--- title: "Suntech STP590S-D60/Pmh+ Solar Panel: Specs & Datasheet | ComparePV" description: "Suntech STP590S-D60/Pmh+ solar panel. Specs: 20.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/suntech-stp590s-d60-pmh" image: "https://comparepv.com/og/panel/suntech-stp590s-d60-pmh.png" updated: 2026-09-11 --- # Suntech STP590S-D60/Pmh+ Middle of its segment, heavy for its output 6,453 panels in the 490-690 W band, all technologies ## Identity - **Manufacturer:** Suntech - **Model:** STP590S-D60/Pmh+ - **Series:** Ultra X - **Rated power:** 590 W - **Cell technology:** Monocrystalline - **Bifacial:** yes ## How it compares Compared against 490-690 W band, all technologies (6453 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 590 W | 585 W | Typical | | | Module efficiency | 20.80% | 22.25% | Weak - bottom 9% | 10,533 | | Power density | 208.5 | 222.5 | Weak - bottom 10% | 10,435 | | Temperature coefficient | -0.340 | -0.300 | Typical | 8,846 | | Weight (kg) | 37.1 kg | 31.2 kg | Weak - bottom 2% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.80% | 22.25% | Weak - bottom 9% | 10,533 | | Power density | 208.5 | 222.5 | Weak - bottom 10% | 10,435 | | Temperature coefficient | -0.340 | -0.300 | Typical | 8,846 | | Weight per kWp | 62.9 | 52.8 | Weak - bottom 2% | 12,932 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **62.9 kg per kWp** - Bottom 2% of the 490-690 W band, against a median of 52.8. Ranked 12,932nd in the whole database. - **20.80% module efficiency** - Bottom 9% of the 490-690 W band, against a median of 22.25%. Ranked 10,533rd in the whole database. - **208.5 watts per square metre** - Bottom 10% of the 490-690 W band, against a median of 222.5. Ranked 10,435th in the whole database. - **Best for:** Commercial, utility-scale, hot-climate, cold-climate and shaded-installations. - **Not ideal for:** Weight-limited structures, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 590 W - **Efficiency:** 20.80 % - **Voltage at Pmax (Vmp):** 34.25 V - **Current at Pmax (Imp):** 17.23 A - **Open-circuit voltage (Voc):** 41.45 V - **Short-circuit current (Isc):** 18.22 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:** 120 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2172 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 37.1 kg - **Area:** 2.83 m2 - **Power density:** 208.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 501 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10533 of 14129 | | Power density | 10435 of 14129 | | Temperature coefficient | 8846 of 14129 | | Weight | 12932 of 14129 | | Warranty | 21 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 - Module efficiency of 20.8% is 1.0pp below average for \*\*database\*\* panels (median: 21.8%) - At 208.5 W/m², this panel generates 9.6 W/m² less per unit area than \*\*database\*\* median (218.1 W/m²) - At -0.34%/°C, loses 0.04pp more power per degree than \*\*database\*\* median (-0.30%/°C) - At 37.1 kg, this panel is 10.6 kg heavier than the \*\*database\*\* median (26.5 kg) - more demanding for installation crews - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof ## 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_Pmh-68f3bf3b1e1e.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +4.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +4.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | Cooler, lighter, +3.6 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | Cooler, 21 kg lighter, +3.6 pp | | [Suntech STP580S-D60/Pmh+](https://comparepv.com/panel/suntech-stp580s-d60-pmh) | 580 W | -10 W, -0.3 pp | | [Suntech STP585S-D60/Pmh+](https://comparepv.com/panel/suntech-stp585s-d60-pmh) | 585 W | Very close match | | [Suntech STP595S-D60/Pmh+](https://comparepv.com/panel/suntech-stp595s-d60-pmh) | 595 W | Very close match | | [Suntech STP600S-D60/Pmh+](https://comparepv.com/panel/suntech-stp600s-d60-pmh) | 600 W | +10 W, +0.4 pp | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | +90 W, lighter, +3.2 pp | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | +85 W, lighter, +3.1 pp | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | +80 W, cooler, +2.9 pp | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | +80 W, lighter, +2.9 pp | | [Q-SUN Solar QN-665HJT-01](https://comparepv.com/panel/q-sun-solar-qn-665hjt-01) | 665 W | +75 W, cooler, +2.7 pp | | [Gamko New Energy GKA210N120-665](https://comparepv.com/panel/gamko-new-energy-gka210n120-665) | 665 W | +75 W, lighter, +2.7 pp | --- Source: https://comparepv.com/panel/suntech-stp590s-d60-pmh Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.