• Metered Version

  • Non-Metered Version


The ProStar solar charge controller has been the leading mid-range pulse width modulation (PWM) controller since 1995. With over 350,000 units installed in the harshest environments in over 100 countries, ProStar sets the standards in performance and reliability for the rest of the solar industry.

The Generation 3 ProStar shares the outstanding build quality and familiar form factor of its predecessors and adds data and lighting control capabilities, a graphical interface, and advanced protection features that meet the needs of today’s most demanding off-grid solar applications. ProStar provides both “the legend and the latest” in a single new product.

“…you get what you pay for, and this one is worth every penny…count on Morningstar.”

Key features and benefits

  • High Reliability
    Latest electronic and environmental protections, quality control,
    and design considerations comply with IEC 62109 and promote
    longevity in the harshest environments
  • High Temperature Operation
    Full nameplate current rating, both solar and load up to 60°C
  • Auto-Battery-Select
    12V and 24V systems
  • Data Logging
    Up to 256 days of solar charge and load consumption data 
  • Self-diagnostics
    Continuous monitoring and reporting of any errors or system
    faults through its status LED’s, optional display and
    communication port
  • Meter
    High resolution LCD, multi-lingual backlit graphical display of system voltage, current, temperature, lighting settings, etc.
  • Custom Programming
    Dip switches, meter interface, or connection with a computer can be
    used to adjust charging, load communications, and lighting control
  • Low Noise Design
    Meets US Federal Communications Commission Class B specifications
  • Automatic Solar-Based Lighting Control
    Field adjustable, multi-event load control enables powerful options for
    solar lighting systems
  • MODBUS Communications
    Open standard MODBUS communications protocol allows for control
    and remote data access
  • SNMP (Simple Network Management Protocol) Monitoring
    Provides more detailed monitoring of all system data with existing IT
    management and architecture when connected to EMC-1 accessory
A. Premium high-frequency CoilCraft surface mount inductors

They’re worth it, because they provide the faster power “tracking” that lets us engineer this much power and control into a compact design.

B. High-frequency design

Combined with premium, “over-spec’d” components, this greatly improves control response which guards against system transients, regulation overshoot and overcurrent/overload conditions

C. Built-in 4500W Transient Voltage Surge Suppression for lightning protection

Nature do your worst–this controller can take it

D. Large diameter, high torque, corrosion resistant terminals

If you’ve ever trashed a lesser terminal during an installation, you’ll appreciate some “overkill” here

E. DirectFET™ MOSFET power devices

Allows the surface-mounting of critical components underneath the main board next to the heat sink, which reduces heat travel distance and keeps the controller even cooler

F. Highly-conductive aluminum heatsink extrusion

As opposed to cast aluminum, which is less effective in passive cooling applications

G. Communications/data port with serial/meter auto detect

“Talks solar” with standard industry language, for system monitoring and cloud connectivity-speaks Modbus, and SNMP (with the EMC-1)

H. Lithium foldback circuit

Lithium batteries are expensive and vulnerable to cold temperatures. When it gets close to freezing, the controller backs-off charging to avoid damaging batteries

I. High-speed ARM processor

All-digital calibration for high accuracy, using the same efficient technology found in advanced mobile device

J. TrakStar™ Technology

Morningstar’s hallmark MPPT technology precisely seeks and locks onto the true maximum power point quickly and accurately, to ensure the highest output possible from a solar array

K. Large format, high-resolution backlit LCD

When you’ve been in the field installing, you appreciated being able to read a crisp, high contrast display on site

L. 5 year warranty

Up to 2 1/2 times longer than some competitors in this class

M. Self-diagnostics

ProStar is smart enough to monitor and analyze system performance, and alert you when you need to know

N. High temperature architecture

Heat is the enemy of all electronics. That’s why Prostar’s critical components are rated to withstand temperatures right up to the boiling point of water (100°C)

O. Lexan polycarbonate UL listed case

Protects the precision electronics inside with an impact strength 30 times greater than the acrylic thermoplastics commonly found on lesser controllers

