Guides
Choose, use, understand.
How storage works, which one to choose, and what the rules say about where it may be connected.
Buying guide / pick
Choosing
Power station as a backup supply: what to check
To keep a router, PC and fridge running through a blackout, only a few fields on the product page matter. Here is which…
Buying guide / pick
Choosing
Expansion battery: when it makes sense to add one
An expansion battery adds energy, not power, and only works with the machine it was made for. Here is how to tell wheth…
Deep dive
Using
How many hours will the fridge last, and the other sums you do by hand
A fridge doesn't draw the watts on its nameplate, and multiplying watts by hours is the mistake that's out by a factor …
Deep dive
Understanding
How much does every kWh passing through the battery cost
Price divided by capacity tells you what it costs to buy, not what it costs to use. The sum that brings together price,…
Deep dive
Understanding
How long does a battery storage system really last, and what runs out first
Six thousand cycles on the box and two years on the warranty certificate are two promises that never meet. Which number…