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DualSun Brand review

SPRING4 425 TOPCon I

425 Wp TOPCon
ComparePV verdict

Middle of its segment, heavy for its output

Rank 10,741 of 14,005
Compare panels Datasheet PDF
Power (Wp)
425
Typical for its class
Efficiency (%)
21.80
Typical · median 22.00%
Density (Wp/m²)
217.6
Typical · median 220.2
Temp (%/°C)
-0.310
Weak · bottom 10%
Weight (kg)
34.5
Weak · 12.5 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 4 caution
Best for

Residential and shaded-installations.

Not ideal for

Weight-limited structures and hot climates.

Watch-outs
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.

What owners get
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.

Trade-offs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 425 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.80 % Typical Segment median 22.00%
Vmpp · Impp 33.75 V · 12.60 A Operating point at max power
Voc · Isc 39.35 V · 13.33 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1722×1134×71 mm · 1.95 m² of roof
Weight 34.5 kg Weak Weak · 12.5 kg above median
Cells 108 · TOPCon Monocrystalline
Coefficient Pmax -0.310 %/°C Weak bottom 10% of its segment
Coefficient Voc · Isc -0.260 · 0.038 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 10 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 371 W guaranteed

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.310 %/°C against a segment median of -0.290
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
DualSun SPRING4 425 TOPCon I 425 W 21.80% -0.310 34.5 kg You are here
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg Lighter, +2.2 pp, +10 yr warranty
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +40 W, lighter, +2.0 pp
JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg +50 W, 15 kg lighter, +2.0 pp
TWMNH-48HW475 475 W 23.80% -0.280 23.7 kg +50 W, lighter, +2.0 pp
CHSM48RN(DG)/F-BH-475 475 W 23.80% -0.290 24.5 kg +50 W, lighter, +2.0 pp
AIKO-A475-MCE54Mw 475 W 23.80% -0.260 21.0 kg +50 W, lighter, +2.0 pp
AIKO-A475-MAH54Mw 475 W 23.80% -0.260 21.5 kg +50 W, lighter, +2.0 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +85 W, lighter, +3.2 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +70 W, lighter, +3.0 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +80 W, lighter, +2.9 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +65 W, lighter, +2.7 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +75 W, lighter, +2.7 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +75 W, lighter, +2.7 pp

Found 1783 panels of the same or similar size to this one, within ±10 mm. See them here Found 1914 panels of the same or similar size to this one, within ±25 mm. See them here Found 3392 panels of the same or similar size to this one, within ±50 mm. See them here Found 3970 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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