- 1Overnight: the battery charges while demand and prices are low.
- 2Morning: the home draws normally; the battery holds its charge.
- 3Evening peak: the battery supplies part of the home's demand.
- 4Overnight again: the cycle repeats, adjusted to the household's pattern.
A day in the life of a home battery.
01
What the equipment actually is
A home battery system is typically a battery unit, an inverter that converts between the battery's direct current and the home's alternating current, isolation and safety equipment, and a controller that decides when to charge and discharge. In a managed scheme, the controller talks to a central system over an internet connection.
02
What a resident notices
In normal operation, very little. Lights, cooking, heating and appliances behave the same way. The system is not a power cut backup unless it has been specifically designed and installed for that, and it does not change who supplies your electricity.
The visible difference is on the bill or in the scheme's reporting — a different pattern of when electricity was bought.
03
What it does not do
A battery does not reduce how much electricity your home uses. It does not make appliances more efficient. And it cannot guarantee a saving, because that depends on your tariff, your usage pattern and how the system is controlled.
For residents
Nothing about how you use your home needs to change. The questions worth asking are about safety, maintenance, data and how any saving is passed to you.
For housing providers
Install access, safety sign-off, maintenance responsibility and connectivity are the practical delivery constraints. Plan resident communications around 'nothing changes day to day'.
Assumptions and limitations
- Describes managed battery systems of the kind used in Kettle's prototype.
- No saving figure is stated, because savings depend on tariff, occupancy and control.
Sources
- Battery storage advice
Energy Saving Trust, 15 July 2026
Where we are today