What kilowatt-hour means
A kilowatt-hour is the unit of energy on an electric bill: a kilowatt of power used for an hour. A kilowatt is the rate; a kilowatt-hour is the amount.
Also called kWh.
Where it matters on a solar job
Solar sizing, battery sizing and savings estimates all run in kilowatt-hours. Ask for a year of the customer's usage before quoting, since a single month's bill misleads.
The numbers, with sources
- One kilowatt-hour equals 3,412 Btu. (US Energy Information Administration)
What it costs
For kilowatt-hour, the closest koira.ai price is the solar panel installation cost guide, near $21,000 for a typical job and $16,500 to $24,000 for most. The guide shows its sources and what moves the price.
Work it out
- Cost guide: Solar panel installation cost
- Tools, templates and guides: Free solar resources
Sources: US Energy Information Administration, British thermal units (Btu). Checked October 9, 2026.