Path-Q Solar
Should I compare solar quotes by total price or by cost per unit of system capacity?
Answer
Use total price as the primary budget measure, but do not rely on either total price or cost per unit of capacity alone. Cost per capacity is useful only after confirming that quotes have comparable equipment, design, production, roof work, electrical scope, warranties, and financing assumptions.
Key points
- Total price shows the actual project commitment but can hide differences in system size and scope.
- Capacity-based price helps compare equipment scale but does not measure energy yield or value.
- Also compare estimated annual production, usable capacity, self-consumption, lifecycle cost, and included work.
- Separate cash price, financed price, fees, maintenance, and optional work.
What it depends on
- System capacity and expected production
- Equipment, installation, roof, electrical, and permitting scope
- Financing terms and fees
- Warranty, monitoring, service, and exclusions
Risks and trade-offs
- A low capacity-based price may reflect lower-quality equipment or omitted scope.
- A larger system can have a higher total price but lower unit cost and poor marginal value.
- Financing can make quoted totals difficult to compare unless cash price and terms are separated.
Information you may need
- Comparable itemized cash prices
- System capacity and annual production estimates
- Equipment, warranty, financing, and exclusion details
Your next step
What to do next
Normalize each quote to the same scope, then compare total price, cost per capacity, cost per expected annual energy, and lifetime economics.
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