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Batteries · 14 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.
The archive
Long-form pieces that explore questions our reference guides cannot. We show our working and update the conclusions when the evidence moves.
Batteries · 14 minute read
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.
Solar · 9 minute read
A 2.8 kWp system was the sensible number in 2019. It is not now, and the reasons are not just about price.
EV charging · 11 minute read
There are three differences that matter and seven that the marketing pages want you to weight. We separated them.
Heat pumps · 17 minute read
A semi in West Yorkshire. The 14 kW survey was wrong. Here is how to tell when yours is.
Tariffs · 8 minute read
The cheapest unit rate is not the cheapest tariff. We pulled twelve months of data to show why.