What is a ground-mounted solar system?
A ground-mounted system uses a steel or aluminium frame structure anchored into the ground — either with concrete footings, ground screws, or ballasted frames — to hold panels at a fixed or adjustable angle. The panels connect to an inverter inside the house via a DC cable run through underground conduit.
Systems range from small supplementary arrays of 4–6 panels up to large whole-property systems of 30+ panels. Because you are not limited by roof space or orientation, a ground-mounted system can often be sized to meet your full electricity demand where a roof system cannot.
Advantages over roof-mounted systems
Optimal orientation and angle: you choose where to place the array, so south-facing at 30–35° (ideal for the UK) is always achievable. Roof systems are constrained by the existing roof pitch and orientation.
Easier cleaning and maintenance: panels at ground level or reachable from the frame are far simpler to clean safely. Water-fed pole cleaning is straightforward and does not require working at height.
No roof penetrations: ground-mounted systems do not require drilling through the roof membrane, eliminating any risk of water ingress or structural disturbance to the building fabric.
Expandability: adding more panels to a ground-mounted array is typically easier than extending a roof installation.
Disadvantages and practical constraints
Land requirement: a 4 kW system needs roughly 20–30 m² of ground space, plus a clear southern aspect with no shading. Properties with small or heavily shaded gardens are not suitable.
Planning permission: in most cases, ground-mounted solar panels are not permitted development and do require planning permission. The rules depend on panel height, proximity to boundaries, and whether the property is in a conservation area. Always check with your local planning authority before installing.
Cable run cost: the underground conduit from the array to the inverter adds labour cost. A 20–30 m run is typical for a domestic property and adds £300–£600 to installation.
Visual impact and security: ground-mounted arrays are visible from the garden and potentially from the street. They are also slightly more accessible to opportunist theft than roof systems.
Costs compared to roof systems
Ground-mounted systems typically cost 15–25% more than an equivalent roof installation, primarily due to the frame structure and cable run. A 4 kW ground-mounted system in the UK currently costs £7,000–£9,500 fully installed, compared to £5,500–£7,500 for a roof equivalent.
The higher upfront cost is often offset by the performance advantage of perfect orientation — a south-facing 30° ground array in the UK will outperform a poorly oriented roof system by 10–20% in annual yield, improving the payback calculation.
Cleaning ground-mounted panels
One practical benefit that is often underestimated: ground-mounted panels are significantly easier and cheaper to clean. No scaffolding, no working at height, no need for a specialist roof-access operative. A standard water-fed pole clean is straightforward and costs less than the equivalent roof visit.
Ground-level exposure does mean panels pick up more splash-back from rain on soil, and lower-angled panels accumulate more detritus from leaves and garden debris. Cleaning two or three times a year (rather than once) is worth considering for ground-level systems in leafy or rural locations.