RM12-2 Single/Dual Bank Battery Monitor for Battery Chargers


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Ideal for monitoring alternator, charger & battery performance. Designed for most 12V battery chargers including Kussmaul, Newmar & Blue Sea. Features a 3-color LED battery condition bar graph & works with both single & dual battery bank battery systems.

General Information

The RM12-2 is a 3-color LED Bar Graph Remote Meter/Monitor that displays battery charger and battery status. The RM12-2 can be used to monitor single or dual battery bank systems. The RM12-2 meter may be connected to the charger's DC output or directly to batteries. The RM12-2 may be used with most 12V battery chargers/systems including Kussmaul, Powerwerx EVC-45, Blue Sea P12 series chargers, NEWMAR 12V battery chargers. The RM12-2 is a direct replacement meter and upgrade for most emergency vehicle remote meters.


  • 6 Segment Three Color LED Meter Quickly Displays Battery Status
    Green = Good Battery Condition
    Yellow = Medium Battery Condition
    Red = Low Battery Condition
  • Auto Dim Feature w/ Auto Bright Technology
  • May be used as a Single or Dual Bar Graph Battery Display
  • Direct Replacement for most Emergency Vehicle Remote Meters
  • Measures 9-16 Volts DC
  • Auto Sleep Feature allow meter to turn off after 24 hours, increasing battery life
  • One Touch “Wake Up” feature turns meter ON from sleep mode
  • Front Panel of Meter is Waterproof for Mounting in Exposed locations
  • Built-in Over Voltage Warning Display
  • Low Battery Warning Display Mode
  • Meter Size: 4.75"W x 3.125"H x 0.73"D
  • Display Front Panel: Waterproof & UV Protected

Meter Power Up Mode

This remote meter starts up in the test mode anytime power is applied. Both bar graph meters and the "Charger On" LED will rapidly flash for 5 seconds which test the meter. After the initial test the RM12-2 will display the current battery bank charge status. 

Meter Display Calibration

  • 6 LED Bars flashing Red, 15.0 – 17.0V, CAUTION-Overcharge condition
  • 6 LED bars GREEN Color, 13.2 - 14.9V, Charging Mode
  • 5 LED Bars GREEN color, 12.8 – 13.2V, Battery Good
  • 4 LED Bars GREEN color, 12.4 – 12.8V, Battery Good
  • 3 LED Bars YELLOW color, 12.0 – 12.4V, Battery Medium
  • 2 LED Bars RED color, 11.6 – 12.0V, Battery Low
  • 1 LED Bar RED color, 11.1 – 11.6V, Battery Critical
  • 1 LED Bar FLASHING RED, 9.9 – 11.1V, Check Battery

Battery Save Mode

The RM12-2 will automatically go into a power saving sleep mode after 24 hours without a charging voltage present from a battery charger or alternator.  During the sleep mode the remote meter will momentary flash every three seconds.  The meter includes a front mounted "Wake" button. Pressing the "Wake" button will turn ON the remote meter and place it into the normal display mode for an additional 24 hours.  In addition, any time the meter sees a charging voltage of 13.0 volts or higher, the meter automatically wakes up and switches to the normal operating display mode for the next 24 hours.

Auto Bright Technology

The RM12-2 features Auto Bright Technology which will auto-adjust the meter’s display brightness to the surrounding ambient light level.  For example, on a bright sunny day the LCD meter will auto adjust to its brightest level. Conversely, in a nighttime or dark environment, the LCD meter will auto dim to a lower light level so it is not to overwhelmingly bright during low light conditions. The RM-12-2 features 6 brightness display levels that are automatically adjusted based on the ambient light level from the meters built-in photo cell.

Installation Instructions

Depending on your installation requirements, the RM-12-2 Remote Meter is very versatile and may be installed in a variety of locations.

Mounting Instructions

If this meter is to be mounted in an exposed area, apply a small bead of silicone to the underside flange of the remote meter to reduce the chance of getting moisture behind the meter where the connection points are located. Mount the meter using (4) screws with (4) lock washers and (4) nuts (user supplied). Please see the included mounting template on page 4 on your documentation for mounting your RM12-2 remote meter.

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