Bifacial vs Monofacial Solar Panels – What’s the Difference? (Wellington & Kāpiti Guide) 

If you’re looking at installing solar power in Wellington or the Kāpiti Coast, you’ll quickly come across two main types of solar panels: monofacial and bifacial. They might look similar, but the way they work — and the results they deliver — can be quite different. At Cableworks Electrical, we want our clients to feel confident and informed when choosing the right system for their home or business, so here’s a simple guide to help you understand the difference. 

What Are Monofacial Solar Panels? 

Monofacial panels are the traditional solar panels most people recognise. These panels generate electricity from one side only, using the sunlight that hits the front of the panel. They typically feature a glass front with a solid backsheet, which protects the rear of the panel. 

Monofacial panels remain the most popular option for Wellington homes and Kāpiti Coast properties, and for good reason: 

• Consistent performance in Wellington’s mix of sun, wind and cooler temperatures Cost-effective compared to premium panel types
• Excellent for standard pitched roofs, which are common throughout Kāpiti, Porirua and Upper Hutt 
• Available in a wide range of sizes and efficiencies 
• For most residential installations, a high-quality monofacial panel offers exceptional reliability and long-term performance. 

What Are Bifacial Solar Panels? 

Bifacial panels are a more advanced form of solar technology. Instead of producing power from just the front side, they can generate electricity from both the front and the back. 

How? The underside of a bifacial panel is designed to capture reflected light — sunlight bouncing off your roof, decking, driveway, concrete or even surrounding buildings. This can boost total energy output, especially in high-reflection environments or elevated installations. 

Key advantages of bifacial panels: 

• Potential for 5–20% more energy generation than monofacial panels Glass-glass construction for superior durability and longevity 
• Better resistance to moisture and UV — ideal for Wellington’s salty sea air and Kāpiti’s coastal conditions 
• Long warranties and strong long-term performance 

Where Do Bifacial Panels Work Best? 

In Wellington and Kāpiti, bifacial panels perform best when they’re installed where light can reflect beneath them. For example: 

• On a tilt frame or racking system 
• On flat roofs in Wellington city 
• On commercial buildings with high-mounted arrays 
• Ground-mounted systems on lifestyle blocks in Ōtaki, Waikanae or Te Horo Light-coloured roofing, concrete or gravel surfaces 
• When panels sit close to a darker roof surface (common in residential homes), the extra gain from the rear side is lower. That means you still get excellent performance — just with less of the bifacial boost. 

Which Option Is Right for Your Home? 

Both panel types can deliver fantastic results. The best choice depends on: 

• Your roof type 
• Your budget 
• How much sunlight and reflection your property receives 
• Whether you want maximum performance or best value

At Cableworks Electrical, we design every solar system specifically for the property — no cookie-cutters, no sales pressure. We work with trusted brands like REC, Hyundai and Winaico, and we’ll help you decide whether monofacial or bifacial panels will give you the best return for your Wellington or Kāpiti home.