How much do panels generate in summer?

June/July: 18-25kWh/day for a 4kW system (vs 1-2kWh in December). A 4kW system often generates MORE than a household uses — surplus goes to battery, hot water, or export.

Should I export more in summer?

Only if self-consumption is already maxed out. Priority order: (1) Use directly (saves 24.5p/kWh). (2) Store in battery (saves 24.5p later). (3) Divert to hot water (saves gas). (4) Export for SEG (earns 4.5-15p/kWh).

Is summer the best time to clean panels?

Late spring (April/May) is ideal — clear winter grime and pollen before the peak generation months. A clean at the start of summer maximises output during the most productive period.

Can I overproduce and waste electricity?

You won't waste it — surplus automatically exports to the grid and you earn SEG payments. But you EARN MORE by self-consuming (24.5p) than exporting (4.5p), so maximise self-consumption first.

Summer Solar Tips UK

Last updated: 18 March 2026

Independently written

Summer solar tips — Summer delivers 60-70% of your annual solar output — maximise every kWh.

How do I maximise summer solar?

Summer is peak solar season — 60-70% of your annual output comes May-August. 6 tips to maximise value: (1) RUN EVERYTHING ON SOLAR — washing machine, dishwasher, immersion heater, EV charging all between 10am-4pm. (2) DIVERT SURPLUS to hot water — a solar diverter (£300-£600) heats your immersion for free instead of exporting at 4.5p. (3) CHARGE YOUR BATTERY by 2pm — set your battery to prioritise solar charging over grid export. (4) PRE-COOL your home during peak solar (if you have air conditioning). (5) TURN OFF economy rate timers — you don't need cheap overnight electricity when solar covers everything. (6) CHECK PANEL CLEANLINESS — spring pollen and bird mess reduce output 3-8%. One clean = weeks of extra generation.

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