Short answer
TOPCon bifacial panels are N-type solar modules with tunnel oxide passivated contact cells that capture sunlight on both the front and the back. They generate more power from the same roof area than older panel types.
Key Takeaways
- TOPCon stands for tunnel oxide passivated contact.
- TOPCon cells are made on N-type silicon wafers.
- Bifacial panels also generate from light reflected onto their back side.
- An open, elevated frame lets more reflected light reach the back of the panels.
- SolarSpot panels carry a 30-year manufacturer performance warranty.
What Does TOPCon Mean?
TOPCon stands for tunnel oxide passivated contact. It is a solar cell design that adds a very thin oxide layer and a doped silicon layer to the back of an N-type cell, which reduces energy losses and raises efficiency.
What Is a Bifacial Solar Panel?
A bifacial solar panel has cells that respond to light on both sides. The front faces the sun, and the back collects light reflected from the roof surface, walls, and surroundings, which adds extra generation.
Why Do Bifacial Panels Need an Elevated Structure?
The back of a bifacial panel can only generate if reflected light reaches it. An elevated, open frame leaves space under the panels for light to bounce up, and it also lets air flow around the panels, which keeps them cooler and helps them produce more.
How Do TOPCon Panels Compare with Older Panel Types?
| Feature | N-type TOPCon bifacial | Older P-type monofacial |
|---|---|---|
| Cell base | N-type silicon | P-type silicon |
| Light capture | Front and back | Front only |
| Output from the same roof area | Higher | Lower |
| Best mounting | Elevated, open frame | Any frame |
General comparison. Actual output depends on the panel model, site, and installation.
The Bottom Line
TOPCon bifacial panels are N-type solar modules with tunnel oxide passivated contact cells that capture sunlight on both the front and the back. They generate more power from the same roof area than older panel types. SolarSpot pairs N-type TOPCon bifacial panels with its elevated OCTASHIELD structure so both sides of each panel can generate.