# How to install solar panel uk? ![David Coleman](/uploads_resolved/images/261/320.webp) [David Coleman](/authors/david-coleman/ "Author profile for David Coleman")Founder & Renewable Energy Author, kilowatts.uk # How to install solar panel uk? **Published:** 2026-07-19 19:32:11 **Updated:** 2026-07-25 14:58:01 To install solar panels in the UK, start by checking whether your roof is suitable, get quotes from qualified installers, complete a proper survey and… [ Preferred on Google](https://www.google.com/preferences/source?q=https://kilowatts.uk) ## How to install solar panels in the UK To install solar panels in the UK, start by checking whether your roof is suitable, [get quotes from qualified installers](/services/residential/renewable-energy/residential-solar-panel-installation/compare/), complete a proper survey and system design, confirm planning, building regulations and DNO requirements, then have the system fitted, tested and commissioned. For a normal grid-connected home system, most homeowners should use an [MCS-certified installer](https://kilowatts.uk/resources/what-does-mcs-certification-mean-for-uk-solar-installations/ "what does mcs certification mean for uk solar installations") rather than attempting DIY installation. That is because solar PV installation is not just “putting panels on a roof”. It involves working at height, roof fixings, weatherproofing, DC electrical safety, grid connection rules, certification, warranties and export payments. In the UK, “solar panels” usually means solar photovoltaic panels, or solar PV. These generate electricity from daylight. They are different from solar thermal panels, which heat water. A typical UK solar PV system is grid-connected. Your home uses solar electricity first, imports from the grid when needed, and may export surplus electricity when generation is higher than household demand. The best design depends on your roof, electricity use, budget, shading, local network limits and whether you want a battery. A simple grid-connected system looks like this: Daylight ↓ Solar panels on roof ↓ DC electricity Inverter ↓ AC electricity Home consumer unit ─── Home appliances ↓ surplus electricity Electricity grid / export tariff ``` If a battery is included, it usually sits between the inverter system and the home’s electrical supply, storing some surplus solar electricity for later use. ## Short summary of the installation route A good solar installation is a roof project, an electrical project and a paperwork project at the same time. The best results usually come from resolving all three before scaffold goes up. The typical route is: The physical installation often takes 1 to 3 days for a straightforward home, but the full process from quote to commissioning can take 2 to 8 weeks. DNO approval, roof repairs, planning issues, scaffold complexity or access problems can extend this. ## Step by step installation process The first step is a suitability check. The installer should look at roof size, roof type, orientation, pitch, shading, access and the condition of tiles, slates or other roof coverings. They should also ask about your electricity use, whether you are at home during the day, and whether you plan to add an electric vehicle, battery or heat pump. A basic pre-installation checklist looks like this: - Is the roof structurally sound and likely to last for many years? - Is there enough usable roof area for the proposed number of panels? - Is the roof shaded by chimneys, trees, dormers or neighbouring buildings? - Is the consumer unit suitable, or will electrical upgrades be needed? - Is there a practical route for cables from the roof to the inverter? - Is there a suitable location for the inverter and, if included, battery? The installer then designs the system. This includes the number of panels, total kWp capacity, inverter size, string layout, cable routes, isolator positions, monitoring and any battery integration. On shaded roofs, the design may include optimisers or microinverters to reduce the impact of partial shading. Before installation, the installer should check permissions and notifications. Many domestic roof-mounted solar PV systems are permitted development, but listed buildings, conservation areas, flats, maisonettes, National Parks, protected landscapes and some ground-mounted systems can need extra checks. Building regulations still apply even where planning permission is not required. For the installation itself, scaffold is usually erected first. The roof team then locates rafters and fixes roof hooks or brackets into structural timber, not just battens. Mounting rails are attached to those fixings, tiles are refitted or flashed correctly, and panels are clamped to the rails. The electrical work follows the designed route. DC cabling runs from the panels to the inverter, and AC cabling connects the inverter to the consumer unit. The installer fits isolators, labels, monitoring equipment and any CT clamps needed to measure import and export. Finally, the system is tested, commissioned and handed over with certificates, warranties and user guidance. In simple terms, the installation day sequence is usually: Scaffold → Roof fixings → Mounting rails → Panels → DC cabling → Inverter → AC connection → Testing → Commissioning → Handover ``` For many homeowners, the most important point is this: the final design should be confirmed after a