--- title: "DualSun SPRING4 425 TOPCon I 425W Solar Panel - Specs & Review | ComparePV" description: "DualSun SPRING4 425 TOPCon I 425W solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dualsun-spring4-425-topcon-i" updated: 2026-09-11 --- # DualSun SPRING4 425 TOPCon I 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 I - **Series:** SPRING4 - **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) | 34.5 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 | 81.2 | 51.4 | Weak - bottom 1% | 13,760 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **81.2 kg per kWp** - Bottom 1% of the TOPCon 400-450 W segment, against a median of 51.4. Ranked 13,760th 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:** 34.5 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 | 13760 of 14005 | | Warranty | 21 of 14005 | ## Pros - **PVT Hybrid Technology – 2× More Energy per m²** - SPRING4 combines electricity generation (425 Wp) with heat capture (thermal output up to 940 W per panel). According to manufacturer data, a PVT system paired with a brine-to-water heat pump achieves a Seasonal Performance Factor (SPF) 20% higher than a conventional PV + air-source heat pump configuration, and yields at least twice as much energy per m² of roof area as a standard PV panel — a decisive advantage where roof space is limited. - **N-type TOPCon Half-Cut Cells – 21.8% Efficiency** - The 21.8% module efficiency outperforms all direct peer comparables: Hyundai DG G12 PERC Shingled (21.4%), Tongwei TERRA 5K (21.4%), and Trina Vertex S (21.3%). N-type technology eliminates the Light-Induced Degradation (LID) inherent in PERC cells and delivers superior temperature coefficients, translating to higher real-world annual yield at elevated module temperatures compared to equivalent P-type products. - **30-Year Linear Power Warranty at 87.4%** - The guarantee of 87.4% rated power after 30 years exceeds the industry-standard 25-year / 84.8% terms offered by Trina Solar Vertex S and Hyundai DG G12 PERC. Furthermore, the integrated heat exchanger actively cools the cells, reducing thermal degradation and extending the effective service life of the PV section beyond the stated warranty minimum. - **Three Variants – Tailored to Different System Types** - The series is available in an insulated version (domestic hot water and pool heating), a finned version (brine-to-water heat pump, improving heat pump COP by approximately 20–30%), and an uninsulated version (ground source heat pump borehole regeneration). This flexibility enables optimal panel-to-heating-system matching without technical compromise. - **French Manufacturing and EPD Certification** - The panel is manufactured at the DualSun facility near Lyon (in operation since 2010), ensuring full supply chain traceability and compliance with European standards. The Environmental Product Declaration (EPD-IES-0017461) and an end-of-life material recycling program support compliance with EU sustainable construction regulations, including the Energy Performance of Buildings Directive (EPBD) and the EU Taxonomy. ## Cons - **Thermal Warranty Limited to 10 Years** - The hydraulic component — specifically the heat exchanger — carries only a 10-year product warranty, compared to 30 years for the PV section. The heat exchanger is exposed to corrosion, working-fluid contamination, and micro-cracking; any failure beyond the 10-year warranty period places the full cost of repair or replacement on the system owner. - **Complex Installation Requires Two Trades** - Commissioning the SPRING4 integrates electrical work (PV) with plumbing (solar fluid or brine circuit), requiring either a crew with dual competencies or the coordination of two independent contractors. This increases installation costs and raises the risk of interface errors between the two subsystems compared to a standard PV-only installation. ## About this series The **DualSun SPRING4** series is a revolutionary hybrid PVT (photovoltaic-thermal) panel that combines electricity generation with heat recovery in a single device. This allows for up to twice the energy production from the same roof area compared to traditional photovoltaic panels. The technology is based on **N-Type TOPCon Half-Cut monocrystalline solar cells**, which provide exceptional conversion efficiency and better performance in low-light conditions. The panel also features an **innovative heat exchanger** that captures heat from the module and transfers it to the system, effectively cooling the cells and further extending their lifespan. The SPRING4 is available in both insulated and ribbed versions, designed for use with **solar-water heat pumps**, making it the ideal solution for single-family and multi-family homes looking for a comprehensive heating and energy system. The panel also performs well in heating swimming pool water. Manufactured in France, it comes with a 10-year product warranty and a **30-year linear performance warranty**, and its design includes the possibility of recycling materials at the end of its lifespan. ## Notable figures - Efficiency of 21.8% matches the \*\*TOPCon 400-450W\*\* median - At 217.6 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - -0.31%/°C temperature coefficient - 0.02pp worse than \*\*TOPCon 400-450W\*\* median (-0.29%/°C), expect higher hot weather losses - At 34.5 kg (12.5 kg above \*\*TOPCon 400-450W\*\* median of 22.0 kg), requires checking roof load capacity - Ranked #7022 out of 14005 panels for efficiency in the database ## Questions ### How does the DualSun SPRING4 differ from a conventional photovoltaic panel? The DualSun SPRING4 is a hybrid PVT (photovoltaic-thermal) module that simultaneously generates electricity — like a standard PV panel — and recovers heat through a thermal exchanger integrated into the back of the module. As a result, you can obtain up to twice the total energy yield from the same roof area. Additionally, active cooling of the cells by the heat-transfer fluid improves their conversion efficiency and extends service life, neither of which a conventional PV panel provides. ### What variants does the SPRING4 series come in, and which one should I choose for a heat pump system? The SPRING4 is available in three versions: insulated (for domestic hot water heating), finned (designed to work with brine-to-water heat pumps as a renewable low-temperature heat source), and uninsulated (for regenerating ground-source geothermal borehole fields). For a brine-to-water heat pump installation, the finned variant is the optimal choice, as it is specifically engineered to operate with a glycol-based heat-transfer fluid. ### What warranty does DualSun offer on the SPRING4 panels? The manufacturer provides a 10-year product warranty covering material and workmanship defects. On the photovoltaic side, a 30-year linear power output warranty applies — after 30 years the panel is guaranteed to retain at least 87.4% of its original rated power. This represents one of the longest warranty periods currently available in the PVT panel market. ### Is the DualSun SPRING4 425 W suitable for swimming pool water heating? Yes, the DualSun SPRING4 is an excellent solution for swimming pool water heating. The heat exchanger integrated into the rear of the panel transfers the collected thermal energy to a circuit that can feed directly into a pool heat exchanger. This is a cost-effective approach, since the same panel simultaneously supplies electricity to the home and heats the pool water, eliminating the need to install separate solar thermal collectors. ### What cell technology does the DualSun SPRING4 use, and why does it matter? The SPRING4 uses N-Type TOPCon half-cut monocrystalline cells with an output of up to 425 Wp. TOPCon technology delivers higher efficiency than standard PERC cells and superior performance under low-irradiance conditions (overcast days, low sun angles). The N-Type cell architecture is characterized by lower long-term degradation and the absence of the LID (light-induced degradation) effect, resulting in more stable energy production throughout the entire 30-year operational lifetime. ### Where are DualSun SPRING4 panels manufactured, and does that affect quality? The SPRING4 is designed by DualSun engineers at the company's R&D center in Marseille and manufactured at the DualSun factory near Lyon, France. European origin translates to a shorter supply chain, compliance with stringent EU standards (EN ISO 9806 certification, RG3 hail resistance rating), and simpler warranty claim procedures. The manufacturer has also incorporated end-of-life material recyclability into the panel's design. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/dualsun-en-datasheet-spring4-425-topcon-insulated-b87d448a4cb6.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | 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, lighter, +2.0 pp | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, 15 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, 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, 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, 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, lighter, +2.7 pp | --- Source: https://comparepv.com/panel/dualsun-spring4-425-topcon-i Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.