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The Solar Panel
The module itself — glass, cells and an aluminium frame. The part everybody pictures when they think “solar,” and the part that fails least often.
Specs & why they matter
- Typically 400–500 W per module on a residential roof today
- Tempered glass over crystalline-silicon cells in an anodised aluminium frame
- Power output is normally warranted for 25 years — the longest-lived part of the system
- Degrades slowly and predictably, so a sudden drop in production almost never starts here
