Places · Case file
Sigenergy SigenStor for a EV household in Brighton
Updated
The car and the Sigenergy SigenStor will want the same cheap hours in Brighton. Decide which load is fed first, or the Brighton payback for Sigenergy SigenStor is fiction.
Sigenergy SigenStor on a EV household in Brighton
Regency conversions stop more jobs than the price of the cells. Ask the freeholder before you fall in love with a cabinet, which is the constraint I would write next to Sigenergy SigenStor for this EV household.
UK Power Networks covers this Brighton example. A 4 kWp-class roof at 1030 kWh per kilowatt is about 3,090 kWh a year before shade, and Sigenergy SigenStor does not change that weather.
Money for Sigenergy SigenStor for a EV household in Brighton
Take an 8 kWh pack, cycled about 340 times, at 90% round trip. Charge at 9.0p, and value what comes back at 30.8p. Export given up is priced at 12.0p. About 971 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 2448 kWh. After charging cost and lost export, the figure saves about £503 a year. Set that against £6,080 fitted, which is a September 2026 illustration at the temporary 0% residential rate, not a quote. That is a simple payback of about 12.1 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 £6,080 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 Sigenergy SigenStor for a EV household in Brighton
In Brighton, 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 8 kWh and 2.5 kWp, which is enough to tell two quotes apart if they assumed something else.
In Brighton, the weak case for Sigenergy SigenStor is simple: A tiny terrace that only needs 5 kWh and a simple AC retrofit beside a healthy existing inverter.
Would I proceed with Sigenergy SigenStor for a EV household in Brighton?
I would not pay the bulk of £6,080 before the DNO route for a 5 kW inverter is known.
I would proceed on Sigenergy SigenStor for a EV household in Brighton 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. £6,080 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 £6,080 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 30.8p 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.