Solar Energy Concepts

in depth posts

Illustration 16:9: A stylish living room setting with a prominent home energy battery subtly integrated into the design. The background transitions from a deep hue to a lighter shade. Abstract art motifs symbolizing energy and efficiency are present, along with subtle icons representing cost savings.
Fundamentals

Home Battery Storage Without Solar UK: Is It Worth It? (2026)

  • Use the calculator to estimate how much you can save with a battery.
  • Yes, it’s worth it. A 16.1kWh battery on Octopus Go pays for itself in 3.2 years — no solar panels needed.
  • Save £5,200–£7,700+ over 16 years using cheap overnight electricity and discharging during peak hours.
  • System cost ~£3,300 (battery + inverter + electrician). 0% VAT until March 2027.
  • From 15 April 2026: BS 7671 Amendment 4 is published and in force, and Chapter 702 is the first UK wiring standard for home batteries.
  • Best tariff: Octopus Go (7.5p overnight → ~28.5p peak = 21p spread). Start with battery, add solar later.
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Eco-Friendly Redbrick House with Solar Panels in Simplistic Design
Fundamentals

Guide to Optimal Solar Panels Wiring for Expanding Strings

  • Use the calculator to estimate your numbers based on your setup.
  • Series wiring adds voltage — use when panels face the same direction and have similar specs.
  • Parallel wiring adds current — use when panels face different directions or have mismatched specs.
  • Check your inverter limits: Voc per string must stay below max input voltage, Isc must stay below max input current.
  • Mixed panels? Match Imp (current at max power) for series, match Vmp (voltage at max power) for parallel.
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