Load Control with a Relay

Load Control With A Relay

Load Control for Large, Inductive, or Capacitive Loads

Abstract:

Some loads are not suitable for direct connection to the Load terminals of a Morningstar

controller. Heavily inductive or capacitive loads such as pumps, motors, compressors, and

inverters should not be wired to the controller’s Load terminals. In addition, loads exceeding

the Load Current Rating of the controller should not be connected to the controller’s Load

terminals. Low Voltage Disconnect protection can be maintained when using these loads via

the use of a Relay. A diagram and corresponding notes shows how this can be accomplished.

v01

Technical Documentation

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Te c h n i c a l D o c u m e n t a t i o n Load Control With A Relay Load Control for Large, Inductive, or Capacitive Loads v01 Abstract: Some loads are not suitable for direct connection to the Load terminals of a Morningstar controller. Heavily inductive or capacitive loads such as pumps, motors, compressors, and inverters should not be wired to the controller’s Load terminals.
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Charge Controller PV Array + - Array + Flyback Diode Battery - Battery + Load + Load - Array - N/O Relay -> LOAD + - 12 Volt IMPORTANT: This is not intended to be a complete system diagram; fusing, disconnects, and grounding should comply with local electric codes. Notes: • Used when the load is an inverter, pump, motor, compressor, or exceeds the controller’s Load current rating. • The Flyback Diode is recommended to clamp inductive voltage spikes when the Relay is de-energized.