Solar System Costs by Size
The right solar system size depends on your roof, electricity use and plans for battery storage. We’ll compare 4kW, 5kW and 10kW options, explain the installation cost for your home, and help you choose a practical route.
What to consider before choosing a solar system size
Several practical details can alter the right specification: roof access, usable space, shading, existing electrics, export arrangements and future battery plans. We consider these constraints before you compare prices, so the figures reflect a workable installation.
Start with the electricity you use
A larger array costs more but may not suit a home with modest daytime demand. We compare your electricity use with the likely generation before recommending a system size.
Check the usable roof area
Roof windows, dormers, chimneys and separate roof pitches can reduce the panel layout. We measure the usable sections rather than pricing from total roof dimensions.
Account for shade across the day
Trees, neighbouring buildings and chimneys can affect different panels at different times. We assess the shading pattern so the quoted system reflects the roof’s actual output.
Allow for battery storage
A battery can change the value of adding more panels, particularly when your home uses most electricity in the evening. We price the solar array and storage together when that is your plan.
Include the electrical work
The price may need to include consumer unit changes, cable routes, protective equipment or other work to connect the array safely. We identify these requirements during the survey rather than adding them later.
Consider access and installation work
A roof over a conservatory, steep access or limited space for equipment can affect the installation method and labour involved. We include the practical access arrangements in the quotation.
Plan for exported electricity
If the system will export surplus generation, the inverter and paperwork need to suit that arrangement. Our MCS-certified installers can make the installation eligible for the Smart Export Guarantee.
How Solar System Size Affects Cost and Value
A 4kW system may suit lower electricity use, while 5kW offers more generation without the roof space of 10kW. A larger array can support higher demand, but costs more and needs careful export and battery planning.
4kW solar system
A 4kW array can suit a smaller roof or lower electricity use. It usually keeps the installation simpler and leaves more roof space for access and future changes. We price the panels, inverter, scaffolding and electrical work together so the quote reflects the whole installation.
5kW solar system
A 5kW system generates more electricity without the roof area needed for a 10kW array. It can suit a larger household or a home planning to add battery storage. We check the consumer unit, cable route and roof layout before confirming the cost.
10kW solar system
A 10kW array needs substantial suitable roof space and may produce more electricity than the property uses at some times. The design must account for export limits, inverter capacity and battery storage. We explain those costs before you commit to a larger system.
Roof size changes the price
A smaller roof may need higher-output panels or more careful positioning to reach the required size. Older, listed or barn-conversion properties can also need extra work around the roof structure and cable route. Our survey identifies these costs before the quotation is issued.
Battery and export planning
A larger array can increase unused generation if daytime demand is low. We compare battery storage and export options with the system size, so the design matches how the home uses electricity. MCS-certified installation allows us to handle the paperwork needed for the Smart Export Guarantee.
What a Well-Specified Solar System Should Include
A suitable array accounts for roof area, shading, orientation and electricity demand. We model these details, so the photovoltaic panel cost reflects what can actually be installed.
The quotation should separate the panels, inverter, mounting and electrical work. Where a battery is included, we explain its capacity and controls, so the total solar system price is clear before work begins.
A size matched to the roof
A 4kW, 5kW or 10kW system only works if the roof has enough usable space. We measure each roof face, check shading and account for orientation before recommending a size.
Output based on real electricity use
Your annual electricity demand and daytime usage affect the useful size of the array. We review your bills and plans, so the system is not priced around panels you cannot make practical use of.
A clear breakdown of cost
The price should show the panels, inverter, mounting system, electrical work and any access equipment separately. We set these costs out in the quotation before installation starts.
An inverter that suits the array
The inverter must match the panel layout, roof orientation and any future battery. We specify the controls needed to monitor generation and direct usable power around the home.
Battery capacity based on your routine
A battery is not automatically the right addition to every solar system. We compare your generation, evening demand and storage plans, then show how battery capacity changes the total price.
MCS-certified installation
Your solar system is installed by MCS-certified engineers, so we can make the relevant grant application on your behalf and support eligibility for the Smart Export Guarantee.
Electrical work included where needed
An older consumer unit, long cable run or limited connection point can affect the installation cost. We check the existing electrical system and include necessary work in the specification rather than leaving it unclear.
Questions to Ask Before Choosing a Solar System Size
How do you assess whether a solar system will suit an older home?
Bring recent electricity bills, roof plans and details of shading or future battery use. We’ll assess the property, explain assumptions and provide written costs before work begins, for clear comparison.
How disruptive is solar panel installation?
Most installations take place from the roof, with limited indoor work for the inverter and consumer unit. We protect floors, explain cable routes and remove packaging before leaving the property.
Does a larger solar system always cost less per kilowatt?
Not necessarily. A larger array may reduce installation costs per kilowatt, but roof complexity, scaffolding, electrical upgrades and unused generation can outweigh that advantage. We’ll compare outputs against demand carefully.
What affects the cost of a 10kW solar system with battery storage?
Costs rise with battery capacity, extra electrical work, scaffolding and roof complexity. We calculate usable storage against household demand, then show how each choice changes the final total system price.
How long does solar panel installation take?
Once the equipment is approved and scheduled, we confirm the planned installation period. Roof access, scaffolding, wiring and consumer-unit work affect duration; the quotation explains the programme clearly in advance.