--- title: "Suntech STP595S-D60/Wmh Solar Panel: Specs & Datasheet | ComparePV" description: "Suntech STP595S-D60/Wmh solar panel. Specs: 21.00% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/suntech-stp595s-d60-wmh" image: "https://comparepv.com/og/panel/suntech-stp595s-d60-wmh.png" updated: 2026-09-11 --- # Suntech STP595S-D60/Wmh Middle of its segment, short guarantee 6,324 panels in the 495-695 W band, all technologies ## Identity - **Manufacturer:** Suntech - **Model:** STP595S-D60/Wmh - **Series:** Ultra X - **Rated power:** 595 W - **Cell technology:** Monocrystalline ## How it compares Compared against 495-695 W band, all technologies (6324 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 595 W | 590 W | Typical | | | Module efficiency | 21.00% | 22.25% | Weak - bottom 14% | 9,828 | | Power density | 210.2 | 222.5 | Weak - bottom 15% | 9,740 | | Temperature coefficient | -0.340 | -0.300 | Typical | 8,846 | | Weight (kg) | 31.5 kg | 31.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 11% | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.00% | 22.25% | Weak - bottom 14% | 9,828 | | Power density | 210.2 | 222.5 | Weak - bottom 15% | 9,740 | | Temperature coefficient | -0.340 | -0.300 | Typical | 8,846 | | Weight per kWp | 52.9 | 52.8 | Typical | 6,715 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 11% | 9,912 | ### Watch out for - **25 year performance warranty** - Bottom 11% of the 495-695 W band, against a median of 30 yrs. - **21.00% module efficiency** - Bottom 14% of the 495-695 W band, against a median of 22.25%. - **210.2 watts per square metre** - Bottom 15% of the 495-695 W band, against a median of 222.5. - **Best for:** Commercial, utility-scale, hot-climate, cold-climate and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 595 W - **Efficiency:** 21.00 % - **Voltage at Pmax (Vmp):** 34.45 V - **Current at Pmax (Imp):** 17.28 A - **Open-circuit voltage (Voc):** 41.65 V - **Short-circuit current (Isc):** 18.27 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell count:** 144 ### Physical - **Length:** 2172 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 31.5 kg - **Area:** 2.83 m2 - **Power density:** 210.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 488 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9828 of 14129 | | Power density | 9740 of 14129 | | Temperature coefficient | 8846 of 14129 | | Weight | 6715 of 14129 | | Warranty | 9912 of 14129 | ## About this series The **Ultra X** series consists of bifacial half-cut modules engineered to maximize energy yield while minimizing losses caused by current mismatch. The panels are built on large D-type silicon wafers using **PERC** cell technology combined with high-density cell packaging and multi-busbar technology, which shortens the lateral current path and effectively reduces resistive losses. Suntech's proprietary current sorting process further limits discrepancies between individual cells, resulting in higher and more stable overall system power output. The bifacial design allows the module to capture additional light reflected from the ground, boosting installation productivity without increasing the footprint. The series also stands out for its **excellent low-light performance** - on cloudy days, in the morning, or at sunset, the panels continue to generate noticeably more energy than conventional designs. The modules have passed extended wind and snow load resistance testing, making them a solid choice for installations in demanding climates, including coastal, farmland, and desert environments. Low annual power degradation combined with a **30-year linear warranty** make Ultra X a fitting solution for investors in commercial projects and large-scale ground-mount installations who expect predictable returns throughout the system's operating lifetime. ## Notable figures - Efficiency of 21.0% is 0.8pp below the \*\*database\*\* median (21.8%) - At 210.2 W/m², this panel generates 7.9 W/m² less per unit area than \*\*database\*\* median (218.1 W/m²) - -0.34%/°C temperature coefficient - 0.04pp worse than \*\*database\*\* median (-0.30%/°C), expect higher hot weather losses - Weight of 31.5 kg is 5.0 kg above \*\*database\*\* median (26.5 kg) - verify structural support - Ranked #9828 out of 14129 panels for efficiency in the database ## Questions ### What is the maximum power output of a single Suntech Ultra X panel? Suntech Ultra X panels reach a maximum power output of up to 600 