proper survey, not based only on a sales estimate. Will the system need DNO approval before installation? Will planning restrictions apply? ## Can you install solar panels yourself in the UK DIY solar can be possible for small off-grid applications, such as a shed, campervan or remote low-voltage system. It is usually not practical for a normal grid-connected home installation. Working at height is dangerous. Solar DC circuits can remain live in daylight. Poor roof fixings can cause leaks or structural damage. Incorrect electrical work can create fire, shock or insurance risks. The bigger issue is compliance. A grid-connected solar PV system needs correct electrical design, safe commissioning, DNO notification or approval, and suitable certification. Many energy suppliers require an MCS certificate before they will pay Smart Export Guarantee payments. A DIY system may also create problems with home insurance, mortgage enquiries or selling the property later. Common DIY risks include: Unsafe roof access and inadequate fall protection Incorrect roof fixings that cause leaks Poor DC connections that increase arcing risk Incompatible connectors or badly crimped cables Missing labels, certificates or commissioning records No MCS certificate for export tariff applications For most homeowners, the sensible route is to choose a competent installer and scrutinise the design and quote carefully. DIY is not where most people should try to save money on a grid-tied solar PV system. No clear warranty route if equipment or workmanship fails Difficulty proving compliance during a future house sale ## Planning permission, building regulations and DNO approval Many domestic solar panel installations in the UK fall under permitted development, so [planning permission](https://kilowatts.uk/resources/do-i-need-planning-permission-for-solar-panels-in-the-uk/ "do i need planning permission for solar panels in the uk") is often not required. However, this is not automatic in every case. Extra checks may be needed if the property is: - Listed - In a conservation area - In a National Park or protected landscape - A flat or maisonette - A building with unusual roof arrangements - A property with restrictive leasehold or freehold conditions Planning permission is separate from building regulations. Even if planning permission is not required, the installation must still be structurally and electrically safe. The roof must be able to carry the load, fixings must resist wind uplift, and the weatherproofing must not be compromised. DNO requirements are another separate matter. The DNO is the Distribution Network Operator, which manages the local electricity network. Smaller systems often follow G98 rules, while larger systems usually need G99 approval before installation. A common G98 limit is 16 amps per phase, roughly 3.68 kW AC on a single-phase supply. The inverter AC rating is what usually matters for that limit, not just the panel capacity. A helpful way to separate the paperwork is: Some homes can have more panel capacity than inverter capacity, and some systems use export limitation. That can be a valid design approach, but it must be properly specified, certified and commissioned. Your installer should handle the DNO paperwork, but you should still keep the DNO confirmation documents in your handover pack. Using a ground-mounted array rather than roof-mounted panels ## How much does it cost to install solar panels in the UK Typical installed prices vary by system size, equipment, roof complexity, scaffold requirements and whether a battery is included. As a broad guide, a 3 kWp solar PV system often costs around £5,000 to £7,000 installed, a 4 kWp system around £6,000 to £8,500, a 5 kWp system around £7,000 to £10,000, and a 6 kWp system around £8,500 to £12,000. A home battery often adds around £3,000 to £8,000, depending on usable capacity, brand, power output, installation complexity and whether backup functionality is included. These are broad market ranges, not a guarantee. Actual prices can move with equipment costs, labour availability, roof access and specification. Always compare current quotes for your property rather than relying on a national average. Typical cost ranges are: Scaffold is usually included in a full installation quote, but you should check this explicitly. Bird protection mesh can add several hundred pounds, and roof repairs before installation will increase the total project cost. Costs are affected by: Roof type and access difficulty Number of roof faces used Shading and optimiser requirements Inverter and battery specification Consumer unit or earthing upgrades Scaffold complexity Be careful when comparing supply-only equipment prices with installed prices. A proper installed quote includes design, access equipment, labour, electrical work, testing, certification, commissioning, warranties and handover documents. Domestic solar installations are usually zero-rated for VAT when installed by a contractor under current UK rules, but VAT rules can change, so confirm how VAT is treated in your quote. Bird protection and cable routing Planning or structural complications Whether the inverter and battery location needs extra work Whether export limitation or three-phase equipment is needed ## What size solar system do you need System size is normally quoted in [kWp](/blog/what-is-kwp-in-solar-panel), which is the