Key takeaways
- • Plug-in solar in Great Britain is limited to a maximum output of 800W.
- • Savings depend heavily on how much electricity you use during daylight hours.
- • Permission may be required if you rent, lease or live in a managed building.
UK plug-in solar prices move with panel supply, exchange rates and retailer promotions. Tracking them stops you paying peak-season prices.
What kits cost now
- 400W portable panel with stand: £250-£420
- 600W two-panel garden kit: £450-£650
- 800W balcony or roof kit with microinverter: £600-£950
Mounting hardware adds £40-£120 depending on type, and an electrician typically charges £120-£250 for a connection point.
Why prices move
Spring and early summer are peak demand and rarely bring the best deals. Late autumn clearance and post-Christmas sales are usually cheaper. Import costs and shipping affect marketplace sellers most.
Cost per watt as a sanity check
Divide the total price by the inverter output. Under £1.00 per watt is competitive for a complete UK kit with mounting. Above £1.40 per watt you are paying a premium — check what extra you are getting.
How our tracker works
We record retailer prices with the date checked and keep the history so you can see whether a discount is real. Availability and in-stock status are recorded alongside price.
Frequently asked questions
Fact-check status: reviewed. Read our editorial policy. General information only — not electrical, legal or financial advice.