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Number of panels
Daily consumption divided by what one panel delivers, rounded up.
The Formula
panels = ceil(daily usage / daily output per panel)
Daily consumption divided by what one panel delivers, rounded up.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| N | Panels | panels | The number of panels to install. |
| U | Daily usage | kWh | The average energy used per day. |
| E | Panel output | kWh | The daily energy from one panel. |
What Each Symbol Means
Npanels
Panels
The number of panels to install.
UkWh
Daily usage
The average energy used per day.
EkWh
Panel output
The daily energy from one panel.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate solar panels needed page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Solar Panels Needed, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.