought.
What if the cheap rate is not 7p?
Then the figure changes. This page used 9.0p as a charge rate and 29.6p as the rate avoided. A smaller gap means a worse payback. Read the live tariff.
Sources
Want a price for your house?
The figures above are a rough guide. An installer still needs to see your fuse board, where the battery will go, and whether you want power during a blackout.