How Many Solar Panels Does a 2,000 Sq Ft House Need?

The Quick Answer

A typical 2,000 sq ft house in the US needs a 6-8 kW solar system, which is about 15-20 panels (using 400W panels). But the real answer depends on your electricity usage, not your home size.

What Actually Determines Panel Count

Home size is a rough proxy. What really matters is:

  • Monthly electricity usage: The average US home uses about 900 kWh/month. Larger homes with AC might use 1,200-1,500 kWh.
  • Location: A home in Arizona gets 6.5 peak sun hours/day. One in Michigan gets 3.8. You need more panels in Michigan.
  • Panel efficiency: A 400W panel produces more per square foot than a 300W panel.

Calculation Example

For a 2,000 sq ft home using 1,000 kWh/month in California (5.5 sun hours):

  1. Daily usage: 1,000 ÷ 30 = 33.3 kWh/day
  2. System size: 33.3 ÷ 5.5 ÷ 0.8 = 7.6 kW (0.8 = system efficiency)
  3. Panel count: 7,600W ÷ 400W = 19 panels
  4. Roof space: 19 × 20 sq ft = 380 sq ft of roof area

Panel Count by State

Same 1,000 kWh/month usage, 400W panels:

  • Arizona: 16 panels (6.5 sun hours)
  • California: 19 panels (5.5 sun hours)
  • Texas: 20 panels (5.2 sun hours)
  • Florida: 20 panels (5.2 sun hours)
  • New York: 28 panels (3.8 sun hours)
  • Michigan: 28 panels (3.8 sun hours)

Use our panel count calculator for an exact estimate.