How many solar panels for a 1,075 sq ft (100 m²) home?

A 1,075 sq ft (100 m²) home is the typical European or Latin American 3-bedroom house. Average electrical consumption: 7-10 kWh/day (2,500-3,500 kWh/year). Here's exactly how many panels you need.

Typical consumption

• LED lighting: 0.5-0.8 kWh/day
• Fridge + freezer: 1-1.5 kWh/day
• Washer, dishwasher, microwave: 1-1.5 kWh/day
• TV, computers, router: 0.8-1.2 kWh/day
• Standby + small loads: 1-2 kWh/day
• AC or heat: 2-4 kWh/day (seasonal)

Sizing: the recommended kit

Assuming 8 kWh/day annual average in a 4.5 PSH location: 8,000 ÷ 4.5 × 1.3 = 2,310 W of panels. That's 5-6 × 410-450 W panels (≈ 2,500 W installed). With net metering you skip the battery and break even in 6-7 years.

If you want battery autonomy

Add a 10 kWh LiFePO4 battery (covers night + one cloudy day) and a 3-5 kW hybrid inverter. Bump panels to 7-8 to ensure recharge even in winter. Turnkey cost: $9,000-14,000.

What changes the math

If you have a pool, EV, electric heat or central AC, consumption easily doubles. In that case jump to the 200 m² (≈2,150 sq ft) sizing or run your exact numbers.

If your home is larger, see panels for a 2,150 sq ft home. To decide about storage, see when a solar battery is worth it.