The volume workhorse,
measured.
Tunnel oxide passivated contact cells on an N-type base: the technology that delivered the industry's dominant 2025 shipment mix — and the best cost-per-kWh a mainstream module can offer. Commercial TOPCon efficiency has reached the 24.8% class, and ems-solar builds its entire volume line around it.
| Pmax | 580 W |
|---|---|
| Efficiency | 23.1% |
| Dimensions | 2278×1134 mm |
| Warranty | 15 / 30 yr |
A passivation trick that became the mainstream
TOPCon adds an ultra-thin tunnel oxide and a doped polysilicon layer to the rear of an N-type cell. The result: carriers that no longer recombine at the rear contact, so the cell converts more of every photon. That one change buys three things buyers feel in the field:
- Higher efficiency — 22.0–23.5% at module level, versus ~21% for the PERC generation it replaced
- Lower degradation — N-type cells resist LID and LeTID, holding output in the first years
- Better heat behavior — −0.29%/°C versus ~−0.35%/°C for PERC: 0.06% less loss per degree on every hot roof
In 2025 the world shipped 536 GW of modules, and TOPCon carried most of it. It is the safe, bankable mainstream choice — which is exactly why we build it at 2 GW scale.
Six formats, one cell platform
From 430 W residential formats to 720 W utility glass. Half-cut cells, multi-busbar, 2.0+2.0 mm dual-glass as standard on bifacial versions.
| Model | Pmax | Efficiency | Dimensions | Weight | Bifaciality | Format |
|---|---|---|---|---|---|---|
| EMS-430N-108 | 430 W | 22.0% | 1762×1134 mm | 21.5 kg | — | 54-cell rooftop |
| EMS-460N-120 | 460 W | 22.5% | 1909×1134 mm | 23.0 kg | — | 60-cell rooftop |
| EMS-500N-132 | 500 W | 22.4% | 2094×1134 mm | 25.0 kg | ≥80% | 66-cell C&I |
| EMS-560N-144 | 560 W | 22.8% | 2278×1134 mm | 27.0 kg | ≥80% | 72-cell C&I |
| EMS-580N-144 | 580 W | 23.1% | 2278×1134 mm | 28.5 kg | 84.95% | 72-cell bifacial |
| EMS-620N-132 | 620 W | 23.0% | 2384×1303 mm | 32.0 kg | ≥80% | 66-cell utility |
| EMS-720N-132 | 720 W | 23.5% | 2384×1303 mm | 34.0 kg | ≥80% | 66-cell utility |
All values at STC, ±3% Pmax tolerance. Snow load 5400 Pa / wind load 2400 Pa; Class A fire rating available.
Three numbers importers quote back to us
−0.29%/°C
Six hundredths better per degree than the PERC generation. On a 45 °C desert roof that is real yield.
0.4%/yr linear
First-year ≤1%, then 0.4% per year — 87.4% of rated power guaranteed at year 30.
Tier-1 equivalent
IEC 61215/61730 + ISO 9001 + IEC 62941, with UL 61730 and TÜV/PVEL audits on request.
One platform, four site types
Residential
54/60-cell formats for pitched roofs, 21.5–23 kg install weight.
Commercial roofs
China added 212 GW in H1 2025 with C&I up 135% YoY — the format these roofs ask for.
Ground mounts
620–720 W glass-glass on trackers, matched to 1500 V strings.
Elevated canopies
Bifacial versions harvest +5–30% rear gain over reflective paving.
Before you send the RFQ
Answers to the four questions that decide a TOPCon order. The full 16-question FAQ covers MOQ, shipping and warranty terms.
Full FAQWhat is the MOQ for TOPCon modules?
Can you build to my datasheet values?
Which certificates come with the modules?
What warranty do you offer?
Spec your container today.
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