Missouri Wind and Solar

Battery Guard Low Voltage Protection Switch

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  • Battery Guard Low Voltage Protection Switch
  • Battery Guard Low Voltage Protection Switch
$119.99 - $125.99


100 Amp Automatic Low Voltage Shutdown Relay Switch

For Lithium, Lead Acid and Sealed AGM Batteries

Automatic Battery Disconnect Switch

Protect your batteries from being over-discharged

Use our Low Voltage Battery Protection Relay Switch to temporarily disconnect your power inverter or other DC devices from your batteries. Prolong the lifespan of your expensive lead acid or lithium batteries with this simple device - completely preset to detect battery voltage.

The normally open auxillary side posts of the relay can be used to route a backup charging source to the battery, connect an auxillary battery, and/or activating an alarm when the battery is low. There are many additional possibilities for the auxillary side posts. You can use the Battery Guard with the battery disconnect function and auxillary side post function simultaneously, just battery disconnect, or just the auxillary side posts. The side posts are capable of 150 amps of continuous power.

*Now comes with quick connect lugs accepting 2 to 8 guage wire. Simply cut the positive line to your DC device and wire it back together through the relay quick connect lugs.

Disconnect DC devices running up to:

  • 12 volts, 1200 watts
  • 24 volts, 2400 watts
  • 48 volts, 4800 watts

What does the Low Voltage Shutdown (LVS) do?

The low voltage relay will automatically disconnect the DC power between the batteries and inverter, and/or other DC devices like lights or water heating elements. When the relay disconnects, the inverter will shut down and prevent further draw on the battery or batteries. Once your batteries recharge to a safer level, the LVS will restore DC power to the inverter's DC inputs. The LVS will prevent deep discharges of your battery bank that shorten the life of your batteries.

Keep in mind that some power inverters need to be manually reset i.e. flipping the power switch back on if power is removed from the DC input. There are too many inverters to test in house, so we suggest you follow the next step to determine if your inverter requires a manual reset. In our testing process, some of the inverters resumed power, and some did not.

To test your inverter before purchasing the Low Voltage Shutdown, disconnect your DC to AC power inverter on the DC side and let it sit for 5 minutes. Reconnect the DC power source. If you have to manually reset the inverter, this will also be the case when using the LVS.

Battery Bank Voltage Shutdown Voltage Return Operation Voltage
12V 12.1V 12.5V
24V 24.2V 25V
48V 48.4V 50V



  • 100 amp capability
  • 5.5 foot long battery sensor leads for easy connections
  • Arc suppressor to prolong the life of the mechanical relay
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