Reference / Articles
Articles
Long-form essays on solar, batteries, EV charging and heat pumps. We show our working and update conclusions when the evidence moves.
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Battery14 minute read
Should you add a home battery to a small solar array?
A 4 kWp roof in Surrey, a 5 kWh battery and a year of half-hourly meter data. We ran the numbers four different ways and changed our mind twice.
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Solar9 minute read
Why our first system was the wrong shape, and what we would do now
A 2.8 kWp system was the sensible number in 2019. It is not now, and the reasons are not just about price.
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EV charging11 minute read
Smart chargers are mostly all the same. Here is what actually differs.
Three differences that matter, seven that the marketing pages want you to weight.
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Heat pumps17 minute read
Two installers, two surveys, two different answers
A semi in West Yorkshire. The 14 kW survey was wrong. Here is how to tell when yours is.
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Tariffs8 minute read
The smart-tariff trap nobody talks about
The cheapest unit rate is not the cheapest tariff. Twelve months of data to show why.
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Battery6 minute read
V2H is nearly here. Mostly.
The vehicle-to-home story keeps getting closer. We tally what is shipping, what is promised and what is still a slide.