4kW solar system cost in the US (2026)
A smaller home or apartment with modest usage, lighting, fridge, TV, and occasional AC.
Installed cost (typical)
~$11,000
Generation
~6,480 kWh/year
Annual savings (typical)
~$1,036
Roof space needed
~260 sq ft
Typical payback
~10.6 years
Federal credit (2026)
None (25D expired)
| Size | Installed cost | Generation/yr | Annual savings | Payback | Roof space |
|---|---|---|---|---|---|
| 4kW (this page) | ~$11,000 | ~6,480 kWh | ~$1,036 | ~10.6 yrs | ~260 sq ft |
| 6kW | ~$16,500 | ~9,720 kWh | ~$1,553 | ~10.6 yrs | ~390 sq ft |
| 8kW | ~$22,000 | ~12,960 kWh | ~$2,071 | ~10.6 yrs | ~520 sq ft |
| 10kW | ~$27,500 | ~16,200 kWh | ~$2,589 | ~10.6 yrs | ~650 sq ft |
| 12kW | ~$33,000 | ~19,440 kWh | ~$3,107 | ~10.6 yrs | ~780 sq ft |
Savings assume typical electricity rates and net-metering. Your numbers depend on your state and utility,run your own figures here.
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