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If your home, boat, motorhome or bach depends on batteries for electrical power, here is why a battery system monitor should be part of your electrical system.

A battery monitor help save your valuable energy by letting you see how much power you are using and where abouts you are using it.
A battery monitor will help to locate any problems in your system when they occur, and it will display the information you need to know in order to protect your valuable battery investment.


Bogart Engineering

TriMetric TM2030A/RV

PentaMetric PM-5000

MidNite Solar

MNBCM Battery Capacity Monitor

MNWBjr WhizBang Junior


TriMetric TM2030A and TM2030-RV

The TM-2030-A and TM-2030-RV operate the same, and are operationally very similar to the previous
TM-2025. The  difference between the "A" and "RV" version is only the size and label colour.
The TM-2030-RV includes the enclosure shown. The TM-2030-A mounts in a double gang electrical box
(not included).

Measures battery % full, based on amp hour measurements for accurate information on how much
battery energy is left. This method is more accurate than monitors that use only voltage to determine
how full your batteries are, especially when they are between 30-90% full.
Battery system size: 10-10,000 amp hours.

Measures battery charging or discharging amps, or watts: To check that chargers are still charging at
proper amounts—also to check to see how much your loads are drawing—and to discover phantom
24 hour loads that you may not know about.
Measures battery volts (9.0 to 75): to verify that chargers are charging to correct voltage for your batteries.
New with the TM-2030:Audible low battery alarm, based on volts and % full. May be silenced.
Measures days since charged:  Shows how many days have elapsed since batteries were last
fully charged. Batteries can lose the ability to hold charge if days since a full charge becomes too long.
Shows days since equalised: A reminder to equalise at the appropriate time if you do manual equalisations.
New with the TM-2030: Displays replaced percentage of charge, compared to most recent discharge--
Many battery company experts are now recommending that when recharging, 110-120% of recently
withdrawn energy should be replaced for wet cell lead acid batteries to prevent loss of capacity—
and 104-108% for AGM types. This new function makes it easy to know if they have been sufficiently charged.
Good lightning protection.
Easy to read display: Adjustable brightness control
Defaults to "Level 1" for most users to keep operation simple. Choose Level 2 or 3 for more technical users.
Logged data functions: You may not need this, but a technician trying to diagnose what is wrong will find these
very helpful:

 Data for each of last five charge/discharge cycles:

        ● Length of the cycle.     ● How long ago the cycle ended.     ● Lowest % full reading
        ● Lowest battery voltage.     ● Cycle charge efficiency (percent)

Data for each of the last five days:

       ● Highest voltage that day.     ● Lowest charging current.            ● Total percentage overcharge for that day.
Sizes: TM2030-RV is 7.6 x 13.3 x 2.6cm deep.
           TM2030-A  is 11.4 x 12.06 x 3.175cm deep
Requires one of two shunts: 500A/50mV shunt allows amp measurements from 0.1-over 400 Amps.
100A/100mV shunt allows amp measurements from 0.01- over 70 Amps. Larger shunts allow higher current limits.

shown in Double Gang
Electrical box (Not included)



PentaMetric Battery System

The PentaMetric battery monitor system offers a lot more capability than the TriMetric monitors. The PentaMetric has the capability for doing system data analysis utilizing a computer.    It is suited to more complex, larger battery systems.

  • It measures 1 or 2 battery systems with a common negative.

  • With a one battery system, battery current plus two charging current sources can be separately measured. Two voltages can be measured. Watts, watt hours and amp hours are also measured.

  • It has a computer interface that can control and read data on a local computer, or also over the internet.  

  • It can log data that can be imported to a spreadsheet and graphed to analyze performance and diagnose system problems.  System efficiency  (ratio of amp hours charged to amp hours discharged for each charge cycle)  is regularly logged.

  • Regular “real time” system data is available along with audible and visual alarms  with PentaMetric display unit that has a two line LCD display readout.

  • The PentaMetric requires more knowledge and commitment to fully utilize its capability than the TriMetric.

                    PM-101-CE                        PM-102-USB
Computer Interface       Computer Interface            Computer Interface
RS232                          Ethernet                            USB

PM-5000-U Data Logging Unit

PM-100-D Display Unit






The Battery Capacity Meter, or MNBCM from MidNite Solar, was designed as an easy-to-read meter to aid in keeping batteries alive longer.


  • LED's that correspond to battery voltage.

  • Accuracy +/- 0.05%.

  • Auto sensing for 12/24/36/48 volt batteries.

  • LED indicators show if batteries have received a full charge recently, longer than 1 week or longer than 2 weeks.

  • Ideal for 'at a glance' readings.


MidNite Whiz Bang Junior
Current Sense Module                   


The Whiz Bang Jr is a current sense module that attaches to the standard 50mv / 500A Shunt and wires into the Classic and KID charge controllers to give Amperage readings from the shunt. It's a simple way to keep track of how much power is being added to, or taken away from, the battery bank.

The Whizbang Junior provides highly accurate current sensing when used with compatible Midnite Solar products . However, for customers that already own similar battery-monitoring products, the Whizbang Jr. has been designed for cooperative attachment, as well.



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