PERC vs TOPCon vs HJT: Which Solar Panel Technology Is Best in 2026?
PERC, TOPCon, and HJT are the three mainstream solar panel technologies available in Singapore in 2026. TOPCon is the recommended choice for most homeowners: meaningfully more efficient than PERC at a modest cost premium, with a better temperature coefficient for Singapore's heat.
Key Takeaways
- 1
TOPCon panels offer 1 to 3% more efficiency than standard PERC at a cost premium of S$500 to S$1,000 for a 10kWp system — the sweet spot for most Singapore homeowners
- 2
HJT panels have the lowest temperature coefficient (-0.25°C vs -0.35°C for PERC), making them the best performer in Singapore's heat, but cost S$2,000 to S$3,000 more than PERC
- 3
Standard PERC remains a solid, cost-effective choice: lower upfront cost, well-proven 15-year track record, and widely available from EMA-approved brands
Three solar panel technologies compete for the same Singapore rooftops in 2026: PERC, TOPCon, and HJT. All three are monocrystalline silicon. All three are available from brands on the EMA approved equipment list. The differences between them, in efficiency, heat tolerance, degradation rate, and price, are real and they affect your system's output and total 25-year return. This is the comparison that tells you which to choose for a Singapore landed home.
What These Technologies Actually Change
All three technologies start with the same basic silicon wafer. The differences are in how the cell surface is engineered to reduce energy loss. PERC (Passivated Emitter and Rear Cell) adds a reflective layer on the back of the cell to recapture photons that would otherwise pass through. TOPCon (Tunnel Oxide Passivated Contact) adds a thin oxide layer and doped polysilicon to further reduce electron recombination at the cell surface. HJT (Heterojunction Technology) sandwiches a thin-film amorphous silicon layer between the cell surfaces, which almost eliminates surface recombination and produces the best temperature response of any silicon-based technology.
These engineering differences produce three measurable outcomes that matter for Singapore: efficiency per square metre, how much efficiency drops as panels heat up, and how fast the panels degrade over 25 years.
Side-by-Side: PERC, TOPCon, and HJT for Singapore
| Metric | PERC | TOPCon ★ | HJT |
|---|---|---|---|
| Panel efficiency | 20–21% | 22–23% | 23–25% |
| Temperature coefficient | -0.35%/°C | -0.30%/°C | -0.25%/°C |
| Typical 25-yr degradation | 0.50%/yr | 0.40%/yr | 0.30%/yr |
| Bifacial option available | Yes (some models) | Yes (most models) | Yes |
| Cost premium vs PERC (10kWp) | Baseline | S$500–S$1,000 | S$2,000–S$3,000 |
| Singapore verdict | Budget-conscious installs | Best for most homes ★ | Space-constrained roofs |
The Singapore-Specific Consideration: Heat
Singapore panels run hot. On a clear afternoon, cell temperatures reach 45 to 55°C depending on how well-ventilated the racking is. Every degree above 25°C reduces output by the panel's temperature coefficient. This is where HJT's -0.25%/°C coefficient becomes tangible compared to PERC's -0.35%/°C: at 50°C cell temperature (25°C above STC), PERC loses 8.75% of rated output, while HJT loses 6.25%.
Over a year in Singapore, this 2.5 percentage point difference translates to roughly 250 kWh per year for a 10kWp system, approximately S$83 per year in additional savings. Over 25 years: about S$2,075 in extra value from HJT's heat tolerance, against a S$2,000 to S$3,000 higher upfront cost. For most homeowners, the HJT premium barely pays for itself on heat tolerance alone. The real case for HJT is when roof space is limited and you need maximum watts per square metre. HJT fits more power in fewer panels.
TOPCon is not the best technology available in 2026. It is the best technology at the price point that makes a Singapore solar investment clearly worthwhile. HJT is better — but only if you need every watt per square metre.
For the majority of Singapore terrace and semi-D rooftops with adequate usable area (40 sqm or more), TOPCon is the recommendation. The S$750 average premium over PERC returns approximately S$2,900 in extra energy over 25 years, a net positive. If your roof is genuinely constrained (under 30 sqm usable, heavy shading on three sides), HJT justifies its premium through maximum watts per panel. PERC is a legitimate choice for the most budget-sensitive installations where getting the system in now matters more than squeezing every kWh out of the roof.
Verify any panel model your installer quotes against the EMA approved equipment list. The Sunnify estimate tool uses technology-appropriate yield assumptions for your roof.
Further reading: EMA approved solar equipment list · IRENA solar technology brief.
Are TOPCon and HJT panels available from EMA-approved brands in Singapore?
Yes. Several major manufacturers offer TOPCon and HJT panels that are or are becoming available in Singapore through registered installers. LONGi, Jinko, and Trina have TOPCon panels on or in the process of getting EMA approval. Huasun and REC Group offer HJT options. Always verify the specific model number against the current EMA approved equipment list before signing a contract, the list is updated quarterly and approval status can change.
Will TOPCon become cheaper than PERC in the next few years?
TOPCon manufacturing capacity has expanded very rapidly since 2022, and the cost premium over PERC has already narrowed from S$1,500+ to S$500–S$1,000 for a 10kWp system. Some analysts expect TOPCon to largely replace PERC as the standard technology by 2027–2028, with pricing converging. If this happens, PERC panels may face slightly faster warranty service depreciation. For a system installed in 2026, TOPCon is already the practical standard-bearer, not a premium choice requiring justification.
See your numbers
What does this mean for your home?
Tariffs and technology change the math. The calculator uses current SP figures to show your actual payback and savings.
