How many solar panels for 2,000 kWh per month?
About 48 panels at 400 watts each, a 19.2 kW system, under the national-average 4.5 peak sun hours. This page is sized from a 2,000 kWh monthly bill, not from house square footage. Sun moves the count from 33 panels in the desert Southwest to 54 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 2,000 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 | 62 | 54 | 48 |
| 4.5 h (US avg) | 55 | 48 | 43 |
| 5.0 h | 49 | 43 | 38 |
| 5.5 h | 45 | 39 | 35 |
| 6.0 h | 41 | 36 | 32 |
| 6.5 h | 38 | 33 | 30 |
Same bill, six real states
| State | Sun | Panels (400W) | System |
|---|---|---|---|
| Arizona | 6.5 h | 33 panels | 13.2 kW |
| Texas | 5.3 h | 41 panels | 16.4 kW |
| Florida | 5.2 h | 42 panels | 16.8 kW |
| Missouri | 4.6 h | 47 panels | 18.8 kW |
| New York | 3.9 h | 55 panels | 22 kW |
| Washington | 3.8 h | 57 panels | 22.8 kW |
What a 2,000 kWh household looks like
Two thousand kWh a month is heavy usage: large all-electric homes, pool plus EV, or a home office that runs real equipment. At average sun this is a 19.2 kW array, which is past what many roofs hold and past the size where some utilities change the interconnection rules.
At roughly 19 kW the interconnection paperwork stops being a formality. Residential tariffs commonly step at 10 kW and again at 20 kW of AC output, and a system this size lands on that second step, which usually means a supplemental review with a study window measured in weeks instead of a same-week fast-track approval. Open that conversation with the utility before the equipment order goes in. The number they care about is inverter AC output, not the DC panel total this page counts, and the two are never the same figure.
Questions people ask
How many solar panels do I need for 2,000 kWh per month?
About 48 400-watt panels (a 19.2 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 33; cloudy-state sun pushes it to 54. The tables on this page break it out by sun figure and panel wattage.
What system size covers 2,000 kWh a month?
Roughly 19 kW of DC capacity at average US sun; we round panels up, so the quoted 19.2 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 a system this size need special utility approval?
Very likely. Residential interconnection tariffs commonly step at 10 kW and again at 20 kW of inverter AC output, and an array covering 2,000 kWh a month sits on that second step, which usually means a supplemental review instead of the fast-track path. Ask the utility for the study timeline before the equipment order goes in, and quote them the AC figure, because the DC panel total on this page is not the number their tariff reads.