Prostar MPPT™ solar charge controller is an advanced maximum power point tracking (MPPT) battery charger for off-grid photovoltaic (PV) systems up to 1100 watts. All versions include load control and TrakStar™ Technology to maximize PV efficiency and energy harvest.
The ProStar design has been proven in over two decades of use in the world’s most demanding installations—and ProStar today reflects Morningstar’s policy of continuous improvement through regular upgrades and enhancements. Because Morningstar’s employee-owned culture never “rests on success,” ProStar customers can own both a legend and the latest in a single product.
“Best of the best. Have used and seen many others. This is the most durable…”
Watch the video to see what makes ProStar MPPT different from the inside out.
They’re worth it, because they provide the faster power “tracking” that lets us engineer this much power and control into a compact design.
Combined with premium, “over-spec’d” components, this greatly improves control response which guards against system transients, regulation overshoot and overcurrent/overload conditions
Nature do your worst–this controller can take it
If you’ve ever trashed a lesser terminal during an installation, you’ll appreciate some “overkill” here
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
As opposed to cast aluminum, which is less effective in passive cooling applications
“Talks solar” with standard industry language, for system monitoring and cloud connectivity-speaks Modbus, and SNMP (with the EMC-1)
Lithium batteries are expensive and vulnerable to cold temperatures. When it gets close to freezing, the controller backs-off charging to avoid damaging batteries
All-digital calibration for high accuracy, using the same efficient technology found in advanced mobile device
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
When you’ve been in the field installing, you appreciated being able to read a crisp, high contrast display on site
Up to 2 1/2 times longer than some competitors in this class
ProStar is smart enough to monitor and analyze system performance, and alert you when you need to know
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)
Protects the precision electronics inside with an impact strength 30 times greater than the acrylic thermoplastics commonly found on lesser controllers
Just kidding. We’ve never needed them
|*Input power can exceed Nominal Operating Power. Controller will limit and provide its rated continuous maximum output current into batteries.|
|Charge Rating||25 amps||25 amps||40 amps||40 amps|
|Max. PV Open Circuit Voltage (Voc)||120 volts||120 volts||120 volts||120 volts|
|Nominal Battery Voltage||12V or 24V||12V or 24V||12V or 24V||12V or 24V|
|Nominal max. Operating Power* - 12 volt battery||350W @45C||350W @45C||550W @45C||550W @45C|
|Nominal max. Operating Power* - 24 volt battery||700W @60C||700W @60C||1100W @60C||1100W @60C|
|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|
|CE and RoHS compliant||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|
This 5 minute video highlights the ProStar MPPT solar charge controller’s circuit board that differentiates it from other brands. In addition to the capacitors, inductors, processors, surge protectors, and other over-spec’d internal components, the quality of the controller’s heat sink and outer casing is also addressed. The video concludes with mention of features and capabilities related to communications, datalogging, lithium battery charging, and high quality and reliability.
converts RS-232 to EIA-485 so up to 128 MS products can communicate on the same bus
enables IP-based networking and internet connectivity for select Morningstar products
prevents current from following any unintended paths during a ground fault
enables up to 15 Morningstar products on a single MeterBus network
programs conditional generator start/stop, high/low voltage alarms, load control and more
provides voltage, current and temperature readings up to 10 meters away from system
recommended when temperature at the battery and controller differs more than 5°C
converts RJ-11 interface to USB 2.0 interface to allow MS product to communicate with a PC
optional cover for large wires and conduit leading to and from the ProStar MPPT controller
converts a controller's RJ-11 meter port to a RS-232 serial connector for connection to 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 and go to the software tab to access and download the firmware.
The schematic diagram above, illustrates how the ProStar MPPT regulates power to batteries and a direct current (DC) load in an off-grid system.
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.