Tonal Low Battery Voltage Monitor 12V Bank Detector Discharge Voltmeter Alarm

Regular price $22.95


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Monitor your battery or battery bank for a low voltage condition, Know when the battery must be charged. Stackable for multiple battery banks. Extra loud tonal alarm and indicator. #BTM6

Includes 60 inch fused cable.

Battery life is reduced when the battery discharge goes below 50% of charge. Often when using a 12 volt battery, the battery can become fully discharged. While the battery can be recharged the life of the battery is greatly reduced. You can extending the life of your battery by charging when the battery not fully depleted. Unless you are constantly monitoring the voltage level you will not know when to start the charge. Most marine, motorcycle, and automotive style batteries must be recharged when discharged to the minimum level. If the battery is left to discharge beyond that point, its power capacity is permanently reduce shortening the life of the battery. If the battery is left to fully discharge, when stored for a prolonged period or excessively drained, the battery can be ruined.

This wired 12 volt battery monitor panel prevents that condition measuring the battery voltage and alarming when the low voltage point is reached. It is ready to install, comes with instructions. Alarms when battery voltage drops to the minimum voltage level, the point when the battery must be recharged to prevent permanent damage.


A three position switch allows you to turn the monitor on and off while the voltmeter continues to monitor the state of the battery. The built in high pitch tonal alarm and a red warning LED alerts you to the low battery condition. The alarm is reset when the battery is plugged into the charger and the voltage is restored. Comes with a waterproof fused cable.

Switch position I - Voltage monitor alarm active. Voltmeter off (Reduced power consumption position).

Switch position 0 – All off

Switch position II– Voltage monitor alarm active, Voltmeter display on.

This pre-wired assembly consists of a built in battery voltage monitoring circuit board, a high quality voltmeter for checking the voltage level of your battery, built in tonal alarm and red indicator, and a three position waterproof switch to control the panel.

The panel monitors your battery when the voltage drops to 12.0 volts the alarm goes off telling you to charger your battery before permanent damage is done to your battery in the low discharge state.

Mounting and installation

The mounting plate allows the assembly to be mounted in a panel of any thickness.

A 60" cables with female 0.250 disconnect crimp terminals, come with a waterproof fuse holder and 15 amp fuse.

-Working Voltage: DC 8-15.5 Volts +/- 10% Do not exceed 16 volts.

- Monitor trip voltage 12.0 volt +/- 10%, adjustable 10-13 volts. Factory set.

-Polarized male 0.250 stud disconnect crimp terminals.

- Alarm:

Piezoelectric 3900 +/- 500 Hz

Sound volume: 80 db

LED Brightness:?500cd

Operating Current:

Monitoring current less than 10 ma

with alarm condition 15 ma.