Solar Panels: Types, Technology and What to Compare
Solar panels turn sunlight into direct current electricity. Choosing between panel technologies is easier when you know what each is good at and what to ask a supplier.
Panel technologies
- Monocrystalline: the common choice for rooftops, efficient per square metre.
- TOPCon: a newer n-type cell design with better high-temperature and low-light behaviour.
- Bifacial: collects light on both sides; gains depend on how much light reflects from the surface below.
- Polycrystalline: older technology, now less common in new installations.
What to compare
- Rated power (watts) and efficiency
- Performance and product warranty terms
- Temperature coefficient, relevant for hot summers
- Certifications and test reports from the manufacturer
- Physical size and weight for your roof
Mounting structures and accessories
The structure holds panels at the right angle and must resist wind and corrosion; in hilly or high-rainfall areas this matters. Accessories include cables, connectors, protection devices, earthing and monitoring.
Maintenance
Panels have no moving parts. Periodic cleaning and visual checks keep output steady, as covered in our maintenance guide.
Frequently asked questions
Which panel type is best?
It depends on roof space, budget and conditions. For most homes, monocrystalline or TOPCon panels are the practical shortlist.
Do bifacial panels always generate more?
No. The extra gain depends on the reflectivity and height of the surface behind the panel.