Battery separator relays

The battery separator relays are key components in electrical systems that include multiple batteries. They allow efficient and safe charging without the risk of discharging between batteries. They are perfect for photovoltaic systems, recreational vehicles, boats, campers, caravans and power backup systems.

Battery separator relay

Battery separator relays are key components in installations that include multiple batteries, allowing efficient and safe charging without the risk of any discharge between batteries. They are ideal for photovoltaic systems, recreational vehicles (RVs), boats, camper vans, caravans and power backup systems.

What is a battery separator relay for?

When a system has two or more batteries, as in the case of a starter battery and an auxiliary battery, it is essential to prevent the main battery from being discharged by the use of devices that are connected to the secondary battery. A separator relay is responsible for connecting both batteries only when the main battery has reached the desired charge level, thus ensuring that it is not accidentally drained.

Advantages of a battery separator relay

  • Prevent discharge of the main battery: Protect the starter battery, the vehicle's main battery, or the solar system.
  • Full automation: No manual intervention is required, which improves the efficiency of the system.
  • Optimisation of energy use: Ensure that both batteries are charged properly and in a balanced way.
  • Compatibility with photovoltaic and mobile systems: Battery separator relays are perfect for a wide variety of applications, from solar installations to electrical systems on boats, motorhomes or off-road vehicles.
  • Easy installation: Many models include plug & play systems for simple connection.

How to choose a battery separator relay

In order to choose the battery separator relay we need for our installation we have to take into account these aspects:

  • System voltage: The first thing to do is to make sure that the relay is compatible with your 12V, 24V or 48V system.
  • Current capacity: You should choose a model with sufficient amperage to support the charge of your batteries.
  • Relay type: Depending on your installation, an electromechanical relay, a VSR relay or a bi-directional model may be more suitable.
  • Protection and durability: Choose relays with overload protection and materials resistant to harsh environments (especially on boats or off-road vehicles).

Types of Battery Separator Relays

There are different types of separator relays depending on their technology and operation:

  • Electromechanical relay: They use a mechanical switch to connect or disconnect the batteries. They are inexpensive and robust, but can wear out over time.
  • Electronic Relay (VSR - Voltage Sensing Relay): Automatically detects the battery voltage and manages the connection more efficiently. They are more advanced and offer greater durability.
  • Bi-directional protection relay: Allows charging in both directions, ensuring that both the primary and secondary batteries can receive power when they need it.