Home Battery Savings Calculator
See how much a home battery could save you per year — with or without solar panels. Honest 2026 numbers, not sales gloss.
Your Details
UK average: ~£1,500/year. We cap savings at your bill.
Off-peak arbitrage needs a smart/EV tariff with a cheap night window.
5kWh suits most homes • 10–13.5kWh for large homes/EVs
Your Savings Estimate
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Tariff Arbitrage
Charge at ~8p/kWh off-peak, use at ~28p/kWh peak. Needs a smart/EV tariff like Octopus Go — saves roughly £250–£550/year without solar.
Solar Storage
Store excess solar for evening use instead of exporting at ~12p. Lifts self-consumption from ~35% toward 75%+.
8–13 Year Payback
On 2026 prices and tariffs, payback runs 8–13 years and hinges on the peak/off-peak spread. Batteries last 10–15 years.
Estimates are indicative and based on UK average electricity rates as of July 2026 (Ofgem cap 26.1p/kWh, smart-tariff off-peak ~8p, SEG export ~12p). Actual savings depend on your tariff, usage patterns, solar orientation, and weather. We assume one full charge/discharge cycle per day, 90% round-trip efficiency, ~330 effective cycles/year, ~2%/year capacity fade across the 10-year figure, and cap savings at your annual bill.
Smaller backup options
Not ready for a £4–10k installed battery? Portable LiFePO4 power stations cover outages, sheds, and renting. £119–£599.
As an Amazon Associate we earn from qualifying purchases. We also work with the Awin affiliate network.
Prices accurate as of 17 May 2026 and subject to change. The price shown on Amazon at the time of purchase applies.
Anker
Anker SOLIX C200 DC Power Bank Station, 192Wh Portable Power Station, LiFePO4 Battery, 200W Solar Generator, for Outdoor Camping, Traveling, and Emergencies (No Wall Adapter Included)
Pocket-size 192Wh. Phone, laptop, lights — entry-level emergency backup.
Anker
Anker SOLIX C300 Portable Power Station, Outdoor 288Wh LiFePO4 Battery, 300W (600W Surge) Solar Generator, 140W Two-Way Fast Charging, For Camping, Traveling, and Emergencies
288Wh LiFePO4. Runs a fridge for ~4hr or charges a laptop 5×. Light enough to carry.
Anker
Anker SOLIX C1000 Portable Power Station, 1800W (Peak 2400W) Solar Generator, Full Charge in 58 Min, 1056wh LiFePO4 Battery for Home Backup, Power Outages, and Outdoor Camping (Optional Solar Panel)
1056Wh / 1800W. Most-reviewed flagship — runs fridge, kettle, power tools through an outage.
Find your hidden 100W loads
Before sizing a battery, see what's actually drawing power. Plug-in and clamp meters from £12.
As an Amazon Associate we earn from qualifying purchases. We also work with the Awin affiliate network.
Prices accurate as of 17 May 2026 and subject to change. The price shown on Amazon at the time of purchase applies.
MECHEER
Electricity Usage Monitor Power Meter Plug Backlight Energy Monitor Plug Watt Meters 8 Modes, UK Socket Power Monitors Large LCD Display Consumption KWH Amp Volt Meter Outlet
Plug-in socket meter. Cheapest way to find your hidden 100W loads.
Shelly
Shelly EM Gen3 - Wi-Fi Smart Energy Meter, Single Phase, 2 Channel, 50A CT Included, Up to 2 CTs, Solar Ready, Contactor Control, Consumption Monitoring, Alexa & Google Home, No Hub Required
WiFi clamp meter, single-phase. Reads real-time grid import/export — solar + battery friendly.
Shelly
Shelly Pro 3EM (120A) - WiFi & LAN 3-phase Smart Energy Meter, DIN-rail mountable, Real-time Voltage Amps Monitoring via App, No Hub Required, Solar/Net Metering, Class B Active Energy, PV systems
3-phase WiFi meter. For homes with 3-phase service or workshops; pairs with most home automation.