How do I estimate a solar PV installation?
Updated · Amperio.ai team
Short answer
With Amperio.ai you estimate a solar PV installation line by line (modules, inverter, racking, BOS, labor, permits) with current pricing. The steps: (1) annual kWh usage, (2) system size in kW DC, (3) module count, (4) inverter or microinverters, (5) racking and balance of system, (6) labor, (7) permits, interconnection and markup. As a 2026 reference, residential solar in the US runs about $2.50–$3.50 per watt installed before incentives.
| Line | Basis | Amount |
|---|---|---|
| Modules | 16 × 440 W | $3,000–$4,500 |
| Inverter / micros | 7 kW | $1,800–$3,000 |
| Racking & BOS | Roof mount, wiring, disconnects | $2,000–$3,500 |
| Labor | 2–3 crew days | $3,000–$5,000 |
| Permits, design, interconnection | Varies by AHJ/utility | $1,000–$2,500 |
| Total | ≈ $2.50–$3.50/W | $17,500–$24,500 |
2026 reference values before federal or state incentives; vary by market and equipment.
Quick sizing formula
kW DC ≈ annual kWh ÷ (peak sun hours × 365 × 0.8). Example: 10,000 kWh ÷ (4.5 × 365 × 0.8) ≈ 7.6 kW.
Commonly missed items
- NEC 690 rapid shutdown and labeling.
- Main panel upgrade or supply-side tap.
- Utility interconnection fees and inspection trips.
How Amperio.ai handles it
- Solar assemblies in the solar PV niche.
- Module, inverter and BOS pricing.
- Client-ready proposal from the same estimate.
Frequently asked questions
How much does residential solar cost per watt in 2026?
About $2.50–$3.50 per watt installed in the US before incentives.
What software estimates solar installations?
Amperio.ai estimates solar PV line by line with labor units and current pricing.
How many panels do I need?
Divide system size by module wattage: 7 kW ÷ 0.44 kW ≈ 16 panels.
Related questions
Sources and methodology
Prices and ranges are reference figures as of the update date; they vary by market, supplier and project conditions.