Battery storage
Keep the power you make until you need it.
Solar makes most of its electricity while the house is empty. A battery holds it back for the evening, when it is not.
★★★★★Five stars on Google, as Radiant Roofing
Kent, Sussex and the South East
Fitted with solar or retrofitted
Qualified electrician in house
Free surveys, fixed-price quotes
Why a battery
Solar generates while the house is empty.
Without somewhere to put it, the surplus is sold to the grid for a fraction of what it costs to buy the same power back after dark.
Book a consultationMidday
The house takes what it needs first, and everything spare charges the battery instead of going out to the grid.
Evening
Lights, cooking, television and the car all run off the battery, so the units you use after dark are ones you already made.
Overnight
On a cheap night tariff the battery can top up while rates are low, and cover the morning before the sun is up.
What we install
Sized against your bills, not a package.
We look at a year of your usage and how much the roof will make before putting a size to it. Too small and it is empty by nine, too big and you have paid for capacity that never fills.
What goes in
11.5 kWh
Typical size
Covers a normal evening in most homes. Yours is set at the survey.
Wall
Where it goes
A garage, a utility room, or outside. It wants steady temperatures and a short run to the consumer unit.
Backup
Optional
Designed in from the start if you want the house to stay on through a power cut.
See what a battery would hold in your house.
Free survey, fixed quote, no obligation.
What's included
Everything from the survey to the handover
A look at a year of your usage, so the battery is sized to how you actually live
Battery supply and installation by a qualified electrician
Tie-in to your existing solar, or a hybrid inverter if you are fitting both
Monitoring set up on your phone, showing what is stored and what is being used
Charging scheduled around your tariff where it is worth doing
Certification, manufacturer warranty registration and a full handover pack
Common questions
Is a battery worth it with solar?+
For most homes, yes. Without one, spare daytime generation is exported for a few pence a unit while you buy evening power at full price. A battery closes that gap. We show you the figures for your own usage before you decide.
Can I add a battery to solar panels I already have?+
Usually, yes. It depends on the inverter you have: some accept a battery directly, others need an additional unit alongside them. We check what you have at the survey and tell you which it is.
Can I have a battery without solar?+
Yes. On a tariff with cheap overnight rates, a battery can fill up at night and run the house through the expensive part of the day. It is a smaller saving than a battery paired with panels, and it depends on your tariff, so we go through the numbers first.
Where does the battery go?+
Typically a garage, utility room or loft, or on an outside wall. It wants somewhere out of the way with reasonable temperatures and a straightforward cable run to the consumer unit. We confirm the position at the survey.
Will it power my home in a power cut?+
Only if the system is designed for it, which needs specific hardware and a separate backup circuit. Tell us it matters and we will design for it from the start, as it is far easier to include now than to add later.