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Solar panels in Indianapolis, Indiana
Indianapolis receives 4.15 peak sun hours a day and 1,515 kWh/m² of solar energy a year. That is measured satellite data for Indianapolis's coordinates, not a national average — and it changes the panel count.
Indianapolis solar data
4.15peak sun hours/day
1,515annual irradiance (kWh/m²)
1.37kWh/day from one 400 W panel
500kWh/year from one 400 W panel
Monthly solar irradiance in Indianapolis
| Month | Peak sun hours/day | Share of year |
|---|---|---|
| January | 1.49 | 0.1 |
| February | 3.21 | 0.3 |
| March | 3.97 | 0.3 |
| April | 4.84 | 0.4 |
| May | 5.80 | 0.5 |
| June | 6.34 | 0.5 |
| July | 6.03 | 0.5 |
| August | 5.80 | 0.5 |
| September | 4.53 | 0.4 |
| October | 4.00 | 0.3 |
| November | 2.00 | 0.2 |
| December | 1.64 | 0.1 |
Source: NASA POWER daily point API, parameter ALLSKY_SFC_SW_DWN (global horizontal irradiance), year 2024. Coordinates 39.7684, -86.1581.
How many solar panels does Indianapolis need?
For a typical US household using 900 kWh a month, Indianapolis needs about 22 panels of 400 W (8.76 kWp), with a south-facing roof. That is more panels than the same household would need in a city with 4.5 peak sun hours.