Battery storage cost
fitted, with the inverter
A battery has to talk to a hybrid inverter. Most quotations leave that out; this one does not.
Brands we work with
One 5 kWh battery with the hybrid inverter it needs and the MCS certification is £4,515 to £5,349. Each further 5 kWh adds £2,040 to £2,335.
A real two battery quotation, with the inverter and certification, came to £6,555. Reconstructing it from the rates below gives £6,555.
Price a battery
One unit is 5 kWh. Above three of them it stops being a size you pick off a list and becomes a design, so it is not on here.
£4,500to£5,350
Supplied, fitted and commissioned, including the hybrid inverter and MCS certification. 0 per cent VAT until 31 March 2027.
Every figure on this site is an estimate based on published UK market ranges and our own installation experience. It is not a quotation. The price you are given after the free survey is the price you pay.
What goes into a battery price
The inverter is the line people are surprised by, and it is the reason two quotations for the same battery can differ by two thousand pounds.
| Item | Goods | Fitting |
|---|---|---|
| Fox ESS EP5, 5 kWh | £1,050 to £1,235 | £990 to £1,100 |
| Tesla Powerwall 3, 13.5 kWh | £7,295 | £1,500 |
| Hybrid inverter, if you do not have one | £650 to £689 | £1,100 to £1,500 |
| MCS certification | None | £725 to £825 |
The Fox ESS EP5 carries a warming function, which is what makes an outdoor or garage position workable in a London winter without losing capacity.
What the price includes
Everything below is inside the figure. Nothing here is an extra we add later.
The hybrid inverter
A battery cannot be bolted onto a string inverter. If you already have a hybrid, the price drops by the inverter line; if you do not, it is in the figure rather than added later.
MCS certification
Registration NIC-601634, and the DNO notification that goes with connecting storage to the grid.
Working with what you have
If there are already panels, we design around the existing array rather than replacing it. If there are none, a battery still pays on a cheap overnight tariff.
Questions people actually ask
Can I have a battery without solar panels?
Yes. It charges overnight on a cheap tariff and discharges through the expensive part of the day, which is a real saving on its own before a single panel is fitted.
It also gives you something during a cut, if the system is specified with a backup gateway.
How big a battery do I need?
Five kWh suits a flat or a two bedroom house with no heat pump. Ten is the common answer for a three or four bedroom house. Fifteen starts to make sense once there is a heat pump, air conditioning or an EV in the house.
Above about fifteen it stops being a size you pick off a list and becomes a design, so we work it out from your half-hourly consumption rather than guessing.
Does a battery help with air conditioning?
More than most people expect. Air conditioning runs hardest in the late afternoon and evening, which is exactly when the panels are fading and the tariff is at its peak.
Storing the middle of the day and spending it at six in the evening is the difference between cooling being cheap and cooling being something you hesitate over.
The survey is free and the written price is fixed
We measure the property, tell you what it needs and put a price in writing that does not move.
Monday to Friday 9am to 7pm, Saturday 10am to 3pm, Sunday closed
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