Frequently Asked Questions
Everything you need to know about solar PV
How much does a solar PV system cost?
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A typical 4kW residential system costs £5,000-£7,000 including installation. With the current 0% VAT rate (until 2027), this represents excellent value. Larger systems cost more but generate proportionally more electricity. We provide free, detailed quotes based on your specific roof and requirements.
How much can I save with solar panels?
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Typical savings are £500-£1,000+ per year depending on system size, electricity usage patterns, and how much you use during daylight hours. If you have a heat pump, EV, or work from home, savings can be significantly higher. Add battery storage to use more of your generated electricity and increase savings further.
Do solar panels work in cloudy weather?
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Yes! Solar panels work with daylight, not direct sunlight. They'll generate electricity on cloudy days, just at reduced output (typically 10-25% of peak). The UK gets enough daylight for solar PV to be highly effective—Germany, with similar weather, is one of the world's largest solar markets.
Which direction should panels face?
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South-facing is optimal, generating maximum output. However, east or west-facing roofs still work well (typically 80-85% of south-facing output) and can actually be better for self-consumption as they generate more in mornings or evenings. North-facing isn't recommended. We'll assess your roof and design the optimal layout.
Do I need planning permission for solar panels?
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Most residential solar PV installations are "permitted development" and don't require planning permission. Exceptions include listed buildings, conservation areas, and panels that protrude significantly from the roof. We'll advise if your property needs planning approval and can help with the application if required.
How long do solar panels last?
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Solar panels typically last 30-40 years or more. Most come with 25-year performance warranties guaranteeing at least 80% output after 25 years. Inverters usually need replacing once (after 10-15 years) during the system's lifetime. With no moving parts, there's very little that can go wrong.
What is the Smart Export Guarantee (SEG)?
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The SEG requires energy suppliers to pay you for electricity you export to the grid. Rates vary by supplier (typically 3-15p per kWh), with Octopus Energy's Outgoing tariff often offering the best rates. You'll need a smart meter to participate. We'll help you set this up after installation.
Should I add battery storage?
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Batteries let you store excess solar for use in evenings when electricity is most expensive. They're especially valuable if you have a heat pump, as you can run it on stored solar after dark. A typical 5kWh battery adds £2,500-£4,000 to the system cost. We can advise whether battery storage makes financial sense for your situation.
