Understanding the
Wiring Diagram for Voltage Sensitive Relay
is crucial for anyone looking to build a robust dual battery system for their vehicle, RV, boat, or any application requiring independent power sources. A voltage-sensitive relay, often abbreviated as VSR, acts as an intelligent automatic switch that connects and disconnects auxiliary batteries based on the voltage of the primary charging system. This article will demystify the wiring diagram and its practical applications.
What is a Wiring Diagram for Voltage Sensitive Relay and How is it Used?
A
Wiring Diagram for Voltage Sensitive Relay
is a visual representation that illustrates how to connect a voltage-sensitive relay into a power system. Its primary purpose is to allow a secondary battery to charge from the primary charging source (like your alternator) only when the primary battery is sufficiently charged, and to isolate the secondary battery when the primary battery voltage drops below a certain threshold. This prevents the auxiliary battery from draining the starting battery, ensuring you can always start your vehicle.
These relays are invaluable for several reasons:
-
Battery Protection:
They safeguard your starting battery from being depleted by accessories powered by the auxiliary battery.
-
Efficient Charging:
They ensure that your auxiliary battery receives a charge only when the alternator is actively providing power, maximizing charging efficiency.
-
System Flexibility:
They allow for the integration of additional power storage without complex manual switching.
The basic principle of operation is straightforward. When the voltage from the alternator reaches a predetermined level (typically around 13.2-13.7 volts), the VSR activates, connecting the two batteries. When the engine is turned off and the voltage drops below a certain point (usually around 12.7-13.0 volts), the VSR disconnects the batteries. This simple yet effective mechanism is fundamental to many auxiliary power setups.
Here's a simplified table illustrating the VSR's core functionality:
|
Alternator Voltage
|
VSR Status
|
Battery Connection
|
|
Above 13.2V
|
Engaged
|
Connected
|
|
Below 12.7V
|
Disengaged
|
Disconnected
|
The implementation of a
Wiring Diagram for Voltage Sensitive Relay
typically involves connecting the relay's terminals to the positive terminals of both the starting battery and the auxiliary battery, with appropriate fusing for safety. Some diagrams may also show connections for a manual override switch or indicator lights.
Now that you have a foundational understanding of what a
Wiring Diagram for Voltage Sensitive Relay
entails, it's time to explore a practical example. Refer to the comprehensive guide provided in the subsequent section for a detailed, step-by-step walkthrough of how to wire your voltage-sensitive relay correctly.