Wp, placing them among large-format modules built on 210 mm wafers. This high power comes from densely packed D-type PERC cells combined with half-cut technology, which reduces resistive losses. As a result, fewer panels are needed to reach a given system capacity, lowering installation costs and the number of mounting brackets required on roofs or ground-mount racking. ### Are Suntech Ultra X panels bifacial, and how much extra energy does that generate? Yes, Ultra X modules use a bifacial design that captures light reflected off the ground through the rear side of the panel. Depending on surface albedo (light gravel, snow, white roofing), the additional energy yield can reach up to 25% compared to a standard monofacial module. The effect is most noticeable in ground-mount installations and utility-scale PV farms, where panels are installed above light-colored surfaces. ### What is multi-busbar technology and current sorting in the Ultra X series? Multi-busbar technology increases the number of thin conductive paths across the cell surface, shortening the current path and reducing resistive losses. Suntech also applies proprietary current sorting, grouping cells with closely matched electrical parameters within the same module. This limits mismatch loss, allowing the whole panel to operate closer to its theoretical maximum power instead of being held back by its weakest cell. ### What warranty covers Suntech Ultra X panels - product and power? Suntech backs the Ultra X series with a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty. This means a guaranteed, evenly distributed performance decline over time rather than the stepped degradation seen in older warranty structures. For investors in commercial and utility-scale projects, this is an important factor when calculating long-term return on investment (ROI). ### Is the Ultra X series suitable for PV farms in harsh climate conditions? Yes, Ultra X modules have passed extended wind load and snow load resistance testing, making them suitable for PV farms located on coastlines, open terrain, or desert regions with wide temperature swings. A robust frame construction combined with half-cut technology, which is less prone to microcracks under mechanical stress, results in longer, more reliable operation in harsh climate conditions. ### Does Suntech's Tier 1 manufacturer status guarantee investment security over 30 years? Suntech is listed as a Tier 1 manufacturer (BloombergNEF), reflecting documented financial stability, in-house production lines, and a track record in bankable projects financed by banks. For investors, this means lower risk related to supply quality and greater confidence in the 30-year power warranty, since the manufacturer has the real operational backing needed to honor service commitments over the entire lifespan of the installation. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/EN_Ultra_X_STP600S_D60_Wmh-cc13a0925632.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +50 W, cooler, +4.0 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, +3.8 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, +3.6 pp, +5 yr warranty | | [Suntech STP580S-D60/Pmh+](https://comparepv.com/panel/suntech-stp580s-d60-pmh) | 580 W | Heavier, -0.5 pp, +5 yr warranty | | [Suntech STP585S-D60/Pmh+](https://comparepv.com/panel/suntech-stp585s-d60-pmh) | 585 W | Heavier, -0.3 pp, +5 yr warranty | | [Suntech STP590S-D60/Pmh+](https://comparepv.com/panel/suntech-stp590s-d60-pmh) | 590 W | Heavier, +5 yr warranty | | [Suntech STP600S-D60/Pmh+](https://comparepv.com/panel/suntech-stp600s-d60-pmh) | 600 W | Heavier, +5 yr warranty | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | +85 W, +3.0 pp, +5 yr warranty | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | +80 W, +2.9 pp, +5 yr warranty | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | +75 W, cooler, +2.7 pp | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | +75 W, +2.7 pp, +5 yr warranty | | [Q-SUN Solar QN-665HJT-01](https://comparepv.com/panel/q-sun-solar-qn-665hjt-01) | 665 W | +70 W, cooler, +2.5 pp | | [Gamko New Energy GKA210N120-665](https://comparepv.com/panel/gamko-new-energy-gka210n120-665) | 665 W | +70 W, +2.5 pp, +5 yr warranty | | [Sunpro Power SPDG660-N120M12](https://comparepv.com/panel/sunpro-spdg660-n120m12) | 660 W | +65 W, +2.3 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/suntech-stp595s-d60-wmh Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.