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Morningstar RD-1 > Relay Driver for Tristar Controller

Morningstar RD-1 - Relay Driver for Tristar Controller

Our Price: $149.00


Description Datasheet

Morningstar Relay Driver

Manufacturer Part Number: RD-1

Morningstar’s Relay Driver (RD-1) is a logic module which provides high level system control functions such as high/low voltage alarms, load control and generator start. The product controls four independent relay driver outputs by reading digital data inputs from Morningstar’s TriStar controller or by reading battery voltage when used in systems with other controllers.


  • Logic module for high level system control
  • Use with Tristar or other systems
  • Provides voltage alarm, load control and generator start
  • Cost effective
  • High reliability
  • Fully programmable
  • Advanced generator control
  • Industrial design
  • LED indicators


System Voltage 12 to 48 Volts
Max. Channel Current 750 mA
Accuracy Voltage 2% +/- 50 mV
Temperature +/- 2°C
Min. Operating Voltage 8 Volts
Max. Operating Voltage 68 Volts
Self-consumption < 20 mA
Temperature Sensor Range –40°C to +85°C
Transient Surge Protection 1500 W / channel

Detailed Description

Connected to a TriStar Controller

Battery voltage, charge/load current, battery temperature, TriStar heatsink temperature, PWM duty cycle, PV/load voltage, and all TriStar alarms or faults.

Used in Systems with Other Controllers

Battery voltage, Relay Driver temperature, input voltages from other sources.

Cost Effective

The four channels provide up to four high level system control functions at a lower cost compared to other alarm and generator start packages.

High Reliability

Each channel has complete electronic protections for high reliability.


The system designer may choose the exact relay needed for each application including a wide range of current ratings and solid state, mechanical or mercury displacement relays.

Fully Programmable

It is easy to program the Relay Driver with the included PC software via serial RS-232 port connection. Data is stored in non-volatile memory. The Relay Driver is pre-programmed with four commonly used settings.

Advanced Generator Control

Provides flexible parameters to control one, two or three-wire generator schemes and complete control of preheat, crank, ignition and cool-down.

Industrial Design

Each relay driver output may be controlled directly by MODBUS commands via the RS-232 for use with PLC’s and other industrial hardware. Mounts to a DIN rail or a flat surface.

LED Indicators

Displays power and status of each channel as well as faults and data sampling intervals.

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