Battery Storage
Store your power. Use it when you want.
Home batteries store electricity from your solar panels, or from cheap-rate grid tariffs at night. Use it when prices are high. Sell what you don't need back to the grid.
Typical battery lifespan
Self-consumption with battery vs 30% without
Round-trip efficiency
Typical battery size for a UK home
Three reasons to fit a battery.
Pair with solar
Stop giving the grid your sunshine.
Without a battery, the average UK solar home exports 70% of what it generates and buys electricity back at three or four times the price. A battery flips this. You use your own power first, export only the surplus.
Pairing a battery with solar typically lifts annual bill savings by 50-80 percent compared to solar alone.
Cheap-rate grid tariffs
Charge at 7p, use at 30p.
Time-of-use tariffs like Octopus Agile, Cosy or Go let you buy electricity at 5-10p/kWh overnight and use it during the day when grid prices are three to five times higher. A battery is what makes this work.
Best for homes with high evening usage, EV owners, and anyone with a heat pump.
Power cut backup
Keep the essentials running.
With the right battery and the right setup, you can keep your home running during a power cut. Lights, router, fridge, maybe your boiler, the things you actually need until the grid comes back.
Backup isn't standard on every install. It needs a specific inverter, a backup-capable battery, and a small bit of extra wiring. If keeping the power on matters to you, tell us on the quote call and we'll design for it.
What changes when you add a battery.
Without battery
- 30% self-consumption
- 70% exported, paid back at your SEG rate
- Bought back at peak rates
- Annual bill saving: moderate
With battery
- 85-90% self-consumption
- 10-15% exported
- Almost zero peak-rate grid buying
- Annual bill saving: substantially higher
Exact numbers depend on your usage pattern, roof size and tariff. The 30-minute call gives you the maths for your specific home.
Battery sizes, and who they're for.
Compact
Growatt 5 kWh
Best for: For smaller homes and lighter evening usage. Wall or floor mounted, indoor or garage, with the option to add modules if your needs grow.
- One unit, wall-mounted
- About 70-80% of household evening use
- 10-year warranty
- Indoor or garage install
Standard
Fox 6 kWh
Best for: The most common spec we fit for 3-bed homes. Covers most evening and overnight usage for an average household, with a strong app for monitoring.
- One or two units depending on brand
- Covers full evening + overnight for most homes
- 10-year warranty
- Can be stacked later
Large
Fox 12 kWh
Best for: For larger homes, EV owners, heat pumps, or anyone running time-of-use tariffs hard. Big enough to charge fully on cheap rate and run the house all day.
- Multiple units, modular
- Charges fully on cheap rate, lasts most of the day
- 10-year warranty
- Can be split between locations (e.g. garage + utility)
Brands we fit, and why.
Fox ESS
Reliable hybrid inverter ecosystem. A strong fit for homes adding storage alongside new solar, with a well-tested app and solid installer support.
Sigenergy
Modern modular system that scales with your home. AC or DC coupled, with backup options for homes that want resilience as well as savings.
Growatt
Reliable, sensibly-priced kit with a track record of long-term performance in UK homes. Strong choice when value matters as much as features.
We're brand-agnostic. The right battery depends on your inverter, your roof, your tariff and your house. We'll recommend what makes sense, not what we have the deepest discount on.
Honest answers about batteries.
Curious if a battery makes sense for your home?
We'll model it on the call. Real numbers, your usage.
We will never cold-call you. One reply within one working day.