Guides for the United States

Guides written for the United States: local rules, prices and shops.

Looking for general articles? See the blog

• How much solar power you get in each region of the United States

  Published October 20, 2026Topic: Basics

  What a 100 W solar panel gives per day, month by month, in 7 US regions, from many years of real weather records.

• Is plug-in solar legal in my state? US rules, limits and certification

  Published October 20, 2026Topic: Regulations

  Which US states allow plug-in (balcony) solar, the power limits, UL 3700 certification, utility notice, renters and HOAs. Checked October 20, 2026.

• How to size off-grid solar for a cabin

  Published October 20, 2026Topic: Installation

  Step-by-step off-grid solar sizing for a US cabin: your loads, your season, panels, battery, cold and snow, NEC and permits, with a worked example.

• How big a battery backup do you need for a power outage?

  Published October 20, 2026Topic: Basics

  Size backup power for US outages in plain steps - what must keep running, motor surge, outage length, battery, solar or generator, and electrician rules.