A 5 kW solar system can produce very different amounts of electricity depending on location, sunlight, roof orientation, shading, equipment, weather, and system losses. That is why a single national production number can be misleading.
How much electricity does a 5 kW solar system produce?
A useful starting point is the system’s expected production ratio. For a simple planning estimate, a 5 kW system might produce roughly 7,000 kWh of electricity per year in a location with a production ratio around 1.4. That works out to about 19 kWh per day on an annual average. Actual production can be substantially higher or lower.
For a more accurate estimate, use NREL’s PVWatts calculator. PVWatts models grid-connected photovoltaic production using inputs such as system size, module and array configuration, losses, tilt, and azimuth.
What changes solar production?
Peak sun hours
More usable sunlight generally means more annual production. A 5 kW system in Arizona will not have the same output as a 5 kW system in a less sunny location.
System losses
Solar production is reduced by factors such as temperature, wiring, inverter losses, mismatch, shading, and soiling. NREL’s PVWatts documentation includes these losses in its production modeling.
Roof direction and shading
Roof orientation, tilt, nearby trees, buildings, and other obstructions can materially change production. Two homes with identical 5 kW systems can therefore have different annual output.
5 kW solar production example
| Assumption | Example |
|---|---|
| System size | 5 kW |
| Production ratio | 1.4 |
| Estimated annual production | 7,000 kWh |
| Average daily production | 19.2 kWh |
This is an illustrative estimate, not a promise of production. Your utility bills and a location-specific production model are better inputs for an investment decision.
How many panels make a 5 kW system?
With 400-watt panels, a 5 kW nameplate system would require about 13 panels because 12 panels equal 4.8 kW and 13 equal 5.2 kW. The final design depends on available roof space, equipment, electrical design, and the installer’s system configuration.
How to estimate your own production
- Find your annual electricity use in kWh.
- Check a location-specific solar production estimate.
- Account for roof orientation, shading, and system losses.
- Compare expected production with your household’s annual consumption.
For a quick planning estimate, try our Solar Panel Sizing Calculator.