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    How Many Solar Panels Are Needed to Run a House?

    The number of panels depends on your electricity usage, roof size, and panel efficiency. Here's a quick guide for UK homes.

    Solar Panels by House Size

    Property Annual Usage Panels System Size Cost
    1–2 bedroom flat 1,800–2,500 kWh 4–6 1.5–2.5 kW £3,500–£5,000
    2–3 bedroom semi 2,500–3,500 kWh 8–10 3–4 kW £5,000–£7,000
    3–4 bedroom detached 3,500–4,500 kWh 10–14 4–5.5 kW £6,500–£9,000
    4–5 bedroom large 4,500–6,000 kWh 14–20 5.5–8 kW £9,000–£13,000

    Key Factors That Affect Panel Count

    Electricity Consumption

    Check your annual kWh usage on your energy bill. Higher usage = more panels needed.

    Panel Wattage

    Modern panels are 400–430W each. Higher wattage panels mean fewer are needed.

    Roof Orientation

    South-facing roofs generate the most power. East/west roofs need 10–15% more panels.

    Shading

    Trees, chimneys, or neighbouring buildings reduce output and may require additional panels.

    Frequently Asked Questions

    How many solar panels do I need for a 3-bedroom house?

    A typical 3-bedroom house uses 2,900–3,500 kWh per year and needs 8–10 solar panels (a 3–4 kW system) to cover most of its electricity needs.

    Can solar panels power an entire house?

    Solar panels can generate enough electricity annually to match a household's total usage. However, you'll still draw from the grid at night unless you add battery storage. With a battery, self-sufficiency can exceed 70%.

    How many solar panels for a 4-bedroom house?

    A 4-bedroom house typically uses 3,500–4,500 kWh per year and requires 10–14 solar panels (4–5.5 kW system), costing £6,500–£9,000 installed.

    Related Guides & Resources

    Find Out Exactly How Many Panels You Need

    Use our free estimator or request a no-obligation survey from our MCS-certified team.

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    Our Accreditations: HIES Consumer Code, TSI Approved Code, TrustMark Government Endorsed Quality, Green Deal Approved, MCS Certified, NAPIT

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