Worth it, cost, roof direction, batteries, tariffs, grants by nation and the rules — dated answers with their sources, generated from the research knowledge base.
Possibly, but only until 31 December 2026 and only if your home is heated by a heat pump, high heat retention storage heaters or qualifying…
Read the answer →02Usually yes. Current EPCs, calculated with SAP and RdSAP, credit solar generation, so panels typically lift the score by several points. EPC…
Read the answer →03Charging an EV from surplus daytime solar is one of the best uses of it, using a solar-aware charger that follows export. Most drivers still…
Read the answer →04You normally keep it. Ofgem says a battery installed after the generation meter leaves both generation and 50% deemed export payments unaffected,…
Read the answer →05Yes, if you were accredited before the scheme closed to new applicants on 1 April 2019. Payments for generation and export continue for the rest…
Read the answer →06No. Great British Energy funds rooftop solar on schools, hospitals and other public buildings and, through the Local Power Plan published in…
Read the answer →07Not any more. Home Energy Scotland's grant and loan table, checked 24 September 2026, has no standalone solar PV or battery storage funding; new…
Read the answer →08Most money. Without an MCS certificate (or equivalent such as Flexi-Orb), suppliers need not pay you under the Smart Export Guarantee, and you…
Read the answer →09There is no general government solar grant in Northern Ireland, and the Smart Export Guarantee does not apply. NISEP funds limited low-income…
Read the answer →10Usually yes. For solar up to 50 kW, Ofgem says SEG applicants must show the installation and installer are certified - normally an MCS…
Read the answer →11The SEG obliges large electricity suppliers to offer a tariff paying for solar you export, at any rate above zero. Basic SEG rates checked on 24…
Read the answer →12SEG requires larger electricity suppliers in Great Britain to offer a tariff for electricity you export from solar systems up to 5 MW. The rate is…
Read the answer →13Batteries pay most on time-of-use tariffs with cheap overnight or off-peak windows. Checked 24 September 2026: Octopus Go charges about 8.6p from…
Read the answer →14If you were planning it anyway, installing before 1 April 2027 avoids the 5% VAT due to return then, saving about £300 on a £6,500 system.…
Read the answer →15Yes, until 31 March 2027. Since 1 February 2024, batteries installed in homes are zero-rated whether fitted with new solar, retrofitted to an…
Read the answer →16No, not if they are installed in your home before 1 April 2027. Solar panels, cabling, inverter and installation are zero-rated across Great…
Read the answer →17Possibly through Nest, the Welsh Government's free home upgrade scheme for low-income owner-occupiers and private tenants. Homes normally need an…
Read the answer →18Yes. The Warm Homes Loan Scheme subsidises lenders to cut interest on loans for solar and batteries, sometimes to 0%, with a consumer launch phase…
Read the answer →19In England, yes if you qualify for the Warm Homes: Local Grant: a privately owned home rated EPC D to G and household income of £36,000 or less,…
Read the answer →20Panels keep generating and batteries keep running their last settings, but the app stops updating, tariff-driven schedules and firmware updates…
Read the answer →21MCS installers estimate first-year output as system size (kWp) × a kWh-per-kWp figure for your postcode zone, roof direction and pitch × a shading…
Read the answer →22Yes for solar-charged electricity. Ofgem says suppliers must pay SEG on battery export that can be guaranteed to come from your panels. If the…
Read the answer →23Usually yes, by shifting surplus solar into the evening. MCS tables show a 4–5 kWh battery lifts self-consumption from about 25% to 63% for a…
Read the answer →24A solar diverter sends surplus electricity to an immersion heater, costs a few hundred pounds and is worth it if you have a hot-water cylinder and…
Read the answer →25Not on total energy per panel: an east-west array makes about 80% of what the same panels would make facing south. It can win on value, because…
Read the answer →26Solar panels have been covered by UK electrical-waste (WEEE) rules since 2014, so producers must finance collection and recycling of household…
Read the answer →27Solar you don't use or store as it's generated is exported. MCS lookup tables suggest a typical home with no battery uses only 15–39% of its solar…
Read the answer →28Systems above about 3.68 kW per phase need a G99 application, and where local cables or transformers are already full of solar the network…
Read the answer →29Yes, in practice. SEG payments need a meter that records half-hourly export with an export MPAN, which normally means a smart meter set up for…
Read the answer →30SEG only sets a floor above zero, so suppliers compete on price and conditions. Fixed rates pay the same for every unit; time-of-use export pays…
Read the answer →31No. Ofgem says your SEG licensee can be a different company from your import supplier. However, the best-paying export tariffs usually require you…
Read the answer →32Usually only with the freeholder's agreement, because the roof and walls normally belong to the freeholder or management company. Options are a…
Read the answer →33A south array draws a bell curve peaking around 1pm (BST). East arrays peak mid-morning and west arrays late afternoon, so an east-west system…
Read the answer →34There is no universal UK solar grant. Support depends on your nation, income and home: England's Warm Homes Plan funding for low-income households…
Read the answer →35Solar Together, now Switch Together, is a council-backed group-buying scheme run by iChoosr. Households register free, installers bid in an…
Read the answer →36Yes for hot water and spring and autumn heating, but less than people expect in winter, when heat pumps use most electricity and panels produce…
