Commercial solar calculator

An honest indicative payback for your site — in under a minute.

Built the way Nuvolt's engineers actually size systems: against real demand, regional yield and the half-hourly profile of your building. Tune it as deep as you like — every number is defensible and footnoted.

· 60-second quick estimate· Optional advanced inputs· Battery + EV uplift· Shareable URL

Indicative results · region UK average

System size

240 kWp

1,500 m² used

Annual generation

228 MWh

950 kWh/kWp/yr

Year-1 saving

£43k

4y 8m payback

Capex (indicative)

£188k–£228k

Payback

4y 8m

25-yr net saving

£1.60m

IRR

23.5%

Cumulative cashflow including 0.5% annual degradation, 4% tariff inflation, and 1% / yr O&M. Discount rate 6%.

Sensitivity · payback at

Tariff −10%5y 3mTariff +10%4y 3mCapex −10%4y 3mCapex +10%5y 2m

How we calculate

· Yield from PVGIS-seeded UK postcode-area averages (820–1050 kWh/kWp/yr).
· System size capped by roof area at 0.16 kWp/m² and matched to your demand × daytime share.
· Self-consumption blends daytime share, operating profile and (optional) battery uplift.
· Capex bands by system size, mounting type, battery £/kWh and EV charger count.
· 25-yr cashflow with 0.5% annual degradation, your tariff inflation, 1% O&M, 6% discount rate.
· Carbon factor 0.207 kgCO₂e/kWh, conservative trees / miles / homes equivalents.

Indicative only — a Nuvolt site survey and half-hourly data audit confirms every number.

Lower commitment

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