Exotronic Horizon (PERC) vs Exotronic Fusion (TOPCon) Compared
The solar industry is rapidly evolving, with PERC and TOPCon technologies leading the charge. But how do these innovations translate to real-world performance, and which one is right for your energy needs?
In this guide, we’ll compare the Exotronic Horizon Series (featuring PERC modules) and the Exotronic Fusion Series (equipped with TOPCon solar modules). Explore their efficiency, durability, costs, and long-term value to help you decide whether upgrading to TOPCon is worth the investment—or if PERC remains the practical choice.
Understanding Solar Panel Efficiency
Solar panel efficiency refers to the percentage of sunlight a panel converts into usable electricity. Higher efficiency means more power from the same surface area—critical for off-grid systems with limited roof space (e.g., RVs, boats, or tiny homes).
What is PERC Technology?
PERC (Passivated Emitter and Rear Cell) enhances traditional solar cells by adding a passivation layer on the rear side. This layer reflects unabsorbed light back into the cell, improving efficiency and reducing energy loss.
- Efficiency gains: ~21–23% efficiency, outperforming older cell types.
- Market popularity: Dominates solar production due to reliability and cost-effectiveness.
- Why it’s loved: Affordable, durable, and easy to integrate into existing systems.
What is TOPCon Technology?
TOPCon (Tunnel Oxide Passivated Contact) is an advanced cell architecture with a tunnel oxide and doped polysilicon rear layer that improves electron pass-through and reduces recombination losses.
- Efficiency leap: ~23-25% efficiency, with lab records surpassing 26%.
- Smaller footprint: Delivers the same output in less space.
- Top advantages: Improved temperature handling, lower long-term degradation, and superior low-light performance.
- Long-term value: More energy over time with lower levelized cost of energy (LCOE).
Exotronic Horizon (PERC) vs Exotronic Fusion (TOPCon): Head-to-Head Comparison
| Factor | Standard Polycrystalline | Standard Monocrystalline | Exotronic Horizon (PERC) | Exotronic Fusion (TOPCon) |
|---|---|---|---|---|
| Efficiency | 15-19% | 18-21% | 23% | 25.20% |
| Temp Coefficient | -0.45% / °C | -0.45% / °C | -0.35% / °C | -0.29% / °C |
| Degradation Rate | 0.7% annual loss | 0.5% annual loss | 0.5% annual loss | 0.3% annual loss |
| Weight | Standard weight (heavier than lightweight panels) | Standard weight (heavier than lightweight panels) | 20% lighter than general glass | 25% lighter than general glass |
| Durability | Moderate durability; less tolerant to heat and weather | High durability; performs well in most conditions | Performs well in mild climates; loses efficiency in extreme heat | Maintains output in hot, humid, and dusty conditions |
Exotronic Horizon (PERC) Range
- Exotronic Horizon 20W Fixed Solar Panel
- Exotronic Horizon 40W Fixed Solar Panel
- Exotronic Horizon 70W (Narrow) Fixed Solar Panel
- Exotronic Horizon 75W Fixed Solar Panel
- Exotronic Horizon 110W Fixed Solar Panel
- Exotronic Horizon 120W Fixed Solar Panel
- Exotronic Horizon 180W Fixed Solar Panel
- Exotronic Horizon 200W Fixed Solar Panel
- Exotronic Horizon 225W Fixed Solar Panel – Shade Resistant
Exotronic Fusion (TOPCon) Range
- Exotronic Fusion 45W Fixed Solar Panel
- Exotronic Fusion 100W Fixed Solar Panel
- Exotronic Fusion 200W Fixed Solar Panel
- Exotronic Fusion 220W Fixed Solar Panel
- Exotronic Fusion 250W Fixed Solar Panel
(Click the product image above to view pricing details.)
The Bottom Line
For off-grid adventurers—RV/Caravan, Tiny Home, Boat, or 4WD owners—the choice between Horizon (PERC) and Fusion (TOPCon) depends on your energy demands and usage habits.
- Choose Exotronic Horizon (PERC) if:
- You want real world proven technology
- You need high efficiency power output
- You value quick return on investment
- Choose Exotronic Fusion (TOPCon) if:
- You live off-grid or travel extensively where every watt matters.
- You want the most recent and advanced technology.
- You want higher energy yield and future-proof performance with less dependence on generators.
Still unsure? Whether you're retrofitting a 4WD for weekend escapes or building a self-sufficient tiny home, our technical sales team can help design a system tailored to your journey. Let’s power your adventures—wherever they take you!
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