Read the answer →37Evidence suggests a modest premium for owned panels. A 2024 peer-reviewed study of about 5 million UK property records from Zoopla estimated a…
Read the answer →38Government statistics from MCS installations put the median at £1,595 per kW for systems up to 4 kW and £1,546 per kW for 4–10 kW (April…
Read the answer →39Use an MCS-certified installer that belongs to a consumer code such as RECC or HIES, and check both on their websites before signing and again…
Read the answer →40For most owner-occupiers with a reasonably sunny roof, yes. The Energy Saving Trust puts a typical 4.5 kWp system at about 7,600 pounds and…
Read the answer →41kWp (kilowatt peak) is the combined label rating of all panels under standard test conditions. MCS uses it to size your estimate: 10 × 450 W…
Read the answer →42Typically 25 to 30 years or more, gradually losing output rather than failing outright. Performance warranties now commonly run 25 to 30 years,…
Read the answer →43Panels typically last 25 years or more. Performance warranties usually promise 80–85% of rated power after 25–30 years; premium panels such as REC…
Read the answer →44Yes. A south-facing UK roof typically produces about 850 to 1,100 kWh a year per kilowatt of panels, from Scotland to the south coast. Nearly 1.7…
Read the answer →45Be careful. Many 2010 to 2016 'free' systems were roof leases lasting 20 to 25 years: the company kept the Feed-in Tariff and you got some free…
Read the answer →46Usually not for a house. Roof panels are normally permitted development, with limits on how far they stick out and extra rules for listed…
Read the answer →47Not if installed properly. Roof hooks fit under the tiles into the rafters and the covering stays weathertight; many flat-roof systems are…
Read the answer →48No. South is best per panel, but east and west roofs still produce about 80% as much and spread generation across the day. Even a shallow north…
Read the answer →49From 24 March 2027 in England, new homes must include on-site renewable electricity, normally solar panels covering the equivalent of 40% of the…
Read the answer →50Some do. Inverters and batteries can hum or whine under load and fans run in hot weather or while charging hard; backup gateways can buzz from…
Read the answer →51Sometimes. On a shallow north roof panels can make around 70% of a south roof's output, falling to under half on steep roofs. Winter output is…
Read the answer →52Per panel, south is best. MCS tables put a 35° east or west roof at about 78–82% of south, south-east/south-west about 94%, and north only 51–59%.…
Read the answer →53South gives the most energy per panel. East or west roofs produce about 15 to 20% less a year, and a north roof at a typical 30 to 35 degree pitch…
Read the answer →54Payback is the installed cost divided by the yearly benefit. The benefit is self-used kWh × import price plus exported kWh × export rate, less…
Read the answer →55Mixed. Hardware and installation prices have fallen, with MCS reporting average certified systems just over 7,000 pounds in 2025, but export rates…
Read the answer →56No grant or guaranteed export payment exists. Plug-in solar up to 800 W became legal in Great Britain on 27 August 2026, but kits are…
Read the answer →57Much less than a roof system. Output is capped at 800 W AC, and kits are often mounted vertically or partly shaded. MCS tables give a vertical…
Read the answer →58Jackery's EU manual says SolarVault 3 Pro Max plugs into a wall socket; output up to 2,500 W is enabled in the Jackery app only after a licensed…
Read the answer →59No, not on their own. Grid-tied inverters must switch off when the grid fails so they cannot feed power onto lines engineers are working on.…
Read the answer →60A clear itemised price; panel, inverter and battery make and model with datasheets; a roof layout drawing; an MCS performance estimate in kWh a…
Read the answer →61Be wary of cold callers, same-day discounts, pressure to sign in your home, claims that panels are 'free' or 'pay for themselves' on finance,…
Read the answer →62Plug-in solar became legal in Great Britain on 27 August 2026: one device up to 800 W that plugs into a socket and meets the government's product…
Read the answer →63Savings depend on how much solar you use yourself rather than export. Each unit you use avoids paying import prices, while exported units earn…
Read the answer →64A lot less. For a south-facing 35° roof in London, PVGIS 5.3 averages about 36 kWh per kWp in December against 123 in June and July, under a…
Read the answer →65Self-consumption is the share of your solar electricity used in your home rather than exported. It matters because each self-used unit saves the…
Read the answer →66Over a year, a typical system covers roughly a third to a half of a household's electricity. The rest comes from the grid, mainly in winter and at…
Read the answer →67MCS installers use a sun-path chart with 84 segments. Each segment blocked by trees or buildings on your southern horizon knocks 1% off the…
Read the answer →68Somewhere cool, dry, ventilated and easy to reach, close to the consumer unit to keep cables short, and away from bedrooms and escape routes.…
Read the answer →69Most UK homes fit 3.5 to 6 kWp, about 8 to 15 modern panels. Size to roof, budget and future use, not just current bills: panels are cheap…
Read the answer →70There is no universal solar grant. In England, low-income households in poorly rated homes can get free solar through the Warm Homes: Local Grant,…
Read the answer →71Tigo optimisers begin optimising as soon as they are connected, but Tigo requires full deployment with a Cloud Connect Advanced (CCA) and Tigo…
Read the answer →72With a battery, a time-of-use tariff lets you fill it cheaply overnight in winter and export solar at better rates in summer. Some owners switch…
Read the answer →73Yes, but output is much lower. Panels use daylight, not heat, so they generate on cloudy days, just less. In December a UK south roof produces…
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