# Home Battery Economics Calculator — United Kingdom

> Value stored electricity after charging losses and the opportunity cost of the charging energy. GBP planning view; stated limitations apply.

Page: https://askcalculators.com/uk/home-battery/
Definition: https://askcalculators.com/uk/home-battery/definition.json
JSON Schema: https://askcalculators.com/uk/home-battery/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/uk/home-battery/?capacity=10&usablePercent=90&cycles=250&roundTripEfficiency=90&peakRate=0.3&chargingRate=0.1&projectCost=10000&incentive=0&maintenance=0&years=25&discountRate=4&degradation=0.5&energyEscalation=2&replacementYear=0&replacementCost=0

## Inputs
- capacity: Nameplate battery capacity, kWh; type=number; required; default=10; min=0.1; max=100000
- usablePercent: Usable capacity; type=percent; required; default=90; min=0; max=100
- cycles: Equivalent full cycles per year; type=number; required; default=250; min=0; max=730
- roundTripEfficiency: AC round-trip efficiency; type=percent; required; default=90; min=0; max=100
- peakRate: Avoided high-price electricity per kWh; type=money; required; default=0.3; min=0; max=1000000000000
- chargingRate: Charging energy opportunity cost per kWh; type=money; required; default=0.1; min=0; max=1000000000000
- projectCost: Installed battery price; type=money; required; default=10000; min=0; max=1000000000000
- incentive: Confirmed incentive; type=money; required; default=0; min=0; max=1000000000000
- maintenance: Annual maintenance; type=money; required; default=0; min=0; max=1000000000000
- years: Planning horizon, years; type=number; required; default=25; min=1; max=50
- discountRate: Annual discount rate; type=percent; required; default=4; min=0; max=50
- degradation: Annual output degradation; type=percent; required; default=0.5; min=0; max=20
- energyEscalation: Annual energy-price escalation; type=percent; required; default=2; min=0; max=25
- replacementYear: Replacement year (0 means none); type=number; required; default=0; min=0; max=50
- replacementCost: Replacement cost; type=money; required; default=0; min=0; max=1000000000000

## Outputs
- capital: Net capital cost; format=currency
- annualSaving: First-year net saving; format=currency
- payback: Simple payback, years; format=number; primary
- npv: Discounted net value; format=currency
- delivered: First-year delivered electricity, kWh; format=number
- charged: First-year charging electricity, kWh; format=number
- breakeven: Cash-flow break-even year; format=number
- cumulative: Undiscounted lifetime net benefit; format=currency

## Formula
arbitrage benefit = usable kWh × cycles × peak price − charged kWh × charging price.

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.