Polycrystalline Solar Panels

Los paneles solares policristalinos son módulos fiables y económicos, muy usados en sistemas 12V/24V y formatos compactos. Ideales para caravanas, náutica, señalización, telecom y pequeñas instalaciones aisladas donde prima la robustez y el precio por W.

Elígelos cuando necesites módulos de pequeño tamaño, tensión nominal 12/24V para reguladores PWM/MPPT, y una solución duradera con buena relación coste-rendimiento. Ofrecen marcos de aluminio y vidrio templado para una larga vida útil en exterior.

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What is a polycrystalline solar panel?

A polycrystalline panel is made up of silicon cells with multiple crystals. It is characterized by its robustness, availability in 12V/24V nominal voltages, and compact formats, making it perfect for small off-grid installations, vehicles, and applications where space and battery bank voltage determine the design.

Advantages

  • Excellent cost per W ratio for small and medium-scale projects.
  • Wide availability in small sizes for integration in caravans, boats, and cabins.
  • Direct compatibility with PWM and MPPT controllers at 12/24V.
  • Durable construction: aluminum frame, tempered glass, and sealed junction box.

Limitations

  • Lower efficiency per m² compared to monocrystalline panels.
  • On roofs with limited space, it may be advisable to switch to mono or bifacial for more Wp per m².

Recommended applications

  • Isolated 12V/24V systems: lighting, small pumping, cameras, IoT/telecom.
  • Motorhomes and marine: charging service batteries with PWM/MPPT controller.
  • Signaling and beacons, site cabins, and shelters.

How to choose your polycrystalline panel

  • Nominal voltage: 12V (Vmp≈18V) or 24V (Vmp≈36V) according to your controller and bank.
  • Power and dimensions: adjust the size to the available space and structure.
  • Electrical parameters: check Voc, Vmp, Isc, and Imp to ensure the MPPT window and the controller's current limit.
  • Environment: choose the protection grade of the frame/junction box for marine or dusty environments.

Typical specifications (indicative)

Technology Polycrystalline
Nominal voltage 12V or 24V (depending on cell configuration)
Power range ~20–350 Wp (compact and medium formats)
Voc / Vmp ~22/18V (12V) · ~44/36V (24V) — see each model's datasheet
Isc / Imp According to power; check with the controller and wiring
Construction Tempered glass, anodized aluminum frame, IP65/67 box
Warranties Product and linear power (check with manufacturer)

Exact values vary by model; size strings by Voc at minimum temperature and check controller limits.

Best practices

  • Use MPPT controllers to improve performance, especially with long wiring or low temperatures.
  • Protect the PV circuit with fuses/fuse holders and DC SPD where appropriate.
  • Ensure rear ventilation, certified mounting, and correct torque on clamps.
  • If there are frequent partial shadows, consider optimizers on the affected modules.

Comparisons and related collections

Polycrystalline solar panels are the practical and robust option for 12/24V systems and compact formats, with an optimal balance between price, durability, and ease of integration.

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