Steca Solarix PRS 3030 PWM Solar Charge Controller 30A 12V/24V

The Solarix PRS 3030 from Steca (MPN: PRS 3030) is a PWM solar charge controller for 12V and 24V lead-acid battery systems with a maximum charge and load current of 30A. It reliably regulates the charging process between the solar module and the battery, protects the energy storage system from harmful operating conditions, and controls connected DC loads via an integrated load output. Thanks to its automatic system voltage detection, the charge controller is suitable for both small and medium-sized off-grid systems in recreational, camping, and stationary applications.

Product Highlights

• PWM solar charge controller for 12V and 24V lead-acid battery systems
• Maximum charge and load current: 30A
• Automatic detection of battery system voltage
• Integrated load output with deep-discharge protection
• Multi-stage battery charging process for gentle charging
• LED indicators for charge level, battery condition, and operating status
• Temperature compensation to adjust the charging voltage
• Comprehensive electronic protection functions
• Low-maintenance operation with no moving parts

Efficient PWM charging technology

The Solarix PRS 3030 operates using the PWM (Pulse Width Modulation) method. In this process, the charging current is regulated based on the battery’s state of charge. This method is particularly well-suited for traditional 12V and 24V solar systems where the module voltage matches the battery voltage. The multi-stage charging curve—featuring charge, boost, float, and equalization modes—ensures gentle battery charging and helps extend battery life. The integrated temperature compensation automatically adjusts the charging voltage to the ambient temperature.

Protection of the Battery and Connected Loads

The charge controller continuously monitors the battery’s state of charge and protects it from overcharging and harmful deep discharge. If the battery voltage drops below the permissible range, the integrated load output automatically disconnects connected loads from the battery. As soon as sufficient energy is available again, these loads are automatically reconnected. This helps extend the battery’s service life—particularly in off-grid solar systems—and prevents complete discharge.

It also features numerous electronic protection functions:

• Overcharge protection
• Deep-discharge protection
• Battery undervoltage protection
• Reverse current protection for the solar module
• Short-circuit protection at the load output
• Overtemperature protection
• Overvoltage protection at the load output
• Protection against reverse polarity of the battery
• Protection against incorrect connection sequence
• Protection against excessive load current

Clear LED status display

Operation is managed entirely via clearly visible LED indicators. An info LED indicates the operating status, while additional LEDs display the battery’s charge level and ongoing charging processes. Warning and error conditions—such as low battery voltage or an active deep-discharge protection function—are also displayed directly, allowing the system’s status to be quickly checked at any time.

Typical Applications

• Off-grid solar systems
• Garden sheds
• Weekend homes
• RV and campers
• Boats
• Off-Grid Power Supplies
• Lighting systems
• Surveillance and Communication Technology
• Small Off-Grid Power Systems

Installation

The controller is installed between the solar module, the battery, and optional DC loads. To ensure safe operation, the manufacturer recommends installing it in a dry indoor location on a non-flammable surface with adequate ventilation. The connection sequence must be followed: First connect the battery, then the solar module, and finally the loads. For the 30A controller, a conductor cross-section of 16 mm² is recommended for the specified cable lengths. An external battery fuse must also be provided.

Technical Specifications

• Battery systems: 12V / 24V (automatic detection)
• Max. charging current: 30A
• Max. load current: 30A
• Max. short-circuit current, solar module: 30A
• Max. module voltage: 47V DC
• 12V system:
  • Float charge: 13.9V
  • Boost charging: 14.4V
  • Equalization charge: 14.7 V
• 24V system:
  • Float charge: 27.8 V
  • Boost charge: 28.8 V
  • Equalization charge: 29.4 V
• Connection cross-section: up to 16 mm²
• Protection class: IP32
• Permissible ambient temperature: -25°C to +50°C
• Temperature compensation: -4 mV/K/cell
• Weight: 345 g
• Dimensions: 187 × 96 × 45 mm

Package Contents

1x Steca Solarix PRS 3030 PWM solar charge controller
1x Installation and Operating Instructions

Note
The battery type can only be changed using an optional accessory (Steca PA RC100).
The Steca PRS series is factory-set for lead-acid (flooded) batteries.