How we score panels
Each model gets an overall score out of 100, calculated as the weighted average of four independently measured axes. Full transparency: here is how they are established.
The four scoring axes
Axis 01
Performance
Efficiency (%), peak power (Wp), temperature coefficient, the ability to produce energy in real conditions and over time.
Axis 02
Durability
Build quality, mechanical resistance (snow load, wind), cell technology (monocrystalline, TOPCon...), field feedback.
Axis 03
Value for money
Price relative to power and real performance, not the headline price. We compare like for like.
Axis 04
Warranty
Product warranty length (usually 10-25 years) and minimum performance warranty, the manufacturer concrete commitment.
* The illustrative scores above reflect the typical distribution observed across our test panel.
Our 4-step process
Data collection
Manufacturer datasheets, official spec sheets, industry standards (IEC, EN), dated merchant prices. Every figure is traceable.
Score calculation
Each axis is scored out of 100 on a fixed, public grid. The overall score is the arithmetic average of the four axes, equal weight, no favouritism.
Cross-checking
Data is cross-referenced with independent sources (field feedback, third-party technical comparisons) before publication.
Regular updates
Prices move fast. We refresh our data regularly. The last update date is shown on each sheet.
Our golden rule
No manufacturer can influence a score. A model is never ranked higher for commercial reasons: only its measured results count. This is the non-negotiable condition of our credibility, and the reason you can rely on our comparisons for an investment decision.