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SolarEdge Home Battery for a EV household in Cardiff
Updated
The car and the SolarEdge Home Battery will want the same cheap hours in Cardiff. Decide which load is fed first, or the Cardiff payback for SolarEdge Home Battery is fiction.
SolarEdge Home Battery on a EV household in Cardiff
Roath terraces and Bay apartments fail for different reasons: shade and demise, which is the constraint I would write next to SolarEdge Home Battery for this EV household.
National Grid Electricity Distribution covers this Cardiff example. A 4 kWp-class roof at 980 kWh per kilowatt is about 2,940 kWh a year before shade, and SolarEdge Home Battery does not change that weather.
Money for SolarEdge Home Battery for a EV household in Cardiff
Take a 5 kWh pack, cycled about 320 times, at 90% round trip. Charge at 7.0p, and value what comes back at 29.6p. Export given up is priced at 10.0p. There are no panels beside this 5 kWh pack, so every unit charged comes off the grid. Delivered energy is about 1440 kWh. After charging cost and lost export, the figure saves about £314 a year. Set that against £3,723 fitted, which is a September 2026 illustration at the temporary 0% residential rate, not a quote. That is a simple payback of about 11.8 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 £3,723 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 SolarEdge Home Battery for a EV household in Cardiff
In Cardiff, on National Grid Electricity Distribution, 3.6 kW is in the band where G98 connect-and-notify is often enough. Export can still be capped. Agree that before the inverter is ordered. The figure uses 5 kWh and 0 kWp, which is enough to tell two quotes apart if they assumed something else.
In Cardiff, the weak case for SolarEdge Home Battery is simple: Mixed-brand roofs and anyone told they must replace working optimisers without a reason.
Would I proceed with SolarEdge Home Battery for a EV household in Cardiff?
I would not compare a £3,723 headline with another until usable kWh and the fate of any existing inverter match.
I would proceed on SolarEdge Home Battery for a EV household in Cardiff only after the cupboard, the 3.6 kW connection route and the tariff gap are written down.
Common questions
Is the price on this page a quote?
No. £3,723 is a September 2026 illustration for a 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 5 kWh example the inverter is 3.6 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 £3,723 job, that folder is part of what you bought.
What if the cheap rate is not 7p?
Then the figure changes. This page used 7.0p 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.