How many solar panels for 1,000 kWh per month?
About 24 panels at 400 watts each, a 9.6 kW system, under the national-average 4.5 peak sun hours. This page is sized from a 1,000 kWh monthly bill, not from house square footage. Sun moves the count from 17 panels in the desert Southwest to 27 in the cloudiest states, and panel wattage trades count against roof area. Both tables below; your state in the picker.
Panel count by sun and wattage
Counts cover 1,000 kWh fully, rounded up to whole panels, with the 0.77 derate from rated watts to real output (methodology). Bold is the US-average column.
| Peak sun hours | 350W panels | 400W panels | 450W panels |
|---|---|---|---|
| 4.0 h | 31 | 27 | 24 |
| 4.5 h (US avg) | 28 | 24 | 22 |
| 5.0 h | 25 | 22 | 19 |
| 5.5 h | 23 | 20 | 18 |
| 6.0 h | 21 | 18 | 16 |
| 6.5 h | 19 | 17 | 15 |
Same bill, six real states
| State | Sun | Panels (400W) | System |
|---|---|---|---|
| Arizona | 6.5 h | 17 panels | 6.8 kW |
| Texas | 5.3 h | 21 panels | 8.4 kW |
| Florida | 5.2 h | 21 panels | 8.4 kW |
| Missouri | 4.6 h | 24 panels | 9.6 kW |
| New York | 3.9 h | 28 panels | 11.2 kW |
| Washington | 3.8 h | 29 panels | 11.6 kW |
What a 1,000 kWh household looks like
A thousand kWh a month is a bit above the US average of about 900: a family home with central AC, or average usage plus an EV that charges a few nights a week. Nothing about this tier is exotic; it is the bread-and-butter residential system, which also means it is the tier with the most quotes to compare against. Use the table to sanity-check the panel count on any bid that lands in your inbox.
This is also the tier where an EV starts showing up in the data. A 40-mile daily commute at roughly 3.5 miles per kWh is about 350 kWh a month, so one car can be a third of a 1,000 kWh bill by itself. Worth knowing whether it is, because charging is the only load on the list you can freely move. Putting the car on the charger at midday runs it off the array directly instead of off the grid at 2am. It changes nothing about the panel count on this page and quite a lot about when the array is doing useful work.
Questions people ask
How many solar panels do I need for 1,000 kWh per month?
About 24 400-watt panels (a 9.6 kW system) at the national-average 4.5 peak sun hours, after the 0.77 real-world output derate. Strong desert sun brings it down to 17; cloudy-state sun pushes it to 27. The tables on this page break it out by sun figure and panel wattage.
What system size covers 1,000 kWh a month?
Roughly 9.5 kW of DC capacity at average US sun; we round panels up, so the quoted 9.6 kW covers it with a little margin. In sunnier states the same bill takes proportionally less capacity, which is the whole reason the per-state figures matter.
Do I have to cover 100% of the bill?
No, and often you shouldn’t. Utilities with poor net-metering rates make the last 20% of offset the worst-value panels on the roof, and some cap system size at your historical usage anyway. Sizing to 70-90% of the bill is a normal, defensible design choice; covering every kWh is only automatic where net metering pays retail.
Does EV charging change the panel count at 1,000 kWh a month?
Not the count, which follows the monthly total no matter what produced it. It changes when the output gets used. A 40-mile daily commute is roughly 350 kWh a month, and moving that charge to the middle of the day runs the car off the array directly instead of pulling from the grid at 2am. Same panels, different hours, and it is the one load on the list you can reschedule freely.