Technical datasheet

SPRING4 425 TOPCon Non-insulated

The hybrid solar panel which produces electricity and boosts your hot water and heating production, coupled with a geothermal heat pump (glycoled water/water). The non-insulated model of the SPRING 4 can be used to recharge geothermal probes.

Up to 30% more efficiency for your geothermal heat pump

Aesthetic thanks to the black aluminum frame.
  • A 2-in-1 innovation A combination of photovoltaic and thermal solar energy that produces at least 2 times more energy than a conventional photovoltaic panel.
  • Made in France label SPRING technology is designed by DualSun’s engineering teams at the R&D center in Marseille, and manufactured at the DualSun plant near Lyon.
  • Low carbon The panel for reducing buildings’ carbon footprint, it is designed with high-quality components and follows manufacturing processes that limit CO2 emissions.


  • IEC 61215 – 61730 : PV 60174698 0001
  • IEC 61701 : PENDING
  • IEC 62716 : PENDING
  • Solar Keymark : 011-7S3218 P

Efficiency & Performance

Front side – Electricity production

✔ N-type TOPCon monocrystalline cells

✔ Minimum guaranteed exceptional efficiency of 21.8% and performance warranty of 87.4% at 30 years

Back side – Hot water production

✔ Patented metal heat exchanger, highly resistant to pressure

✔ Generates solar heat in the summer as well as in the winter, providing dual-solar energy production



✔ 10-year product warranty starting from activation of warranty. See more about warranty activation conditions


✔ 30-year linear performance warranty for photovoltaic production


  • Compatible with heat pump heating
  • Compatible with geothermal probes
  • Compatible with a wide range of installation systems

Technical Data

  • DSTN425-108M10TB-03
  • Publication 22 March 2024
  • Updated 14 May 2024
  • V 1.0
  • Base SPRING4 NI

Physical characteristics

  • Length 1722 mm
  • Width 1134 mm
  • Thickness 71 mm
  • Weight 33.7 kg
  • Max Positive Mechanical Load 5400 Pa
  • Max Negative Mechanical Load 2400 Pa
  • Hail Resistance RG3
  • Cell technology TOPCon
  • Cell Architecture Half-cut
  • Cell quantity 108
  • Cable Length 1400/1400 mm
  • Rear Side Color Black
  • Front Side Color Black

Photovoltaic characteristics

  • Nominal power 425 W
  • Power Tolerance -/+5Wc
  • Rated Voltage (Vmpp) at STC 32.21 V
  • Current at Maximum Power Point (Impp) at STC 13.2 A
  • Maximum System Voltage 1500 V
  • Open Circuit Voltage (Vco) at STC 38.58 V
  • Short Circuit Current (Isc) at STC 13.83 A
  • Voltage temperature coefficient (μIsc) -0.26 %/°C
  • Current temperature coefficient (μIsc) 0.038 %/°C
  • Power temperature coefficient (μPmpp) -0.31 %/°C
  • Temperature -40°C / +85°C
  • NMOT 45°C +/-2
  • Application Class 2
  • Product Warranty 25 years
  • Performance Warranty – 30 Years 87.4 %

Thermal characteristics

  • Filled Weight 38.8 kg
  • Surface Area 1.95 m²
  • Liquid Volume 4.9 L
  • Maximum Service Pressure 6 Bar
  • Pressure Drop 60L/h Portrait 0.006 kPa
  • Pressure Drop 100L/h Portrait 0.018 kPa
  • Stagnation Temperature 70 °C
  • Thermal Loss Coefficient (A1) 20.3 W/K/m²
  • Thermal Power 482 W/m²
  • Thermal Power 939.9 W/pn

Values calculated according to SolarKeymark standard: P =1000W/m², T=25°C, u=1.3m/s

Technical drawing & graphs

DualSun’s commitment to the energy transition

Our mission at DualSun is to reduce the carbon emissions and environmental impact of our buildings with high-performance, durable solar panels.

To achieve that mission, DualSun is guided by 3 core values: 

  • To continuously innovate in the ecodesign of our solar panels: by developing manufacturing solutions that reduce carbon emission and environmental impact
  • To actively contribute to the development of the solar industry: by offering solar training programs, participating in solar lobby efforts and especially through building a network of local and reliable installers
  • To present a unique and unmatched experience for our customers: by guiding our customers from A to Z in their solar projects from simulation to installation and beyond. 
Les engagements DualSun