Tools
Do the maths before you have the conversation.
Three working tools, built on real UK market figures. No email gate, no drip-feed, use them and walk away if you want to.
How much kit do you actually need?
Most people arrive with a quote and no way to sanity-check it. Start from your electricity bill and work backwards to a system size and a cost range.
What are you looking at?
≈ 461,538 kWh a year at 26p/kWh
Indicative system
Solar array
333 kWp
Generates ≈ 299,700 kWh/yr
Battery storage
316 kWh
Sized to shift roughly a quarter of daily consumption off peak.
Indicative installed cost
£359,500 – £521,750
≈ £85,506 a year avoided, simple payback around 5.2 years before finance.
A planning estimate, not a design or a survey. Built on UK commercial averages: 900 kWh/kWp/yr yield, 6.5 m² per kWp, 26p/kWh. Real sizing needs your half-hourly data, a structural check and a DNO connection position.