Free Tool

Balcony Solar Savings Calculator

Enter your details below to see how much a plug-in balcony solar system could generate and save — based on real PVGIS irradiance data for your region.

1. Your UK Region

Solar irradiance varies significantly across the UK — the South West gets roughly 25% more sun than Scotland.

2. Balcony Orientation

Which direction does your balcony railing face? Stand on your balcony and face outward — that direction is your orientation.

SouthMaximum output — faces sun all daySouth-EastExcellent — morning-heavy generationSouth-WestExcellent — afternoon-heavy generationEastGood — strong morning generationWestGood — strong afternoon generationNorthLow output — not recommended if alternatives exist

3. Panel Wattage

300W600W800W

Most UK balcony systems are 400–800W. 600W is the most common.

4. Your Electricity Unit Rate

pence per kWh

Find this on your energy bill. As of Q1 2026, the Ofgem price cap sets the typical rate at around 24p/kWh.

5. Your Budget

Your Estimated Results

Annual Generation

403kWh/yr

Annual Saving

£97/yr

at 24p/kWh

Estimated Payback

9.8years

Based on EcoFlow STREAM at £949

Recommended System

EcoFlow STREAM

£949

All-in-one system with smart app control and optional battery storage

Best all-rounder with smart features

View on retailer site →

Estimates based on PVGIS solar irradiance data, adjusted for a typical balcony mounting angle (~70°). Actual output varies with shading, dust, and system efficiency.

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