Calculator
Balcony solar calculator
Pick your city, the way your balcony faces and the size of the kit. Output comes from PVGIS (European Commission); savings depend on how much of that energy you use as it is produced.
This is an independent information site: we do not make or sell solar kits.
Which way does your balcony face?
Turn the compass and see how much you lose compared with the best position (south, 30°). PVGIS data for the city you choose.
Drag the compass, click a direction or use the arrow keys.
South
74%
of the maximum output
594 kWh/year with a 800 Wp kit
We do not calculate north: a north-facing balcony gets almost no direct sun and a kit rarely pays off.
Source: PVGIS v5.3, Joint Research Centre of the European Commission. System losses: 14 %.
Balcony kits on Amazon.co.uk
Picked for their specifications, not the commission. Before buying, check the price, availability and certificates on the listing.
Products available on Amazon.co.uk. Each country has its own selection: switch language to see that country’s store.
Voltacon
800W Plug-In Solar Kit Hoymiles HF-800-WB + 2x JA Solar 465W
- 2 panels · 930 Wp
- 800 W microinverter
- UK plug
Affiliate link
Check that the inverter is listed for G98 and tell your network operator (DNO). We have not yet confirmed that this kit meets version 2 of the government’s plug-in specification. Rules in the UK
Listings checked on 6 November 2026. As an Amazon Associate, this site earns from qualifying purchases. Affiliate links do not change the price or the order of our recommendations.
How we calculate it
- Output: PVGIS v5.3 for 1 kWp at that city, orientation and tilt, multiplied by the kit size. System losses: 14%. Data retrieved on 6 November 2026.
- No shading: a balcony in partial shade can produce much less. PVGIS only accounts for the terrain on the horizon.
- Energy used at home: between 25% and 80% of the output, depending on your usage and whether someone is home during the day, with a ±10 point margin. This is our own estimate, calibrated against figures published by Verbraucherzentrale and Finanztip (HTW Berlin simulator).
- Energy you do not use flows into the grid unpaid and does not count as savings.
- Payback divides the kit price by the yearly savings. It leaves out panel degradation, maintenance and changes in electricity prices.