peak capacity of the panels. A small UK home system is often 2 to 3 kWp, a medium system is often 3.5 to 4.5 kWp, and a larger domestic system is often 5 to 6 kWp. Large roofs may support 7 kWp or more, subject to design and network constraints. A 400 W panel has a capacity of 0.4 kWp, so a 4 kWp system may use around 10 panels. A 5 kWp system may use around 12 to 13 panels. Modern panels are often around 1.7 to 2.0 square metres each, so usable roof area matters. A simple sizing guide is: These generation figures use a broad UK range of around 850 to 1,100 kWh per kWp per year. Output is usually higher in southern England than northern Scotland, higher from March to September, and much lower in winter. Solar panels still work on cloudy days, but they generate little or no electricity at night. The best system is not always the largest system that fits. It should reflect how much electricity you use, when you use it, export limits, battery plans, roof orientation and your budget. If most of your electricity use is in the evening, a battery may improve self-consumption, but it does not increase generation and it can lengthen payback if it is expensive. For example: - A retired couple at home during the day may use a high share of solar electricity directly, so a solar-only system may work well. - A household out all day with high evening use may export more electricity unless they add a battery or shift appliance use. - A home planning an EV may benefit from a larger array, but only if charging patterns and export limits are considered. - A heat pump home may use more electricity in winter, when solar output is lowest, so the system should be modelled realistically. A good installer should estimate annual generation and explain the assumptions behind self-consumption, export value and payback. Be cautious with quotes that assume you will use nearly all generated electricity without explaining how. ## Roof suitability and design details installers should check A south-facing roof usually produces the most annual electricity, but east-facing and west-facing roofs can still work well. East-facing panels generate more in the morning, while west-facing panels generate more in the afternoon. North-facing roofs usually produce much less electricity and need careful financial assessment. A simple orientation guide is: Roof condition is just as important as orientation. If a roof needs replacement soon, it is usually better to repair or re-roof before installing panels. Removing and refitting panels later adds cost and disruption. Important roof checks include: The age and condition of tiles, slates or roof covering Whether rafters and structure can support the system Shading from chimneys, trees, dormers and neighbouring buildings Safe edge distances and access routes Wind uplift exposure, especially near roof edges Cable routes into the building Different roof types need different fixing methods. Concrete tile roofs are common and usually straightforward. Clay tiles can be more fragile. Slate roofs often need more careful fixings or flashing. Metal standing seam roofs may use clamps without roof penetrations. Flat roofs need tilted frames and may require structural checks because ballasted systems can add significant point loads. Shading deserves special attention. Even a small shaded area can reduce output if the system is poorly designed. Common shading sources include chimneys, dormer windows, aerials, satellite dishes, trees and neighbouring rooflines. Optimisers or microinverters can help in some cases, but they are not a magic fix for a badly shaded roof. The installer should show how shading has been allowed for in the generation estimate. Whether bird protection is sensible at installation stage Whether the loft or roof void gives safe access for inspection Whether the roof has asbestos-containing materials Whether the property has unusual construction or previous alterations ## Solar-only or solar with a battery A battery is not required for solar panels to work. Solar-only systems can still reduce daytime grid imports and export surplus electricity. A battery stores some daytime solar generation for later use, usually in the evening, and can increase the share of solar electricity used in the home. The decision depends on your usage pattern. A battery is more likely to make sense where daytime generation would otherwise be exported and evening demand is high. It may be less attractive if you already use most electricity during daylight, have a small solar system, or receive a strong export tariff. A simple comparison is: Key battery points are: - ### Location Batteries need suitable temperatures, access and ventilation, and some are not suitable for unheated outbuildings. - ### Power rating This affects how many appliances the battery can support at once. - ### Warranty terms Battery warranties often depend on both years and charge cycles. - ### Usable capacity Battery capacity is quoted in kWh, but usable capacity can be lower than nominal capacity. - ### Backup operation Standard solar and battery systems do not always power a home during a power cut unless backup equipment and wiring are included. - ### Tariff compatibility Some batteries can charge from cheap off-peak electricity, but savings depend on the tariff and usage pattern. If you are planning an EV or heat pump, tell the installer early. Smart EV