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Solar charge controllers

Solar charge controllers are a crucial part of any onboard solar energy system. They regulate the power generated by solar panels and ensure that batteries are charged safely, efficiently and correctly. Without a charge controller, batteries can be damaged by overcharging or inefficient charging.

Keep your solar system efficient with solar charge controllers from Victron. Choose from PWM and MPPT controllers, with MPPT offering higher efficiency and real-time tracking of solar input for optimal charging even in variable light source. Perfect for use with AGM, Gel, and Lithium batteries, Victron controllers ensure smart, safe, and reliable solar power management onboard.

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Why are solar charge controllers important on a boat?

A solar charge controller sits between the solar panels and the batteries. It controls voltage and current to ensure batteries are charged at the correct rate and protected against overcharging, deep discharge and electrical damage.

They are essential because they:

  • Protect batteries from damage
  • Improve charging efficiency
  • Extend battery lifespan
  • Ensure stable and reliable solar power

Especially on boats, where batteries are critical, a proper controller is indispensable.

What is the difference between PWM and MPPT charge controllers?

PWM (Pulse Width Modulation)

  • Simpler technology
  • Lower cost
  • Best suited for small systems
  • Panel voltage closely matches battery voltage
  • Lower efficiency, especially in cooler or variable conditions

MPPT (Maximum Power Point Tracking)

  • Advanced technology
  • Higher efficiency (often 20–30% more yield)
  • Optimises power output regardless of panel voltage
  • Ideal for larger systems and marine installations
  • Better performance in changing light conditions

For most marine solar systems, MPPT controllers are recommended.

Which Victron solar charge controllers are available?

Victron SmartSolar MPPT

  • MPPT technology for maximum efficiency
  • Built-in Bluetooth for monitoring and configuration
  • Suitable for AGM, Gel, Lithium and Lead-acid batteries
  • Widely used in marine installations

Victron BlueSolar MPPT

  • MPPT technology without built-in Bluetooth
  • Reliable and robust design
  • Ideal for fixed installations with external monitoring

Victron PWM Controllers

  • Cost-effective solution for small solar systems
  • Simple and reliable
  • Suitable for basic battery maintenance

How do I choose the right solar charge controller?

Consider:

  • Total solar panel wattage
  • Battery voltage (12V / 24V)
  • Battery type
  • Available monitoring needs
  • Installation space

Correct sizing ensures safety and optimal energy yield.

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