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.
This calculator assumes you pay up front. Eligible lower-income households can get solar and battery fully funded through the government's Warm Homes Plan (from 20 January 2026), and government-backed zero and low-interest loans for others are announced but not yet live (terms due later in 2026, mainstream rollout expected from 2027).
Renting, or no suitable roof? A plug-in solar kit of up to 800W plugs into a wall socket with no installer. Government figures put the saving at £70 to £110 a year.
Smaller backup options
Not ready for a £4–10k installed battery? Portable LiFePO4 power stations cover outages, sheds, and renting.
As an Amazon Associate we earn from qualifying purchases. We also work with the Awin affiliate network.
Amazon prices as of 10 Oct 2026, 20:36 UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change.
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 C1000 Gen 2 with AC charging cable, 2000W 1024Wh Power Station
1024Wh / 2000W, 49-min recharge. Runs a fridge, kettle or power tools through an outage.
EF ECOFLOW
EF ECOFLOW DELTA 3 Classic Portable Power Station, 1024Wh LiFePO4 Battery
1024Wh / 1800W, 0–80% in 45 min from the mains. 10 ms switchover for a router or PC.
Find your hidden 100W loads
Before sizing a battery, see what's actually drawing power. Plug-in and clamp meters.
As an Amazon Associate we earn from qualifying purchases. We also work with the Awin affiliate network.
Amazon prices as of 10 Oct 2026, 20:36 UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change.
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 Pro 3EM 120A V2 – DIN Rail 3-Phase Smart Energy Meter 100-260 V, with 3 CTA x120A, Matter, No Hub Required, Wi-Fi, LAN & Bluetooth, Solar & PV Monitoring, 60-Day Data Log
3-phase WiFi meter. For homes with 3-phase service or workshops; pairs with most home automation.
EMPORIA ENERGY
Smart Home Energy Monitor with 16 50A Circuit Level Sensors | Vue - Real Time Electricity Monitor/Meter | Solar/Net Metering
16-channel circuit-level monitor. See exactly which appliance is eating your bill.
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