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                    "name": "What does EPVS mean in UK solar?",
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                        "text": "EPVS stands for Energy Performance Validation Scheme. In UK solar, it is a consumer-protection scheme that checks whether quoted performance, savings, export income and payback claims have been calculated and presented in a fair, consistent and transparent way. It helps customers understand the assumptions behind a solar quote, but it does not guarantee the exact results the system will deliver."
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                        "text": "No. EPVS does not guarantee exact annual savings, future electricity prices, export rates or a fixed payback period. Solar output and financial returns can change because of weather, shading, household usage, tariff changes, export rates, equipment performance, downtime and gradual panel degradation. EPVS is about checking that the estimate is reasonable and transparent, not promising a future financial result."
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                    "name": "Why does EPVS matter when comparing solar quotes?",
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                        "text": "EPVS matters because two quotes for similar solar equipment can show very different savings or payback periods. These differences may come from assumptions about generation, shading, self-consumption, battery use, import electricity prices, export tariffs, degradation or calculation length. EPVS helps make those assumptions visible so you can compare quotes more fairly instead of relying only on the headline saving or shortest payback."
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                        "text": "A good EPVS-style quote should show the system size in kWp, panel and inverter specification, roof orientation, roof pitch, shading allowance, estimated annual generation in kWh, import electricity price, export tariff, self-consumption assumption, degradation assumption, total installed cost and calculation period. If a battery is included, it should also show usable capacity, expected battery behaviour and how the battery changes the savings calculation."
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                        "text": "No. EPVS does not prove that a quote is the cheapest or best overall. It helps validate the way savings and performance claims are presented. You should still compare the equipment, installation scope, warranties, scaffolding, DNO work, electrical upgrades, VAT treatment, monitoring, aftercare, installer competence and contract terms."
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                    "name": "What is self-consumption in a solar quote?",
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                        "text": "Self-consumption is the share of solar electricity you use in your home instead of exporting to the grid. It has a major impact on savings because electricity used at home usually offsets a higher import rate, while exported electricity is paid at a separate export tariff. A quote that assumes very high self-consumption should explain why that is realistic for your household, for example because you work from home, use appliances during the day, charge an EV in daylight hours or have a suitable battery."
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                    "name": "Why do solar payback periods vary so much between quotes?",
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                        "text": "Payback periods vary because installers may use different assumptions for annual generation, roof orientation, shading, electricity prices, export tariffs, self-consumption, battery savings, future price changes, degradation and maintenance. A shorter payback is not automatically better unless the assumptions behind it are realistic, clearly shown and matched to your property and usage."
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                    "name": "What red flags should I look for in solar savings claims?",
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                        "text": "Be cautious if a quote promises guaranteed savings, claims solar will remove your whole electricity bill, includes standing charges as a saving, uses pressure-selling tactics, gives a payback period without showing the assumptions, ignores visible shading, uses an export tariff you may not be eligible for, or includes battery savings without explaining how the battery will charge and discharge. Verbal claims should also match the written quote."
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                        "text": "Yes. EPVS is especially useful for solar and battery quotes because battery savings depend on usable capacity, household demand, solar generation, tariff structure, charge and discharge efficiency, degradation and cycling. A quote should not simply assume that adding a battery turns all unused solar electricity into a saving. The calculation should explain how much solar is expected to be stored, how much will still be exported and whether time-of-use tariffs are being included."
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                    "@type": "Question",
                    "name": "Can EPVS replace a roof survey or installation assessment?",
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                        "text": "No. EPVS can help check the financial and performance claims, but it does not replace a proper survey, roof condition assessment, structural considerations, electrical checks, planning advice, DNO requirements or building regulations compliance. A quote still needs to be based on a suitable technical design for the property."
                    }
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                    "@type": "Question",
                    "name": "Should EPVS validation be updated after a survey?",
                    "acceptedAnswer": {
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                        "text": "Yes, if the final design changes materially. An EPVS validation is most useful when it matches the actual system being installed. If the panel layout, roof planes, inverter, battery size, export limit, shading assessment or total installed cost changes after survey, the savings estimate should be reviewed and, where needed, updated so the payback claim still reflects the final proposal."
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                    "name": "How do import and export tariffs affect EPVS savings calculations?",
                    "acceptedAnswer": {
                        "@type": "Answer",
                        "text": "Import and export tariffs can make a major difference to quoted savings. Electricity used directly from your solar panels reduces the amount you buy from the grid at your import rate, while exported electricity is paid at a separate export tariff. If a quote assumes a high export rate, check whether you are eligible for that tariff, whether you need to switch supplier and whether any conditions apply. Future electricity price assumptions should be treated as forecasts, not guarantees."
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                        "text": "EPVS-style calculations should take account of the roof and generation assumptions used in the quote, including orientation, pitch and shading. Shading from chimneys, dormers, trees and nearby buildings can materially reduce output, so a quote that assumes little or no shading should be able to explain how that conclusion was reached. Optimisers or microinverters may help some shaded or complex roofs, but they do not remove the physical loss caused by shade."
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                        "text": "EPVS does not replace DNO approval or grid connection checks. Small domestic systems may fall under G98 notification rules if they meet the relevant limits, while larger systems or higher export capacity may require G99 approval before installation. If export is limited, the savings calculation should reflect that where it affects the design, export income or battery assumptions."
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                        "text": "Ask whether the installer is EPVS-certified or using EPVS-validated calculations, whether you can see the calculation details, what generation estimate was used, what import and export tariffs were assumed, what self-consumption percentage was used, how shading was treated, whether degradation is included, whether all installation costs are included in the payback calculation and whether the EPVS validation matches the final surveyed design."
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