What Affects Solar Installation Prices?
Solar installation costs vary based on several factors: your location, roof type and complexity, the brand and efficiency of panels chosen, inverter type (string vs micro), whether battery storage is included, and local labour costs. Quotes from different installers for the same system size can vary by 20–40%.
The most important comparison is cost per kilowatt installed — this normalises the price across different system sizes and makes it easy to compare quotes. A typical residential system in the UK costs £1,500–£2,200 per kW, while in Australia it's A$1,000–$1,600 per kW, and in the US $2,400–$3,200 per kW.
How to Compare Solar Quotes Properly
When comparing quotes, make sure you're comparing like-for-like. Key things to check:
- System size: Ensure quotes are for the same kW capacity
- Panel brand and model: Premium panels (e.g. SunPower, REC Alpha) cost more but may generate more
- Inverter type: Microinverters cost more than string inverters but offer panel-level optimisation
- Battery: If included, compare the same capacity and brand
- Inclusions: Scaffolding, grid application, monitoring, and labour should all be in the price
- Warranties: Longer workmanship warranties indicate installer confidence
Average Solar Installation Costs by Country
| Country | Cost per kW | 4 kW System | Battery (per kWh) |
|---|---|---|---|
| United States | $2,400–$3,200 | $9,600–$12,800 | $800 |
| United Kingdom | £1,500–£2,200 | £6,000–£8,800 | £600 |
| Canada | C$2,600–$3,400 | C$10,400–$13,600 | C$900 |
| Australia | A$1,000–$1,600 | A$4,000–$6,400 | A$700 |
| Ireland | €1,600–€2,400 | €6,400–€9,600 | €650 |
| Spain | €1,100–€1,600 | €4,400–€6,400 | €550 |
Prices are averages and may vary by region, installer, and equipment quality.