Store your daylight for the evening peak.
A properly sized battery is the difference between exporting energy for pennies and using it yourself for pounds. We design storage against your actual half-hourly demand — for retrofits and new installs alike.
Four jobs — in this order.
Store solar generated in the middle of the day for evening use.
Blunt expensive evening tariff peaks or commercial demand charges.
Charge from the grid on cheap off-peak windows and discharge on peak.
Keep critical circuits on during a short grid outage, with the right hardware.
The right number is the one your evenings ask for.
For most households the sweet spot is 5–10 kWh. We model both cases so you can see the payback difference before committing.
See what adding storage changes.
A rough figure before we survey.
Move the dials to see roughly what a system might do. Real numbers come from a site survey — this estimator is deliberately conservative and uses public assumptions listed below.
- Generation:
- 950 kWh/kWp/yr (South East)
- Import rate:
- 26p/kWh — indicative 2026 rate, verify with your supplier
- SEG export rate:
- 12p/kWh — indicative 2026 rate, verify with your supplier
- Self-consumption:
- 75% with a battery — 3,206 kWh self-used, 1,069 kWh exported
- Household usage:
- £1,680/yr ÷ 26p/kWh ≈ 6,462 kWh — self-use is capped at what you actually consume
- Payback:
- £11,175 indicative install cost ÷ £962 first-year benefit
Assumes 950 kWh/kWp/yr in the South East, import 26p/kWh, SEG 12p/kWh, self-consumption 75% with battery / 35% without. Indicative 2026 rates.
Conservative estimate — your real figures come from a site survey.
Book a survey for a precise figure