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                        "text": "A house battery in the UK typically costs around £5,000 to £10,000 installed for many standard homes. Smaller 3 kWh to 5 kWh systems may cost about £3,500 to £6,000, while 10 kWh to 15 kWh systems often cost £8,000 to £14,000. Larger or premium systems above 15 kWh can cost £12,000 to £20,000 or more, especially if backup power, long cable runs, external installation, three-phase equipment, or consumer unit upgrades are needed."
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                        "text": "Many UK homes choose a battery between 5 kWh and 10 kWh, especially when paired with solar panels. Smaller homes or flats may only need 3 kWh to 5 kWh, while larger homes, heat pump households, or homes with higher evening electricity use may consider 10 kWh to 15 kWh or more. The best size depends on when you use electricity, not just your annual usage."
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                        "text": "No. A bigger battery can reduce the cost per usable kWh, but it is not automatically better value. A battery only saves money when it charges and discharges usefully. If it is too large for your solar generation, tariff, or evening demand, some of the extra capacity may sit unused for much of the year and may not improve payback."
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                        "text": "Yes, a house battery can be installed without solar panels and charged from the grid, usually on a time-of-use tariff. This can work if you can charge the battery at a low overnight rate and use the stored electricity during expensive peak periods. It is usually less attractive on a flat-rate tariff because the battery has efficiency losses and does not generate electricity itself."
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                        "text": "Savings vary widely and depend on your solar generation, import tariff, export tariff, electricity usage pattern, battery size, and battery settings. Batteries usually save the most when they store surplus solar or cheap-rate grid electricity and then replace expensive peak-rate imports. Savings are weaker if your usage is low, your export tariff is strong, or the battery is too large for your household demand."
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                        "text": "Most modern home batteries have warranties of around 10 years, with some offering 12 or 15 years. Expected service life is often around 10 to 15 years, depending on battery chemistry, cycling, temperature, depth of discharge, installation location, and manufacturer limits. Many warranties also specify retained capacity, commonly around 60% to 80% at the end of the warranty period."
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                        "text": "Not always. Many standard grid-tied battery systems shut down during a power cut unless they have dedicated backup equipment and the correct wiring. Backup power may be limited to selected essential circuits such as lighting, refrigeration, broadband, and some sockets. Whole-house backup is possible in some cases but usually costs more and needs careful design."
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                        "text": "Backup power can add hundreds or thousands of pounds depending on the design. Essential-load backup is usually cheaper than whole-house backup because only selected circuits are supplied. Automatic changeover, backup gateways, additional consumer unit work, and higher-power backup requirements can all increase the cost. If backup is important, it should be specified before quotation, not assumed to be included."
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                        "text": "Many qualifying domestic battery storage installations in the UK are currently eligible for zero-rated VAT under energy-saving materials rules, including many standalone battery installations since February 2024. The correct VAT treatment can depend on the property and installation type, so the installer should show VAT clearly on the quote and follow current HMRC guidance."
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                        "text": "Some battery systems only need DNO notification, while larger systems may need approval before installation. In the UK, smaller systems may fall under G98 rules, while larger or higher-output systems may require G99 approval. The 3.68 kW per phase threshold is a common point in domestic grid connection rules, especially where export capacity is involved."
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                        "text": "A house battery can technically supply power to an EV charger if the system design allows it, but most domestic batteries are much smaller than EV batteries and many cannot continuously supply a 7 kW charger. In practice, it is usually better to charge the EV directly from solar or a cheap-rate tariff, while the home battery covers household demand. EV households need careful modelling before choosing a battery size."
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                        "text": "Common locations include garages, utility rooms, plant rooms, and suitable external walls or enclosures. The location must support the battery weight, provide safe access, meet manufacturer clearances, and allow suitable cable routes. Lofts are often problematic because of heat, access, weight, ventilation, and fire safety considerations. Outdoor batteries must be correctly weather-rated and positioned away from avoidable risks such as direct sun, flooding, or poor ventilation."
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                        "text": "Check the total installed price, VAT treatment, usable capacity, continuous output, inverter type, battery chemistry, battery warranty, inverter warranty, backup capability, DNO process, expected savings, tariff assumptions, and any required electrical remedial work. It is also worth asking whether the savings estimate is based on your actual half-hourly smart meter data or on generic assumptions, because battery returns depend heavily on when you use electricity."
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