charging, immersion diverters and heat pump usage can change the best solar and battery design. Future expansion — Not every inverter or battery system is easy to expand later. ## How to compare solar installer quotes A good solar quote should be detailed enough for you to understand what is being installed and what assumptions sit behind the savings estimate. A cheap quote that omits scaffold, certification, monitoring or consumer unit work may not be cheaper once everything is included. Ask each installer for: Total solar capacity in kWp Inverter capacity in kW Estimated annual generation in kWh Panel, inverter and battery model details Roof layout drawing Shading assumptions Quotes based only on satellite images can miss fragile tiles, roof defects, awkward access or cable routing problems. A proper survey, either physical or detailed remote, reduces the chance of last-minute changes. Be cautious if a quote focuses only on the number of panels. The more useful figures are system kWp, inverter capacity, expected generation, self-consumption assumptions and total installed cost. A practical quote comparison table can help: The cheapest quote is not automatically the worst, and the most expensive quote is not automatically the best. Look for clear design logic, named equipment, realistic assumptions and complete paperwork. Scaffold inclusion DNO paperwork inclusion MCS certification inclusion Warranty details for panels, inverter, battery and workmanship Whether consumer unit upgrades are needed Monitoring and handover details Assumed self-consumption percentage Assumed export tariff and import tariff Whether bird protection is included Whether any roof repairs are excluded Payment schedule and cancellation terms ## Example installation scenarios The following examples show how different UK homes can need different solar designs. They are illustrative, not promises of savings or performance. ## Example 1: South-facing semi-detached house A three-bedroom semi-detached home has a sound south-facing concrete tile roof with little shading. The household uses electricity during the day because one person works from home. A typical design might be a 3.5 to 4.5 kWp solar-only system, subject to roof space and inverter limits. Because daytime usage is reasonably strong, the household may use a good portion of generation directly. A battery could still be considered, but it should be compared carefully against export payments and the extra upfront cost. The key design checks are roof condition, scaffold access, inverter location and DNO notification. ## Example 2: East-west roof with evening electricity use A detached home has roof space split between east and west faces. The household is mostly out during the day and uses more electricity in the evening. An east-west design may generate less at peak midday than a south-facing system, but it can spread generation across the morning and afternoon. A battery may improve self-consumption if a lot of daytime generation would otherwise be exported. The key design checks are whether both roof faces can be connected efficiently, whether shading affects one side, and whether the battery size is justified by actual evening demand. ## Example 3: Older roof in a conservation area A period property has an older slate roof and is located in a conservation area. The roof is not in immediate failure, but some slates are fragile. This home needs extra caution before installation. Planning rules should be checked before committing. The roof may need repairs first, and the fixing method should be suitable for slate. A cheap standard tile-roof quote would not be enough detail for this property. The key design checks are planning position, roof condition, fixing method, scaffold access and whether the visual impact is acceptable. ## Example 4: Home planning an EV and heat pump A larger home expects electricity demand to rise because the owner is planning an electric vehicle and heat pump. It may be sensible to design solar with future loads in mind, but winter heat pump demand will not be fully matched by solar because UK solar output is much lower in winter. EV charging can work well with solar if the car is home during daylight or smart charging is used. The key design checks are future electricity use, charger location, battery compatibility, export limits and whether the consumer unit needs upgrades. ## Documents you should receive after installation The handover pack is important. It proves what has been installed, supports warranty claims, helps with future maintenance, and may be needed for export tariff registration, insurance or a future house sale. You should expect documents such as: MCS certificate DNO notification or approval Electrical installation certificate Building regulations compliance certificate where applicable Inverter commissioning record Panel and inverter warranty documents Keep digital and paper copies if possible. If anything is missing, ask for it before making the final payment. For export payments, your energy supplier may ask for the MCS certificate, DNO evidence, MPAN details and proof of installation. Requirements vary by supplier, so check before assuming you are ready to register. Battery warranty documents if a battery is installed System schematic and user manuals Monitoring login details Maintenance guidance Emergency shutdown instructions Installer contact details