Grants & Policy 10 min read
The 20% Tax Trap Hiding in Your Solar Array
Discover why the 0% battery storage vat exemption 2027 deadline means waiting to retrofit a solar battery could cost you an extra 20% in taxes. Get the facts.
The homeowner research library
Insights for better energy decisions.
Clear-eyed guides to solar panels, heat pumps and home energy. Real numbers, policy explained, and the detail that matters before you commit.
61 researched guides 05 topics to explore Written for UK homes
Search all 61 guides, or browse topics and pages below.
The archive
Latest stories · Page 3
Showing 25–36 of 61
Battery Storage 11 min read
The 75 kWh Elephant: Why Your Home Battery Can't Charge Your EV
Can you charge ev from home battery storage? Discover the 15x scale mismatch, DC-AC-DC conversion losses, and why a smart 7p/kWh tariff is the smarter fix.
Battery Storage 10 min read
The 4 PM Paradox: Why Emptying Your Battery Pays More Than Hoarding It
Discover why hoarding solar is a myth. Uncover the Octopus Flux export rates 2026 and learn how battery storage arbitrage can earn you hundreds a year.
Market Updates 12 min read
What's Changing for UK Solar Panels and Heat Pumps in August 2026?
August 2026: Gas bills up 27.7% as Q3 cap bites at 7.33p/kWh. BUS hits £9,000 for oil homes from 21 July. UK solar passes 2 million installs. Heat pumps now cheaper to run than gas at the 3.56 spark gap. Warm Homes Loan Scheme launches September.
Battery Storage 9 min read
The Retrofit Paradox: Why a Less Efficient Battery Saves You Thousands
Looking to add battery to existing solar system hardware? Discover why keeping your current inverter with AC-coupling saves thousands over a costly DC hybrid upgrade.
Battery Storage 9 min read
The Anti-Islanding Trap: Why a £6,000 Battery Goes Dark in a Power Cut
Discover why your solar battery power cut uk expectations are wrong. Learn how anti-islanding laws force a 200ms shutdown, and why EPS backup hardware is vital.
Solar Panels 9 min read
The 26p Breakthrough: Why the Solar Panel Payback Period Collapsed to Under a Decade
Think the solar panel payback period uk 2026 delivers is still 20 years? Discover how the 26p Ofgem cap and 0% VAT collapsed UK solar ROI to 6-9 years.
Solar Panels 8 min read
The 24% Efficiency Trap: Why the World's Best Solar Panel Loses You Money
Discover why buying the most efficient solar panels in the UK could cost you thousands extra. Compare 2026 TOPCon vs Maxeon payback periods before you buy.
Battery Storage 8 min read
The £400 Battery Alternative Hiding in Your Airing Cupboard
Compare solar diverters vs batteries for UK homes. Learn how a £400 immersion controller turns your hot water tank into an 11 kWh thermal store with a 2-year ROI.
Solar Panels 9 min read
The Chimney Fallacy: How One Shadow Exposed Solar's Most Costly Myth
Worried about a chimney or tree? Discover how modern microinverters make solar panels on a shaded roof efficient and profitable. Get your yield quote.
Solar Panels 11 min read
The South-Facing Fallacy: Why East/West Roofs Win the Modern Grid
Think your roof faces the wrong way? Discover why east west solar panels UK installations outperform south-facing roofs on modern time-of-use tariffs.
Heat Pumps 10 min read
The Combi-Boiler Illusion: Where to Hide a Heat Pump Cylinder in a Terraced House
Want a heat pump without hot water cylinder space? Discover how phase-change heat batteries replace combi boilers, fitting under a kitchen counter.
Independent-minded guidance
Research you can actually use.
Written by Mark Anthony Haines, with over a decade in UK renewable energy. We work from published policy, industry data and real-world performance, and explain the assumptions behind the numbers.
Ready for advice specific to your home?
Compare quotes from local MCS-certified installers, free and without obligation.
Get free local quotes →