RF Battery Monitor with Receiver (HMRF2000)

RF Battery Monitor

Its is now a legal requirement in some states that you monitor the battery voltage of your trailer/caravan.

Hummingbird Electronics' RF Battery Monitor allows the user to monitor a remote battery without having to run wires to it.

No costly installation needed to monitor caravan, boat, fridge, solar and many other batteries.

Powerful Performance

The RF Battery Monitor measures battery voltage of up to four remote batteries and and displays it on a remote colour screen.  Alarm levels can be set such that the unit warns the user with a screen colour change and an optional buzzer.  Both minimum and maximum alarm voltages can be set by using the keypad in conjunction with an on-screen menu.  Batteries can be given names that are relevant to the application.

The RF Battery Monitor uses a long range RF technology meaning that communication is reliable in all configuration of car and trailer.   Ultra-low power voltage transmitters are able to be left permanently connected to batteries and do not need to be switched off when not in use. Both 12V and 24V batteries can be monitored.

Installation is as simple as attaching the red and black terminals on the transmitter to the battery that needs to be monitored and plugging the receiver into a cigarette lighter socket.  The receiver can also be permanently powered if desired. 

The receiver is mounted with a flexible windscreen-mount, but can also be attached using any standard camera mount including those available from RAM.


  •  Uses RF technology to transmit voltages
  •  Optional buzzer for under or over voltage
  •  Changes colour for under or over voltage
  •  User adjustable limits per battery
  •  Optional local battery monitoring
  •  Multi voltage – simply plug into your cigarette lighter plug
  •  Cigarette lighter connection
  •  Precision 100mV measurement
  •  Ultra-low power transmitter can be left connected to batteries

Performance Specifications

  • Acquisition time, power-up: 30 seconds to acquire RF devices
  • Resolution: 100mV
  • RF Frequency: 433MHz
  • Range: 100m line of sight

Electrical Characteristics

  • Input voltage: 9V to 36V
  • Power consumption: Screen: Typical 0.2W (10mA @ 12V; 7mA @ 24V)
                                  Transmitter: Typical 0.05mA (50 microamps)

Physical Characteristics

  • Dimensions, Display: 70mm (width), 50mm (height), 18mm (depth)
                       Transmitter: 46mm (L), 20mm (W), 12mm (H)‏
  • Cable Length: Power cable provided with 1.5m cable

Environmental Specifications

  • Operating temperature: -20°C to 55°C
  • Humidity: 5% to 95% relative humidity

Documentation & Downloads


Hummingbird Electronics has designed the product for use in a broad range of applications. It is however solely the customer's responsibility to evaluate the device and determine it's suitability in their end application.

Hummingbird Electronics does not suggest or make any recommendation as to the suitability of parameters that determine angle, height, impact, speed, force, accident, harsh braking, roll-over or rate-of-turn events, input or output voltage or current. Parameter values stated or implied in this document are for explanation only and should not be taken as typical or representative of a real world situation.


Products are not authorised for use in critical safety or other applications where a failure may reasonably be expected to result in personal injury, loss of life, or catastrophic property damage. If a customer uses or sells the products for use in any such applications, the customer acknowledges that such use or sale is at customer's sole risk. The customer will indemnify, defend or hold Hummingbird Electronics and their electronic component suppliers/assemblers harmless from and against any and all liabilities and costs arising out of or in connection with use of product or sale.
RF Battery Monitor with Receiver
  • RF Battery Monitor with Receiver
  • RF Battery Monitor with Receiver
  • RF Battery Monitor with Receiver

Price (AUD, ex GST) $269.09


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