--- title: "Suntech STP605S-C78/Pmh+ Solar Panel: Specs & Datasheet | ComparePV" description: "Suntech STP605S-C78/Pmh+ solar panel. Specs: 21.60% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp605s-c78-pmh" image: "https://comparepv.com/og/panel/wuxi-suntech-power-co-ltd-stp605s-c78-pmh.png" updated: 2026-09-11 --- # Suntech STP605S-C78/Pmh+ Middle of its segment, weak in heat 1,085 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Suntech - **Model:** STP605S-C78/Pmh+ - **Series:** Ultra V Plus - **Rated power:** 605 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1085 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 605 W | 620 W | Weak - bottom 15% | | | Module efficiency | 21.60% | 22.80% | Weak - bottom 2% | 7,716 | | Power density | 216.4 | 227.7 | Weak - bottom 2% | 7,665 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 1% | 8,846 | | Weight (kg) | 35.1 kg | 32.8 kg | Weak - bottom 2% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.60% | 22.80% | Weak - bottom 2% | 7,716 | | Power density | 216.4 | 227.7 | Weak - bottom 2% | 7,665 | | Temperature coefficient | -0.340 | -0.290 | Weak - bottom 1% | 8,846 | | Weight per kWp | 58.0 | 53.1 | Weak - bottom 2% | 11,606 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.340 %/°C temperature coefficient** - Bottom 1% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 8,846th in the whole database. - **58.0 kg per kWp** - Bottom 2% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 11,606th in the whole database. - **21.60% module efficiency** - Bottom 2% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 7,716th in the whole database. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Hot climates, weight-limited structures and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 605 W - **Efficiency:** 21.60 % - **Voltage at Pmax (Vmp):** 45.87 V - **Current at Pmax (Imp):** 13.19 A - **Open-circuit voltage (Voc):** 54.32 V - **Short-circuit current (Isc):** 14.09 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 technology:** TOPCon - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 35.1 kg - **Area:** 2.80 m2 - **Power density:** 216.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 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:** 514 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7716 of 14129 | | Power density | 7665 of 14129 | | Temperature coefficient | 8846 of 14129 | | Weight | 11606 of 14129 | | Warranty | 21 of 14129 | ## About this series Ultra V Plus is a series of **bifacial dual-sided modules** designed for investors who want to maximize energy yield from every square meter of roof or ground-mounted installation space. The panel uses **monocrystalline half-cut cells** arranged in a 6x26 layout, which reduces power losses from partial shading and improves reliability under demanding irradiance conditions. Thanks to multi-busbar technology and Suntech's proprietary current-sorting process, the module effectively eliminates electrical mismatch between cells, translating into a real increase in energy output from the system. The rear-side design allows for additional energy capture from light reflected off the ground, making the series particularly attractive for installations on bright surfaces, flat roofs, or ground-mount systems. The panels stand out with a **low power temperature coefficient**, losing less performance on hot days compared to competing solutions, along with strong output in low-light conditions such as mornings or overcast weather. The module has passed extended wind and snow load testing, confirming its durability in demanding climate conditions. The series is backed by a **30-year linear warranty** and low annual power degradation, making it a solid choice for both residential installations and large-scale commercial solar farm projects. ## Notable figures - Efficiency of 21.6% is 1.2pp below the \*\*TOPCon 600-650W\*\* median (22.8%) - 216.4 W/m² power density is 11.3 W/m² below \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - requires larger installation area - Temperature coefficient of -0.34%/°C is 0.05pp worse than \*\*TOPCon 600-650W\*\* median (-0.29%/°C) - higher losses in summer heat - At 35.1 kg (2.3 kg above \*\*TOPCon 600-650W\*\* median of 32.8 kg), requires checking roof load capacity - Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface ## Questions ### What is the maximum power output of the Suntech Ultra V Plus panel? Modules in the Ultra V Plus series reach a maximum power of up to 605 Wp. This high output comes from monocrystalline half-cut TOPCon cells, which deliver higher conversion efficiency than older PERC-based designs while keeping module dimensions comparable to standard panels. ### What warranty does Suntech offer on the Ultra V Plus series? The manufacturer provides a 15-year product warranty and a 30-year linear power warranty. This means that after 30 years of operation the module is guaranteed to still deliver a minimum specified power output, which is standard for modern TOPCon-based panels. ### Is the Suntech Ultra V Plus a bifacial (dual-sided) panel? No, this version of the Ultra V Plus is a monofacial module. It uses TOPCon technology with half-cut cells, but energy is generated only from the front side, unlike the bifacial variants in Suntech's Ultra V Pro lineup, where the rear side also contributes to power output. ### What is TOPCon technology and how does it differ from PERC? TOPCon (Tunnel Oxide Passivated Contact) is an n-type cell technology with an additional passivation layer that reduces carrier recombination and increases conversion efficiency compared to older p-type PERC cells. In practice this results in higher module power, a lower temperature coefficient, and slower annual power degradation over time. ### Is the Suntech Ultra V Plus suitable for large commercial and utility-scale solar farms? Yes, the high unit power of up to 605 Wp combined with a large cell format makes the series well suited to commercial rooftop installations as well as ground-mount systems and utility-scale solar farms, where maximizing energy yield per unit of land area matters most. ### Is Suntech a Tier 1 manufacturer, and is it worth buying panels from a Chinese producer? Suntech is classified as a Tier 1 manufacturer, indicating financial stability, in-house production lines, and a long-standing presence in the global market. The company is headquartered in China, but its modules are certified to European (IEC) standards and widely deployed across Poland and other EU markets, supporting warranty service availability. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/STP585-605S-C78-Pmh_EN-c0652731fee5.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.4 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.2 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +3.2 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.0 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, lighter, +3.0 pp | | [Suntech STP570S-C78/Pmh+](https://comparepv.com/panel/suntech-stp570s-c78-pmh) | 570 W | -35 W, -1.2 pp | | [Suntech STP570S-C78/Pmhg](https://comparepv.com/panel/suntech-stp570s-c78-pmhg) | 570 W | Lighter, -1.2 pp, -5 yr warranty | | [Suntech STP575S-C78/Pmh+](https://comparepv.com/panel/suntech-stp575s-c78-pmh) | 575 W | -30 W, -1.0 pp | | [Suntech STP575S-C78/Pmhg](https://comparepv.com/panel/suntech-stp575s-c78-pmhg) | 575 W | Lighter, -1.0 pp, -5 yr warranty | | [Suntech STP580S-C78/Pmh+](https://comparepv.com/panel/suntech-stp580s-c78-pmh) | 580 W | -25 W, -0.9 pp | | [Suntech STP580S-C78/Pmhg](https://comparepv.com/panel/suntech-stp580s-c78-pmhg) | 580 W | Lighter, -0.8 pp, -5 yr warranty | | [Suntech STP585S-C78/Pmh+](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp585s-c78-pmh) | 585 W | -20 W, -0.7 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +75 W, cooler, +3.6 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +70 W, cooler, +3.4 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +95 W, cooler, +3.4 pp | --- Source: https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp605s-c78-pmh Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.