P. Cooling Fan

Just kidding. We’ve never needed them

Specifications and Certifications

Model PS-15 PS-15M PS-30 PS-30M
Charge Rating 15 amps 15 amps 30 amps 30 amps
Max. PV Open Circuit Voltage (Voc) 60 volts 60 volts 60 volts 60 volts
Nominal Battery Voltage 12V or 24V 12V or 24V 12V or 24V 12V or 24V
Battery Voltage Range 10-35V 10-35V 10-35V 10-35V
Voltage Accuracy <=0.1% +/- 50mV <=0.1% +/- 50mV <=0.1% +/- 50mV <=0.1% +/- 50mV
Operating Temperature Range -40 C to +60C -40 C to +60C -40 C to +60C -40 C to +60C
Warranty 5 Years 5 Years 5 Years 5 Years
Built-in meter Yes Yes
CE and RoHS compliant Yes Yes Yes Yes
IEC 62109 Yes Yes Yes Yes
ETL Listed [UL-1741 and Canadian CSA C22.2 No.107.1.01] Yes Yes Yes Yes
FCC Class B Part 15 Compliant Yes Yes Yes Yes
Manufactured in a Certified ISO 9001 Facility Yes Yes Yes Yes

Operation Manuals


ProStar (Gen3) Controller - 3 minute video

This short video highlights the ProStar (Gen3) PWM solar charge controller. This device has been upgraded, while maintaining the same quality and form factor of previous models that have been installed in over 100 countries in the world’s harshest environments since 1995. View this video to learn about the new features and capabilities of this product including enhanced custom programming, data logging, communications, and lighting control.

ProStar (Gen3) Solar Charge Controller Presentation

Recorded Webinar

This presentation provides a more in depth overview the ProStar (Gen3) PWM solar charge controller.  You’ll see a comparison between the Gen3 and earlier ProStar models concerning meter displays, self-diagnostics, load/lighting control, communications, data logging, certifications, and other features.


  • Lighting
  • Mobile (RV, Boating)
  • Railroad
  • Rural Electrification
  • Residential
  • Security
  • Transportation
  • Traffic


  • Ethernet MeterBus Converter

    enables IP-based networking and internet connectivity for select Morningstar products

  • Ground Fault Protection Device

    prevents current from following any unintended paths during a ground fault

  • Remote Temperature Sensor

    recommended when temperature at the battery and controller differs more than 5°C

  • Relay Driver

    programs conditional generator start/stop, high/low voltage alarms, load control and more

  • MeterHub

    enables up to 15 Morningstar products on a single MeterBus network

  • Remote Meter

    provides voltage, current and temperature readings up to 10 meters away from system

  • PC MeterBus Adapter

    converts a controller's RJ-11 meter port to a RS-232 serial connector for connection to a PC

  • USB MeterBus Adapter

    converts RJ-11 interface to USB 2.0 interface to allow MS product to communicate with a PC


It’s a recommended best practice to install your product’s latest firmware to ensure access to all up-to-date features, accessory compatibilities, and code modifications. Watch this 5 minute video for instructions on how to download and update ProStar MPPT firmware.

After watching the video, click here to download the firmware.

System Diagrams

    Off-Grid Diagram with DC Load

The schematic diagram above, illustrates how the ProStar MPPT regulates power to batteries and a direct current (DC) load in an off-grid system.

  1. Sunlight contacts the solar modules, which convert solar into DC electrical power that it delivers to a charge controller.
  2. The charge controller regulates the amperage and voltage that is delivered to the loads and any excess power is delivered to the battery system so the batteries maintain their state of charge without getting overcharged.
  3. During the evening when there is no sunlight, battery power is used to run the load.



    Off-Grid Diagram with AC Load

The schematic diagram above, illustrates how the ProStar MPPT regulates power to batteries and an alternating current (AC) load in an off-grid system.  This diagram is very similar to the DC load diagram above it except an inverter has been added.

  1. Sunlight contacts the solar modules, which convert solar into DC electrical power that it delivers to a charge controller.
  2. The charge controller regulates the amperage and voltage that is delivered to the battery system so the batteries maintain their state of charge without getting overcharged.
  3. Batteries deliver power to the inverter which converts DC to AC power that it delivers to the load.  Notice that  the inverter is connected to the battery, not the controller’s load terminals, like we did in the DC load example.  That’s because the inverter can have a high energy surge upon start up, and this high current surge might be higher than the rated capacity of the charge controller, whereas the batteries will be able to meet the high energy surge requirement.