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Home battery installation in Cambridge
Updated
Cambridge pairs a tight historic centre with newer estates and villages that function as part of the commuting area. EV ownership is common enough that battery-and-charger designs come up in the same survey.
The houses, not the postcode average
Newer estates often have clean roofs and a garage. Historic streets do not.
A battery, a charger and an induction hob can collide on a single-phase supply. Load management is part of the design, not an app setting you hope works later.
New-build estates are physically easy and sometimes restricted by developer covenants about external equipment.
What gets fitted here
The joined-up job is solar, a right-sized battery and a smart charger, with an export limit agreed with UK Power Networks.
East Anglian winters still humble oversized packs.
UK Power Networks, yield and a 4 kWp example
A 4 kWp array at 1000 kWh per installed kilowatt is about 4,000 kWh a year before shade. That is the local ceiling on solar charging, not a promise the battery will cycle fully in January.
In Cambridge, on UK Power Networks, 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 13.5 kWh and 4 kWp, which is enough to tell two quotes apart if they assumed something else.
Take a 13.5 kWh pack, cycled about 280 times, at 90% round trip. Charge at 13.0p, and value what comes back at 27.2p. Export given up is priced at 6.0p. About 2160 kWh a year of the charge is treated as spare solar from 4 kWp that might otherwise have been exported. Delivered energy is about 3402 kWh. After charging cost and lost export, the figure saves about £611 a year. Set that against £8,443 fitted, which is a September 2026 illustration at the temporary 0% residential rate, not a quote. That is a simple payback of about 13.8 years on these assumptions. Nudge the night rate up by 4p and see if you still like it.
What I would not sign in Cambridge
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 £8,443 on that basis. It does not apply to a shop, and it does not apply to a battery you buy and fit yourself.
I would not pay the bulk of £8,443 before the DNO route for a 5 kW inverter is known.
The hob, the charger and the battery will meet on one single-phase supply. Someone has to say who yields.
Common questions
Is the price on this page a quote?
No. £8,443 is a September 2026 illustration for a 13.5 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 13.5 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 £8,443 job, that folder is part of what you bought.
What if the cheap rate is not 7p?
Then the figure changes. This page used 13.0p as a charge rate and 27.2p 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.