How many kWh per day for a 4kW system?

Average: 10-11 kWh/day. Summer peak: 18-25 kWh. Winter low: 2-4 kWh. Spring/autumn: 8-14 kWh.

Is 10 kWh per day enough?

Average UK household uses ~10 kWh/day — so a 4kW system MATCHES average daily consumption over the year. But timing mismatches mean you still import some grid electricity.

Solar Panel Daily kWh Output

By Home Solar Guide Team|Updated 20 March 2026|educational

Independently written | Plain-English guide

Daily solar kWh output UK — 10-11 kWh/day average — but varies enormously by season and weather.

Find the right system size for your roof

Panel count depends on your electricity use, roof space and direction — not on a rule of thumb. Get a recommended size and what it should cost.

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Find the right system size for your roof

Panel count depends on your electricity use, roof space and direction — not on a rule of thumb. Get a recommended size and what it should cost.

Size My System

How many kWh do solar panels produce per day?

A 4kW UK solar system produces an average of 10-11 kWh per day across the year. This varies hugely: clear June day: 22-25 kWh. Cloudy June day: 10-15 kWh. Clear March day: 12-16 kWh. Overcast December day: 1-3 kWh. The average is exactly that — an average. Summer produces 4-6x more per day than winter. Your monitoring app shows daily output in real-time.