Economy 7 Battery Storage
Economy 7 is one of the UK's best tariffs for battery storage. Charge your plug-in home battery at the cheap overnight rate (as low as 7p/kWh) and use stored energy through a supported connection during higher-rate hours (25–30p/kWh). Use the calculator to estimate your saving.
Works with all Economy 7 suppliers · No smart meter required · plug-in home batteries from £999
How Economy 7 Battery Storage Works
7 Hours of Cheap Charging
Your battery charges during the full Economy 7 off-peak window (typically midnight to 7am). At 7–10p/kWh, that's less than a third of daytime rates. The plug-in home battery charges fully in 2–6.5 hours depending on size.
Power Your Home All Day
During expensive peak hours (25–30p/kWh), the battery powers your home instead of the grid. Every single kWh shifted saves you 15–20p. The CT clamp monitors your usage and optimises discharge automatically.
Savings Compound Year on Year
Tariff prices change, so recheck your estimate when rates move. Savings are never guaranteed.
Why Economy 7 Is Ideal for Battery Storage
Economy 7 offers some unique advantages that make it one of the best tariffs for home batteries in the UK.
Longest Off-Peak Window
7 hours of cheap electricity gives plenty of time to charge even the largest AEG 14.4 kWh battery. No rush, no missed charging windows.
Biggest Price Spread
Economy 7 typically has the largest gap between peak and off-peak rates (20p+ difference), meaning more savings per kWh shifted.
No Smart Meter Required
Unlike Octopus Go and other modern tariffs, Economy 7 works with traditional dual-rate meters. No upgrade needed.
Available from Most Suppliers
Economy 7 is offered by British Gas, EDF, E.ON, SSE, OVO, and most UK energy suppliers. You're not locked into one provider.
Economy 7 Battery Savings by Size
Based on OFGEM typical consumption values and current Economy 7 rates (night 10p/kWh, day 30p/kWh).
Worked example: Economy 7 at 9.5p cheap / 31.24p peak, a typical 2,700 kWh/yr home, 90% usable capacity, 90% round-trip efficiency, 330 cycles a year. Stored energy is capped at what the home uses outside the cheap window. Your figure will differ — the calculator uses your own numbers.
Fox Mini Qube 2.11 kWh
Perfect for 1–2 bed homes
Marstek Venus-E 5.12 kWh
Ideal for 3 bed family homes
Fox Mini Qube 10.55 kWh
Best for large homes & EVs
*Estimates based on medium household usage (2,700 kWh/yr), Economy 7 night rate 10p/kWh, day rate 30p/kWh. Savings compound with 5% annual energy inflation. Actual savings vary.
Economy 7 vs Octopus Go: Which Is Better for Batteries?
Both tariffs work brilliantly with battery storage. Here's how they compare.
| Economy 7 | Octopus Go | |
|---|---|---|
| Off-peak window | 7 hours (midnight–7am) | 4 hours (00:30–04:30) |
| Off-peak rate | 7–10p/kWh | 7.5p/kWh |
| Peak rate | 25–30p/kWh | ~24p/kWh |
| Price spread | 15–23p/kWh ✅ | ~16p/kWh |
| Smart meter needed? | No ✅ | Yes |
| Available from | Most UK suppliers ✅ | Octopus Energy only |
Already on Octopus? See our Octopus Energy battery guide →
Compatible Time-of-Use Tariffs
The plug-in home battery works with any tariff that offers cheaper overnight rates. Not just Economy 7.
How much could you save?
Use our free calculator to see your savings in 30 seconds.
Economy 7 Battery Storage FAQ
Can I use a battery with Economy 7?
Yes. Economy 7 is one of the best tariffs for home battery storage. The 7-hour off-peak window gives plenty of time to fully charge even an AEG 14.4 kWh battery. The plug-in home battery is AC-coupled and plugs into a standard 13A socket — check the connection route.
How much can I save with Economy 7 and a battery?
Savings depend on your current tariff rates, usage, usable capacity, losses and the load your chosen connection can serve. Use the calculator for a personal estimate.
Is Economy 7 better than Octopus Go for batteries?
Both work well. Economy 7 has a longer cheap window (7 hours vs 4), a bigger price spread, and doesn't require a smart meter. Octopus Go has a slightly lower off-peak rate. Economy 7 is available from more suppliers.
What size battery do I need for Economy 7?
Match usable capacity and output to the load you can actually serve. The current range is Fox Mini Qube 2.11–10.55 kWh (AC or Hybrid) and Marstek Venus-E 5.12 kWh; the calculator compares them.
Do I need a smart meter for Economy 7 battery storage?
No. Unlike Octopus Go, Economy 7 works with traditional dual-rate meters as well as smart meters. No upgrade needed.
Can I use solar panels AND Economy 7 with a battery?
Absolutely. During the day your battery charges from excess solar (free), and overnight it tops up from Economy 7's cheap rate. You get the best of both worlds. See our solar battery retrofit guide for more.
Related Pages
Octopus Energy Battery Storage →
Compare all Octopus tariffs for batteries.
Plug & Play Battery Storage →
Check the connection route for your chosen model.
Is a Home Battery Worth It? →
Costs, savings, and payback analysis.
Solar Battery Retrofit →
Add battery to existing solar panels.
Battery Payback Calculator →
How fast will a battery pay for itself?
Home Battery Storage UK →
Complete guide to home batteries.
Start Saving with Economy 7 + Battery
Leave your details and we'll help you find the right battery for your Economy 7 usage.
Got questions? Call us
+44 7782 218686Or tap the chat icon bottom-right — we'll get straight back to you.