Final roof layout and equipment schedule Export limitation settings, if used ## Common mistakes to avoid One common mistake is installing solar on a poor roof. Panels can last for decades, so fitting them over tiles or slates that need replacing soon is false economy. Roof repairs are usually easier before the solar array is fitted. Another mistake is assuming planning, DNO approval and export registration are the same thing. They are separate steps. Planning relates to local development rules, the DNO relates to the electricity network, and export registration relates to getting paid by an energy supplier for exported electricity. Other mistakes include: Oversizing the system without considering export limits Accepting savings estimates that rely on unrealistic self-consumption Placing an inverter in a loft that becomes too hot in summer Ignoring partial shading from chimneys, trees or dormers Assuming standard solar will power the home during a power cut Forgetting to check whether scaffold is included In most grid-tied installations, the system shuts down during a power cut unless specific backup equipment is installed. This is a safety requirement to protect people working on the electricity network. Bird nesting is also worth considering. Bird mesh is often easier and cheaper to fit during installation than after the system is in place. Not asking whether consumer unit upgrades are required Choosing a battery without checking usable capacity and power rating Failing to keep certificates and warranty documents Waiting until after installation to think about bird protection ## Common misconceptions about solar panel installation in the UK Solar is now familiar to many UK homeowners, but several misconceptions still cause confusion. The safest approach is to ask installers to explain their assumptions in plain English. If the design is sound, they should be able to show why the roof layout, inverter, battery and estimated savings make sense for your home. ## Is solar panel installation suitable for your home Solar PV suits many UK homes with sound, reasonably unshaded roof space and moderate to high electricity use. It is often especially worth considering if you use electricity during the day, work from home, plan an electric vehicle, or expect to install a heat pump. It may be less suitable if your roof is heavily shaded, needs near-term replacement, has unsafe access, or is affected by listed building restrictions. It may also be less suitable if you expect to move very soon and are focused only on short payback. A quick suitability check is: The right next step is to [compare proper installed quotes](/services/residential/renewable-energy/residential-solar-panel-installation/compare/), not just panel prices. Look for clear design assumptions, realistic generation estimates, certification, DNO handling, warranties and a practical explanation of how the system will connect to your home. You can also [book a free home energy survey](https://kilowatts.uk/booking/?kwrf=8SA53&kwpid=6&kwlid=9) to check whether solar is a practical fit for your property. Tags: [Solar panel installation uk](/tags/solar-panel-installation-uk/ "Solar panel installation uk")[Uk renewable energy](/tags/uk-renewable-energy/ "Uk renewable energy")[Home solar power uk](/tags/home-solar-power-uk/ "Home solar power uk")[Solar panel efficiency](/tags/solar-panel-efficiency/ "Solar panel efficiency")[Mcs certification](/tags/mcs-certification/ "Mcs certification")[Uk solar panel grants](/tags/uk-solar-panel-grants/ "Uk solar panel grants")[Solar storage solutions](/tags/solar-storage-solutions/ "Solar storage solutions")[Uk solar panel costs](/tags/uk-solar-panel-costs/ "Uk solar panel costs")[Panel installation](/tags/panel-installation/ "Panel installation")[Uk renewable energy systems](/tags/uk-renewable-energy-systems/ "Uk renewable energy systems") [ Preferred on Google](https://www.google.com/preferences/source?q=https://kilowatts.uk) ## Plan, Compare & Buy Renewable Energy Solutions AI does the thinking. You get the perfect solar match. 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Simply enter your postcode, drop a pin on your roof, create your free account and let RoboMo™ analyse your property to find the best solar panels for your home. ![You don't have to think](/uploads_resolved/images/322/320.webp) #### You don't have to think RoboMo™'s AI analyses your roof and does all the hard work. ![Accurate & tailored](/uploads_resolved/images/320/320.webp) #### Accurate & tailored AI-powered assessment based on your roof, location, and conditions. ![Best options, maximum savings](/uploads_resolved/images/323/320.webp) #### Best options, maximum savings Compare top solar panels for the best performance and value. ![Simple, fast & effortless](/uploads_resolved/images/319/320.webp) #### Simple, fast & effortless Provide a few details, sit back and watch your results unfold. ![Media image](/uploads_resolved/images/318/320.webp) ![Media image](/uploads_resolved/images/329/320.webp) STEP 1 #### Choose Home, Business or Industrial Enter your postcode to start your assessment. - Home - Business - Industrial It's fast, free and effortless. 