--- title: "Suntech STP300-60/Wfh Solar Panel: Specs & Datasheet | ComparePV" description: "Suntech STP300-60/Wfh solar panel. Specs: 17.80% efficiency, Polycrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/suntech-stp300-60-wfh" image: "https://comparepv.com/og/panel/suntech-stp300-60-wfh.png" updated: 2026-09-11 --- # Suntech STP300-60/Wfh Middle of its segment, weak in heat 1,828 panels in the 200-400 W band, all technologies ## Identity - **Manufacturer:** Suntech - **Model:** STP300-60/Wfh - **Series:** SuperPoly - **Rated power:** 300 W - **Cell technology:** Polycrystalline ## How it compares Compared against 200-400 W band, all technologies (1828 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 300 W | 355 W | Weak - bottom 20% | | | Module efficiency | 17.80% | 19.40% | Typical | 13,377 | | Power density | 177.8 | 193.6 | Typical | 13,372 | | Temperature coefficient | -0.380 | -0.354 | Weak - bottom 20% | 13,477 | | Weight (kg) | 19.0 kg | 20.8 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 17.80% | 19.40% | Typical | 13,377 | | Power density | 177.8 | 193.6 | Typical | 13,372 | | Temperature coefficient | -0.380 | -0.354 | Weak - bottom 20% | 13,477 | | Weight per kWp | 63.3 | 59.5 | Typical | 12,981 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,912 | ### Watch out for - **-0.380 %/°C temperature coefficient** - Bottom 20% of the 200-400 W band, against a median of -0.354. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 300 W - **Efficiency:** 17.80 % - **Voltage at Pmax (Vmp):** 32.70 V - **Current at Pmax (Imp):** 9.18 A - **Open-circuit voltage (Voc):** 39.40 V - **Short-circuit current (Isc):** 9.62 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.380 %/degC - **Temperature coefficient of Voc:** -0.321 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Polycrystalline - **Cell count:** 120 ### Physical - **Length:** 1684 mm - **Width:** 1002 mm - **Thickness:** 35 mm - **Weight:** 19.0 kg - **Area:** 1.69 m2 - **Power density:** 177.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 80.2 % - **First-year degradation:** 2.50 % - **Annual degradation:** 0.70 % - **Output after 30 years:** 232 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 13377 of 14129 | | Power density | 13372 of 14129 | | Temperature coefficient | 13477 of 14129 | | Weight | 12981 of 14129 | | Warranty | 9912 of 14129 | ## About this series The SuperPoly series consists of 120-cell polycrystalline modules built with half-cut cell technology, designed for installations where consistent output matters despite variable sunlight conditions. Splitting the cells in half reduces losses from current mismatch and lowers electrode resistance, allowing the panels to maintain **high conversion efficiency** even when part of the surface is shaded. Suntech applies its proprietary current sorting process, which further minimizes mismatch loss within a string - a feature rarely found among competitors in this price segment. The series also stands out for its **excellent performance in low-light conditions**, which matters on cloudy days and during early morning or evening hours when the angle of incidence is unfavorable. A lower cell operating temperature combined with a favorable temperature coefficient results in smaller power drops on hot days. The construction has passed tests for extreme **wind and snow load resistance**, while the frame and **IP68**-rated junction box ensure a tight seal in coastal, desert, and farmland installations. Thanks to **high PID resistance** and double electroluminescence inspection, the modules maintain stable parameters throughout their entire service life. This is a solution for installers seeking a proven, cost-effective half-cut polycrystalline technology that combines reliability with a long-term manufacturer warranty. ## Notable figures - Module efficiency of 17.8% is 4.0pp below average for \*\*database\*\* panels (median: 21.8%) - Power density of 177.8 W/m² is 40.3 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - Temperature coefficient of -0.38%/°C is 0.08pp worse than \*\*database\*\* median (-0.30%/°C) - higher losses in summer heat - 19.0 kg weight - 7.5 kg lighter than \*\*database\*\* median (26.5 kg), reducing installation effort - #13377 for efficiency, #13477 for temperature performance out