--- title: "DualSun SPRING4 425 TOPCon F 425W Solar Panel - Specs & Review | ComparePV" description: "DualSun SPRING4 425 TOPCon F 425W solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/huasun-spring4-425-topcon-f" updated: 2026-09-11 --- # DualSun SPRING4 425 TOPCon F Middle of its segment, heavy for its output 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** DualSun - **Model:** SPRING4 425 TOPCon F - **Series:** SPRING4 TOPCon F - **Rated power:** 425 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 425 W | 435 W | Typical | | | Module efficiency | 21.80% | 22.00% | Typical | 7,022 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 10% | 8,005 | | Weight (kg) | 36.4 kg | 22.0 kg | Weak - bottom 1% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.80% | 22.00% | Typical | 7,022 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 10% | 8,005 | | Weight per kWp | 85.6 | 51.4 | Weak - bottom 1% | 13,828 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **85.6 kg per kWp** - Bottom 1% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 13,828th in the whole database. - **-0.310 %/°C temperature coefficient** - Bottom 10% of the TOPCon 400-450 W segment, against a median of -0.290. - **Best for:** Residential and shaded-installations. - **Not ideal for:** Weight-limited structures and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 425 W - **Efficiency:** 21.80 % - **Voltage at Pmax (Vmp):** 33.75 V - **Current at Pmax (Imp):** 12.60 A - **Open-circuit voltage (Voc):** 39.35 V - **Short-circuit current (Isc):** 13.33 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.310 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.038 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 71 mm - **Weight:** 36.4 kg - **Area:** 1.95 m2 - **Power density:** 217.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 10 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **Output after 30 years:** 371 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7022 of 14005 | | Power density | 7172 of 14005 | | Temperature coefficient | 8005 of 14005 | | Weight | 13828 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Unique PVT Technology — 6–8× More Useful Energy per m²** - The SPRING4 TOPCon F integrates both electricity generation (425 Wp) and thermal energy output (940 W thermal power at STC) in a single module, achieving a seasonal system COP of 8.5 when paired with a heat pump. Compared to a conventional PV installation, the system delivers 6–8× more useful energy from the same roof area — a performance level unmatched by any direct peer comparable (Hyundai, Trina, Tongwei). - **21.8% Efficiency — Highest in Its Segment** - The module achieves 21.8% efficiency, outperforming direct competitors: Hyundai DG G12 PERC Shingled (21.4%), Tongwei TERRA 5K (21.4%), and Trina Vertex S (21.3%). The TOPCon half-cut cell technology also delivers a low temperature coefficient of -0.31 %/°C, translating into meaningfully higher real-world energy yield in Central European climates compared to PERC-based modules. - **30-Year Linear Power Warranty: 87.4%** - The manufacturer guarantees a minimum of 87.4% of nominal power output after 30 years of operation. Furthermore, rear-side liquid cooling of the heat exchanger lowers cell operating temperature, which — according to DualSun data — increases electrical yield by approximately 6% relative to identical cells in a standard PV module. - **EU Manufacturing (France, Lyon Area)** - The panel is designed and manufactured at DualSun's facility in France, eliminating the supply chain risks associated with long-distance sourcing from Asia, facilitating access to technical support across the European market, and meeting the eligibility requirements of subsidy programs that favor EU-based manufacturers. - **Aerospace-Grade Aluminum Heat Exchanger — End-of-Life Recyclability** - The finned heat exchanger, with a 6.4 m² heat transfer surface area, is fabricated from a fully recyclable aluminum alloy, in compliance with the EU Circular Economy Action Plan. Aluminum supports an unlimited number of recycling cycles without loss of material properties — an increasingly important consideration given tightening environmental requirements for PV installations. ## Cons - **Weight 36.3 kg — Approximately 50% Heavier Than Standard** - The module weighs 36.3 kg with dimensions of 1722×1134×71 mm, whereas comparable 425 Wp PV modules (Trina Vertex S, Tongwei TERRA 5K) typically weigh 22–24 kg. Each module adds approximately 13 kg of extra dead load to the roof structure, necessitating a structural load-bearing assessment for every installation and potentially ruling out deployment on lighter timber-framed roofs without additional reinforcement. - **Complex Installation — Dedicated Glycol-Water Circuit Required** - The Finned variant requires a dedicated glycol loop, a brine-to-water heat pump, and certified installers with proven PVT system experience. The total installed cost of a PVT + heat pump system is substantially higher than that of a standard PV installation, and the pool of contractors with the necessary competencies in Poland remains limited compared to installers of conventional PV panels. - **10-Year Product Warranty — Below Market Standard** - DualSun provides a 10-year product warranty, while Trina Solar Vertex S carries a 15-year warranty and the Hyundai DG G12 a 12-year warranty. The shorter coverage period for manufacturing defects is particularly noteworthy given the module's dual function (electrical and thermal) and the presence of the heat exchanger as an additional component susceptible to failure. ## About this series The **DualSun SPRING4 TOPCon F** series is a revolutionary hybrid PV (photovoltaic-thermal) panel that combines electricity generation with heat recovery in a single module - a capability unattainable for standard PV panels. The core of the design is a **honeycomb heat exchanger made of aerospace-grade aluminum** with a heat exchange area of 6.4 m², which captures