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[Become A Flower Turbines Partner](mailto:dcoleman@flowerturbines.com?subject=Flower%20Turbines%20Partnership%20Enquiry) ## Related articles [ ![What is an 800W solar panel and how efficient is it?](/uploads_resolved/images/436/320.webp) ### What is an 800W solar panel and how efficient is it? Understand 800w solar panel in the UK, with clear explanations, examples, and practical next steps. ](/resources/what-is-an-800w-solar-panel-and-how-efficient-is-it/ "What is an 800W solar panel and how efficient is it?") [ ![PPA vs Buying Commercial Solar in the UK: A Decision Framework](/uploads_resolved/images/451/320.webp) ### PPA vs Buying Commercial Solar in the UK: A Decision Framework Discover when to choose a PPA or purchase commercial solar panels for your UK business, considering factors like upfront cost, lifetime savings, maintenance re… ](/resources/ppa-vs-buying-commercial-solar-in-the-uk-a-decision-framework/ "PPA vs Buying Commercial Solar in the UK: A Decision Framework") [ ![Commercial Solar Finance in the UK: A Comprehensive Guide](/uploads_resolved/images/448/320.webp) ### Commercial Solar Finance in the UK: A Comprehensive Guide Learn about commercial solar finance options in the UK, including loans, asset finance, PPAs, leases, grants, and tax relief. Understand the key principles, be… ](/resources/commercial-solar-finance-in-the-uk-a-comprehensive-guide/ "Commercial Solar Finance in the UK: A Comprehensive Guide") [ ![Commercial solar payback calculator in the UK](/uploads_resolved/images/469/320.webp) ### Commercial solar payback calculator in the UK Find out commercial solar payback calculator in the UK, including costs, what affects price, and how to choose an installer. ](/resources/commercial-solar-payback-calculator-in-the-uk/ "Commercial solar payback calculator in the UK") ## Frequently Asked Questions ### How do you install solar panels in the UK? To install solar panels in the UK, first check whether your roof is suitable, then get quotes from qualified installers, complete a survey and agree a final system design. Your installer should confirm planning, building regulations and DNO requirements before fitting the mounting system, panels, inverter, cabling and any battery. The system is then tested, commissioned and handed over with certificates, warranties and monitoring details. ### Should I use an MCS-certified solar installer? For most grid-connected home solar PV systems, you should use an MCS-certified installer. MCS certification helps show that the system has been installed to recognised standards and is commonly required by energy suppliers before they will pay Smart Export Guarantee export payments. It can also make warranty, insurance and future house sale questions easier to deal with. ### Can I install solar panels myself in the UK? DIY solar installation may be possible for small off-grid systems, such as a shed, campervan or remote low-voltage setup, but it is usually not sensible for a normal grid-connected home system. Domestic solar PV involves roof work, electrical safety, DC cabling, grid connection rules, testing and certification. A DIY grid-connected system may create safety risks and can make it harder to get export payments, prove compliance or satisfy insurers. ### Do I need planning permission for solar panels in the UK? Many domestic roof-mounted solar panel installations are permitted development, so planning permission is often not needed. However, you should check carefully if your property is listed, in a conservation area, in a National Park or protected landscape, a flat or maisonette, or if you are considering a ground-mounted system. Planning permission is separate from building regulations and DNO requirements. ### What building regulations apply to solar panel installation? Solar panel installations must be structurally and electrically safe. The roof must be able to carry the additional load, the fixings must resist wind uplift, weatherproofing must not be compromised, and the electrical work must be correctly designed, installed and tested. Your installer should explain how building regulations compliance will be handled and provide the relevant certificates after installation. ### What is DNO approval for solar panels? The DNO is the Distribution Network Operator responsible for the local electricity network. Grid-connected solar systems must either be notified to the DNO or approved by the DNO, depending on the inverter size and connection type. Smaller systems often fall under G98 rules, while larger systems usually need G99 approval before installation. A common G98 limit is 16 amps per phase, roughly 3.68 kW AC on a single-phase supply. ### How long does it take to install solar panels? The physical installation of a straightforward home solar system often takes 1 to 3 days once scaffold is in place. The full process from quote to commissioning usually takes longer, often around 2 to 8 weeks, because it includes surveys, design, scaffold booking, paperwork, DNO checks and any roof or electrical preparation. Planning issues, roof repairs or DNO approval can extend the timeline. ### How much does solar panel installation cost in the UK? As a broad guide, a 3 kWp solar PV system may cost around £5,000 to £7,000 installed, a 4 kWp system around £6,000 to £8,500, a 5 kWp system around £7,000 to £10,000, and a 6 kWp system around £8,500 to £12,000. A home battery can add around £3,000 to £8,000 depending on capacity, specification and installation complexity. Actual prices depend on the roof, equipment, scaffold, electrical