Technical Articles

What is a LVD relay?


A Low Voltage Disconnect (LVD) relay, also known as a battery protection relay, is an electrical device commonly used in various applications to prevent batteries from being over-discharged. It acts as a safeguard that disconnects the load from the battery when the voltage drops below a certain threshold, thereby preserving the battery's lifespan and preventing potential damage.

How does it work?

The LVD relay works by continuously monitoring the battery voltage. When the voltage falls below a predetermined threshold, typically around 10.5 volts, the relay triggers and opens the circuit, isolating the load from the battery. This prevents any further discharge and protects the battery from becoming completely drained, which could lead to permanent damage.


LVD relays find application in a wide range of sectors where batteries are used to power different devices. Some common applications include:

Automotive: LVD relays are used in automobiles to protect the battery from going flat and ensure there is enough power to start the engine.

Solar Power Systems: LVD relays are essential components in solar power systems to protect the batteries from being over-discharged during periods of low sunlight or heavy loads.

Marine/RV: LVD relays are employed in boats and recreational vehicles to prevent deep discharge of batteries and ensure they have sufficient power for critical functions.

Emergency Lighting: LVD relays are used in emergency lighting systems to maintain adequate battery charge and ensure the lights remain functional during power outages.


LVD relays play a crucial role in protecting batteries against over-discharge, prolonging their lifespan, and ensuring reliable operation of various systems. By monitoring the battery's voltage and disconnecting the load when necessary, LVD relays provide an effective solution for maintaining battery health. With their diverse applications in automotive, solar power, marine/RV, and emergency lighting industries, LVD relays have become an integral part of modern electrical systems.



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