solar energy even at low temperatures, ensuring stable operation throughout the year. The panels are equipped with **TOPCon Half-Cut solar cells** - a next-generation technology with a low temperature coefficient, which translates to higher efficiency in the Polish climate. The "Finned" version is specifically designed for use with **solar-water heat pumps (glycol-water)**, eliminating the need for external units or geothermal wells. Compared to traditional PV systems, the system can generate up to 6-8 times more energy from the same roof area. This is an ideal solution for investors seeking **complete energy independence for their homes** - both in terms of electricity, heating, and hot water. The panels meet recycling requirements, aligning with circular economy standards. ## Notable figures - Efficiency of 21.8% matches the \*\*TOPCon 400-450W\*\* median - Power density of 217.6 W/m² matches the \*\*TOPCon 400-450W\*\* median - -0.31%/°C temperature coefficient - 0.02pp worse than \*\*TOPCon 400-450W\*\* median (-0.29%/°C), expect higher hot weather losses - At 36.4 kg (14.4 kg above \*\*TOPCon 400-450W\*\* median of 22.0 kg), requires checking roof load capacity - #7022 for efficiency, #8005 for temperature performance out of 14005 panels ## Questions ### How does the DualSun SPRING4 TOPCon F differ from a conventional photovoltaic panel? The DualSun SPRING4 TOPCon F is a hybrid PVT (photovoltaic-thermal) panel — it generates both electricity and heat simultaneously. The Finned variant features a finned heat exchanger made from aerospace-grade aluminum with a heat transfer surface area of 6.4 m², which captures solar energy and transfers it to the heat-transfer fluid. A conventional PV panel dissipates that energy as thermal losses. As a result, the same roof area can yield up to 6–8 times more usable energy than standard photovoltaic panels alone. ### Which heat pump is the DualSun SPRING4 TOPCon F compatible with? The Finned variant is purpose-built for brine-to-water (glycol-to-water) heat pumps, also known as ground-source heat pumps. The panel replaces the conventional low-temperature heat source — no geothermal boreholes or outdoor air unit are required. The working fluid (glycol) circulates directly through the panel's heat exchanger, delivers heat to the heat pump, and returns to the circuit. Maximum operating pressure is 6 bar, and the fluid volume within a single module is 3.57 liters. ### What is the electrical efficiency of the DualSun SPRING4 TOPCon F, and does it perform well in the Polish climate? The panel achieves a peak output of 425 Wp with a photovoltaic efficiency of 21.8%. The TOPCon Half-Cut cells feature a low temperature coefficient, which means reduced power losses during hot weather and improved performance on the overcast days typical of Poland. The finned heat exchanger operates efficiently even at low ambient temperatures, ensuring stable heat output throughout the year — including during winter months. ### What warranty is provided for the DualSun SPRING4 TOPCon F panels? The manufacturer offers a 10-year product warranty covering material and workmanship defects, along with a 30-year power output warranty. After 30 years, the panel is guaranteed to retain at least the minimum power specified in the datasheet. DualSun manufactures its panels at its own facility near Lyon, France, which ensures stringent quality control and makes the warranty commitments credible and enforceable. ### Can the DualSun SPRING4 TOPCon F be installed on a typical pitched roof in Poland? Yes, the panel is designed for rooftop installation, including pitched roofs. However, it requires a hydraulic circuit connecting the heat exchanger to the heat pump, so installation should be carried out by a contractor experienced in both PV systems and solar-assisted heat pump installations. When selecting the tilt angle and azimuth, standard PV installation guidelines for Poland apply — an optimal orientation of 30–45° facing south is recommended. ### Are the DualSun SPRING4 TOPCon F panels environmentally friendly, and what does recyclability compliance mean? Yes, the SPRING4 TOPCon F series meets recyclability requirements and aligns with circular economy standards. The heat exchanger is manufactured from aerospace-grade aluminum, which is fully recyclable. DualSun, headquartered in France, designs its panels in compliance with European environmental regulations. Furthermore, the PVT configuration inherently reduces the overall carbon footprint of the installation compared to separate, standalone PV and solar thermal systems. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/dualsun-en-datasheet-spring4-425-topcon-finned-e6dd248dadfc.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | 15 kg lighter, +2.2 pp, +10 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +40 W, 16 kg lighter, +2.0 pp | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, 17 kg lighter, +2.0 pp | | [Tongwei TWMNH-48HW475](https://comparepv.com/panel/tongwei-solar-twmnh-48hw475) | 475 W | +50 W, lighter, +2.0 pp | | [Astronergy CHSM48RN(DG)/F-BH-475](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm48rn-dg-f-bh-475) | 475 W | +50 W, lighter, +2.0 pp | | [AIKO AIKO-A475-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a475-mce54mw) | 475 W | +50 W, 15 kg lighter, +2.0 pp | | [AIKO AIKO-A475-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a475-mah54mw) | 475 W | +50 W, lighter, +2.0 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +85 W, lighter, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +70 W, 15 kg lighter, +3.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +80 W, lighter, +2.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +65 W, 15 kg lighter, +2.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +75 W, lighter, +2.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +75 W, 15 kg lighter, +2.7 pp | --- Source: https://comparepv.com/panel/huasun-spring4-425-topcon-f Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.