5kW Solar System: Output, Cost and When It Fits

A 5kW system is a good fit for smaller homes, low-to-moderate users, or apartments-with-a-roof where 6kW+ won’t fit. It covers a lot of typical daytime use while staying affordable.

Generation and sun hours

At 3.5–5.5 peak sun hours, a 5kW array generates roughly 17–27 kWh/day, or about 6,400–10,000 kWh/year, before degradation. For a home using ~18–22 kWh/day, a 5kW system typically covers most daytime use.

Cost and panel count

• ~11–15 panels at 370–440W
• Approx 22–30 m² of roof
• Installed cost commonly USD $11k–$16k / A$5k–$8k / £5k–£8k