The UK home energy stack reference. Solar, batteries, EV charging and heat pumps.
Reference guides on the kit and the install process. Calculators with the assumptions exposed. Decision-led articles for comparing quotes, tariffs and system designs.
Calculators
Numbers worth running before signing
Built for the kinds of questions that crop up while you are reading a quote. Each one prints the working it does to reach the number.
Solar payback
Years to break even on the panels, given your roof and tariff.
Uses roof orientation, shading, tariff, behaviour
Battery sizing
Smallest battery that catches most of your spare solar.
Uses evening load shape, solar export, round-trip losses
EV running cost
Smart-tariff overnight charging vs standard rate.
Uses annual mileage, vehicle efficiency, tariff windows
Heat loss check
Sanity-check the survey figure your installer has quoted.
Uses floor area, insulation level, target room temperature
Topics
The four pillars of home energy
Independent UK guides on the four bits of kit that make up a modern home energy setup. Each topic page pulls together the basics, the deeper guides and the calculators that go with it.
Solar
Panels, inverters, mounting and what the install day actually looks like.
Battery storage
Sizing, chemistry, hybrid systems, payback and virtual power plants.
EV charging
Home chargers, smart tariffs, load balancing and public network reliability.
Heat pumps
Air source, ground source, the survey, the radiator question and the BUS grant.
Knowledge base
Deeper reference pages on the kit, the install process and the regulations.
Articles
Recent articles
In-depth pieces on the bigger decisions, with the working underneath the conclusions.
Are home batteries worth it on a small solar array?
When the payback maths works for storage on a sub-5 kWp solar setup, and when it doesn't.
String vs microinverters for a split roof
How roof orientation, shading patterns and future plans drive the inverter choice.
Why heat pump surveys disagree, and how to spot a bad one
What a good heat-loss survey looks like, and the red flags in a thin one.