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Business case

Five numbers. That’s the whole decision.

Cost, saving, payback and what you could be ahead after 25 years. Move the sliders and watch them change.

1 · Who is it for?

Solar and battery packages for houses, fixed price installed.

2 · Pick a package
£110About 4,253 kWh a year
A · The kit costs£10,995Kilo Home, installed
B · It saves you£1,331/yrestimated, in year one
C · Over 25 years£31,610estimated savings and income
D · Pays for itself in8.4 yrswhen savings cover the cost
E · Then it’s profit£17,715estimated, after the kit and replacement parts

The kit costs £10,995. On these assumptions it could save about £1,331 a year, adding up to £31,610 over 25 years. It pays for itself in about 8.4 years, leaving you an estimated £17,715 ahead.

Get my exact numbers →Uses your postcode and roof. Free, about a minute, nothing to pay to book.
Where the savings come from, year one
Free solar power you use3,615 kWh you don’t buy at 26p£951
Spare solar you sell1,623 kWh at 12p£195
Battery charged cheap, used at peak1,007 kWh moved to 8p power£184
Total a year£1,331
Your money over 25 yearsPaid backStill paying offProfitTodayYear 10Year 20Yr 25
The assumptions, in full

Solar output 970 kWh per kWp a year (Midlands, EU PVGIS), falling 0.5% a year. Electricity at 26.32p for homes (Ofgem price cap, 1 October to 31 December 2026) and 25p for businesses, sold back at 12p, cheap overnight power at 8p. Standing charges are left out because you pay them with or without solar. Prices stay flat unless you tick the box. We include a new inverter in year 12 and new battery modules in year 13. Business prices are estimates before survey and exclude VAT; tax relief depends on your profits, so check with your accountant. Your personal plan uses your exact postcode, roof and Kilo OS smart-tariff planning, so its numbers will differ a little. These are estimates, not guarantees, and your survey confirms your real numbers.

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