of 14129 panels ## Questions ### What is the maximum power output of Suntech SuperPoly panels, and how many modules are needed for a typical 5 kW system? SuperPoly series panels reach a maximum power output of up to 360 Wp. To build a system of around 5 kW, roughly 14 modules are needed. Thanks to half-cut cell technology, the modules maintain high conversion efficiency even under partial shading, allowing for more precise panel layout planning on the roof. ### How does half-cut cell technology in Suntech SuperPoly differ from standard full-size cells? In half-cut cell technology, cells are cut in half, reducing current mismatch losses and lowering electrode resistance. As a result, the SuperPoly panel handles partial shading better, for example from a chimney or antenna, and loses less power than full-cell modules under the same conditions. ### What warranty comes with Suntech SuperPoly panels? The manufacturer provides a 12-year product warranty and a 25-year power output warranty. This means Suntech, a tier 1 manufacturer based in China, guarantees a defined performance level for the panels over a quarter century, which is standard for installations with a long payback period. ### Are Suntech SuperPoly panels suitable for coastal or desert installations? Yes, the frame and junction box are rated IP68, providing resistance to moisture, salt, and dust. The construction has also passed extreme wind and snow load tests, making the modules well suited for coastal, agricultural, and desert installations alike. ### What is current sorting in Suntech panels, and why does it matter when connecting modules into a string? Current sorting is Suntech's proprietary process of grading cells by current before module assembly. This ensures cells with matching electrical parameters are paired together, minimizing mismatch loss within a string. This solution is rarely found in this price segment and translates into higher real-world energy yield. ### Do Suntech SuperPoly panels perform well under low irradiance and higher temperatures? Yes, the SuperPoly series performs well under low irradiance, which matters on cloudy days and during morning and evening hours. Its favorable temperature coefficient also limits power losses on hot days, and high PID resistance ensures stable parameters throughout the module's service life. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/EN_SuperPoly_STP300_60_Wfh-dddae2d1c89f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [SunLink LNSK-340M](https://comparepv.com/panel/sunlink-lnsk-340m) | 340 W | +40 W, cooler, +2.3 pp | | [Canadian Solar CS3K-330P](https://comparepv.com/panel/canadian-solar-cs3k-330p) | 330 W | +30 W, cooler, +2.1 pp | | [Canadian Solar CS3K-335MB-AG](https://comparepv.com/panel/canadian-solar-cs3k-335mb-ag) | 335 W | +35 W, +2.1 pp, +5 yr warranty | | [SunLink LNSK-335M](https://comparepv.com/panel/sunlink-lnsk-335m) | 335 W | +35 W, cooler, +2.0 pp | | [Canadian Solar CS3K-325P](https://comparepv.com/panel/canadian-solar-cs3k-325p) | 325 W | +25 W, cooler, +1.8 pp | | [SunLink LNSK-330M](https://comparepv.com/panel/sunlink-lnsk-330m) | 330 W | +30 W, cooler, +1.7 pp | | [Canadian Solar CS3K-320P](https://comparepv.com/panel/canadian-solar-cs3k-320p) | 320 W | +20 W, cooler, +1.5 pp | | [Suntech STP290-60/Wfh](https://comparepv.com/panel/suntech-stp290-60-wfh) | 290 W | -10 W, -0.6 pp | | [Suntech STP295-60/Wfh](https://comparepv.com/panel/suntech-stp295-60-wfh) | 295 W | -0.3 pp | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +140 W, cooler, +5.1 pp | | [Jetion JT435SYk(B)](https://comparepv.com/panel/jetion-jt435syk-b) | 435 W | +135 W, cooler, +4.9 pp | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +4.8 pp, +15 yr warranty | | [Jetion JT430SYk(B)](https://comparepv.com/panel/jetion-jt430syk-b) | 430 W | +130 W, cooler, +4.6 pp | | [Lina Energy LEPV 400](https://comparepv.com/panel/lina-energy-lepv-400) | 400 W | +100 W, cooler, +4.5 pp | | [Phono Solar NS-360MH-60](https://comparepv.com/panel/phono-solar-ns-360mh-60) | 360 W | +60 W, cooler, +4.3 pp | | [PolyCrown Solar Tech NS-360MH-60](https://comparepv.com/panel/polycrown-solar-tech-ns-360mh-60) | 360 W | +60 W, cooler, +4.3 pp | --- Source: https://comparepv.com/panel/suntech-stp300-60-wfh Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.