Marine Battery Isolator Wiring Diagram: Understanding VSR and Its Installation

As a professional manufacturer of marine electrical and electronics products, YIS Marine has been dedicated to providing high-quality solutions for over 20 years. Our expertise in marine electrical products has served more than 200 customers worldwide with international safety standards. In this article, we will delve into the world of Voltage Sensitive Relays (VSR) and how they can be installed in a two-battery system.

What is VSR?

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VSR, also known as Automatic Charging Relay (ACR), is an automatically controlled relay switch that allows two batteries to be combined when charging and isolated when not charging. This innovative technology enables you to preserve the full power capacity of your start battery while keeping it fully charged at all times.

How Does VSR Work?

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When the engine is OFF, the voltage will drop, and the VSR will turn OFF by cutting the connection. This means that any loads would draw power only from the house battery, preserving the full power capacity in the start battery. Conversely, when the engine is ON, the sensing voltage would be high, and the VSR will turn ON and make the connection, allowing both start and house batteries to be charged.

Typical Wiring Diagram

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Below is a typical wiring diagram from a VSR in a two-battery system (start and house batteries). This diagram illustrates how you can automatically preserve a fully charged battery at all times, especially the start battery for starting the engine.

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In conclusion, VSR technology offers a convenient and efficient way to manage your marine electrical system. By understanding how VSR works and installing it correctly, you can ensure that your batteries are always fully charged, ready to provide power when needed. As a trusted manufacturer of marine electrical products, YIS Marine is committed to providing reliable solutions for your marine needs.

Marine battery isolator wiring diagram