kW: system power
Kilowatts describe a power rating. A 10 kW DC array is rated under test conditions; it will not produce 10 kW continuously.
Solar 101 · Power Production
Power is a moment.
Energy adds up.
Learn what the numbers on a solar proposal mean—and what can change them.
kWh: energy produced
Kilowatt-hours measure energy over time. An average output of 5 kW sustained for 4 hours produces 20 kWh.
Generation is not export
Some solar energy is used directly by your property. Only the surplus sent through the meter becomes an export.
Learn more →Why output changes.
The property
Roof direction, tilt, obstructions and shade influence the sunlight reaching the modules. Ground mounts offer different layout choices when land and approvals permit.
The season & equipment
Daylight, clouds, temperature and snow affect generation. Equipment conversion, wiring and other system losses also belong in an annual production estimate.
Compare annual production with annual consumption, and review the assumptions behind the estimate. A battery shifts when available energy is used; it does not create additional solar generation.
See how solar, inverters and storage connect →