work and whether extras such as bird protection are included. ### What size solar panel system do I need? The right system size depends on your roof space, electricity use, budget, shading, export limits and whether you want a battery. A small UK home may suit 2 to 3 kWp, a typical family home may suit around 3.5 to 4.5 kWp, and larger homes may consider 5 to 6 kWp or more if the roof and grid connection allow it. A good installer should model expected annual generation and explain the assumptions behind self-consumption and savings. ### How many solar panels are needed for a 4 kWp system? A 4 kWp system typically uses around 10 panels if each panel is rated at 400 W. The exact number depends on the panel wattage, roof layout, shading and safe spacing around roof edges. Modern panels are often around 1.7 to 2.0 square metres each, so usable roof area is a key part of the design. ### Is my roof suitable for solar panels? A suitable roof is usually structurally sound, not due for replacement, reasonably unshaded and large enough for the proposed array. South-facing roofs usually generate the most electricity, but south-east, south-west, east and west roofs can also work well. Roof condition, shading from chimneys or trees, cable routes, access, wind exposure and the type of tiles, slates or roof covering all need to be checked before installation. ### Can solar panels be installed on an east or west-facing roof? Yes, east and west-facing roofs can be suitable for solar panels. East-facing panels generate more electricity in the morning, while west-facing panels generate more in the afternoon and early evening. They may produce less annual electricity than a strong south-facing roof, but they can still be worthwhile, especially if their generation matches when the household uses electricity. ### Should I repair my roof before installing solar panels? If your roof is likely to need repair or replacement soon, it is usually better to complete that work before installing solar panels. Panels can last for decades, and removing and refitting them later adds cost and disruption. A good installer should flag cracked tiles, fragile slates, weak roof structure or other roof issues before finalising the design. ### Do I need a battery with solar panels? No, a battery is not required for solar panels to work. A solar-only system can reduce daytime grid imports and export surplus electricity. A battery stores some surplus solar generation for later use, usually in the evening, which can increase self-consumption. Whether it is financially worthwhile depends on your usage pattern, battery cost, export tariff, import tariff and whether you can use cheap off-peak electricity. ### Will solar panels power my home during a power cut? Most standard grid-connected solar PV systems shut down during a power cut for safety reasons. This prevents electricity being exported to the grid while engineers may be working on the network. If you want backup power, you need a system specifically designed with backup functionality, suitable battery storage and the correct electrical arrangement. ### What documents should I receive after solar panel installation? You should receive a handover pack that includes your MCS certificate, DNO notification or approval evidence, electrical installation certificate, warranty documents, system schematic, equipment manuals, monitoring details, commissioning information and emergency shutdown instructions. If a battery is installed, you should also receive the battery warranty and operating documents. Keep these records for export tariff applications, warranty claims, insurance and future property sale enquiries. ### What should I check when comparing solar quotes? Compare more than the number of panels and headline price. Check the total system size in kWp, inverter size, estimated annual generation, named panel and inverter models, battery usable capacity if included, scaffold costs, DNO handling, MCS certification, warranties, monitoring, roof layout, shading assumptions and whether consumer unit upgrades are included. A good quote should explain the design clearly and use realistic savings assumptions. ### Are solar panels worth it in the UK? Solar panels can be worthwhile for many UK homes, especially where the roof is suitable and the household uses a reasonable amount of electricity during the day. Savings depend on system cost, generation, self-consumption, import prices, export payments and whether a battery is included. Solar output is seasonal in the UK, with higher generation in spring and summer and much lower generation in winter, so quotes should model performance realistically. ### Do solar panels work on cloudy days in the UK? Yes, solar PV panels generate electricity from daylight, not heat, so they can still work on cloudy days. Output is lower in dull conditions than in bright sun, and panels do not generate electricity at night. UK solar generation is strongest from March to September and weakest in winter. ### Is bird protection worth fitting during solar installation? Bird protection mesh can be worth considering, especially in areas where pigeons are common. Birds can nest under panels, causing noise, mess and potential maintenance issues. It is often easier and cheaper to fit bird protection during the original installation than to add it later after scaffold has been removed.