Selecting a suitable Low Voltage Disconnect (LVD)

Selecting a suitable Low Voltage Disconnect (LVD)

When selecting a low voltage disconnect (LVD) for a battery-powered application, there are several factors to consider. Some of the most important considerations include:


Low Voltage Disconnect (LVD)


  1. Voltage threshold: The voltage threshold is the level at which the LVD will disconnect the load from the battery. It is important to choose an LVD with a voltage threshold that is appropriate for the battery and the equipment being powered. The voltage threshold should be set to a level that is safe for the battery and will not cause damage to the equipment.
  2. Low Voltage Disconnect Hysteresis Set-Point: Hysteresis is the difference between the voltage level at which the LVD disconnects the load and the level at which it will automatically reconnect the load to the battery. A higher hysteresis value can help prevent the battery from cycling on and off repeatedly, which can reduce the battery life.
    Example of LVD Actuation Voltages
  3. Load capacity: The load capacity is the amount of current that can safely pass through the LVD. It is important to choose an LVD with a load capacity that is appropriate for the equipment being powered. The load capacity should be higher than the maximum current draw of the equipment.
  4. Type of disconnect: LVDs can use different types of disconnects, such as electronic or mechanical, to disconnect the load from the battery. Electronic LVDs are more precise and have more features but may be more expensive than mechanical LVDs. These are available in 12, 24 and 48V DC operations.
  5. Operating temperature range: The operating temperature range is the range of temperatures in which the LVD can operate reliably. It is important to select an LVD that can operate within the temperature range of the environment in which it will be used.
  6. Response time: The response time is the time it takes for the LVD to disconnect the load from the power source after the voltage drops below the threshold. A fast response time is important to protect the load from damage.
  7. Power consumption: The power consumption is the amount of power that the LVD consumes when it is in operation. Low power consumption is important to minimize energy waste.
  8. Protection features: Some LVDs may have additional protection features, such as over-current protection, over-voltage protection, and short-circuit protection, to protect the load from damage.
  9. Response time: The response time is the time it takes for the LVD to disconnect the load from the power source after the voltage drops below the threshold. A fast response time is important to protect the load from damage.

Overall, choosing the right LVD for a battery-powered application is important to ensure the safety of the battery and the equipment being powered. By considering the factors listed above, it is possible to select an LVD that will provide reliable performance and protection for the battery and equipment.

For your customized power solution contact an Rfwel Power Solutions specialist here.

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