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BM-1 Battery Monitor

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Additional Info
pdf BM-1 battery wiring diagram.pdf (1.5 MB)
pdf BM-1 Manual.pdf (7.1 MB)

The BM-1 is designed to monitor performance of 12 volt lead acid battery systems with capacities of up to 600 Amp hours. It is supplied complete with a precision 100 AMP shunt and a prefabricated cable assembly to enable simple DIY installation.

The unit continuously monitors voltage, current (charge or discharge), number of amp/hours (charge or discharge), the batteries state of charge and the time to charge or discharge. This information leads to more efficient use of the battery, which can enhance battery life and reduce the risk of failure.

British designed and manufactured, these Marine Instruments have become known worldwide as robust, reliable products that are superb value for money. All products comply with tough European standards for electromagnetic compatibility and are guaranteed for 12 months.



Supply voltage

8 - 16 Volts DC


Supply current

1.5 milliamps


Battery capacities

5 - 600 AMP Hour

Load current

100 AMPS Maximum

Charge current

100 AMPS Maximum


Standard 50 millivolt @ 100 AMP

Cables supplied:

100 AMP shunt link to M8 Ring terminal.
5 Metre from display unit to battery - fused and fitted with ring terminals for shunt, fuse holder and M8 ring terminal to battery.

Display unit

Standard 110mm square Clipper case. High contrast LCD, backlit for night viewing.
Minimum voltage visual alarm
Simple operation select backlight, Volt/Amp/State of Charge screen,
AMP hours or Time to run.


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