Solar sized by real weather
Tell us where you are and what you want to power. We replay years of real sunshine and temperature at your location and size three systems for you, with a full parts list.
We suggest your country. You confirm it or change it.
How it works
Confirm where you are
We suggest your country, you confirm or change it. Then add your ZIP code or postcode, what you want to power, and how it is used: a cabin, shed, RV, campervan, boat, backup power or a plug-in balcony kit.
We replay real weather
We simulate years of historical sunshine and temperature for your location, day by day, instead of using one average number.
Get three options and a parts list
Minimum, medium or with margin, each with panels, battery, controller, inverter and the small parts people forget.
Our principles
Many brands, chosen by specifications
We compare products from many manufacturers and pick parts by their technical specifications for your needs.
A published method
See where our numbers come from and where they can be wrong.
Based on sources
Datasheets, standards and studies, listed on every article.
Guides by country
Rules, prices and shops differ by country, so our guides are written for one country at a time.