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Camper Mod Contest Entries

TriMetric TM-2030 RV Battery Monitor Installation

Welcome to the fourth entry in May’s Medium Mod Contest.  One Medium Mod will be published in every Email Alert in May.  At the end of the month we’ll hold a reader vote to determine May’s winner.  Click here for information about the 2020 Mod Contest, including how to enter.

Ray Fair, Hopkinton, Massachusetts
TriMetric TM-2030 RV Installation
2016 Chevy Silverado 3500
2015 Eagle Cap 850


Above: The above video shows how and where the TriMetric TM-2030 was installed

I started to notice that our two one-year old Group 27 Interstate batteries were not performing as they had when newly installed.

During the day our 100-amp solar panel would energize the batteries to 12.8-volts.  However, once the sun went down, so did the voltage during the night.

With an early morning voltage reading either in the high 11s or low 12-volts, our confidence in the system also dropped.

I took the batteries to Interstate for a load test and they confirmed that the batteries needed to be replaced.  It was attributed to too much boondocking and repeated charging cycles.  As a FYI, the warranty is only one year, and they were just over one year old.

Before buying new batteries or adding additional solar panels, I wanted to improve my ability to monitor the status and charge of my house batteries.  Specifically, I wanted to know what our energy use was during the day in amps and watts.

I also wanted to be able to accurately gauge the battery percentage of charge, and see the total solar input current and amp hours.  And all of this needed to be in a system that was easy to use and understand.

TriMetric TM 2030 RV Installation

After considerable research, I chose the TriMetric TM-2030-RV system. This device taps into the camper’s electronics and checks all of the vital battery characteristics including voltage level, current draw, charging, etc.

Trimetric Meter Percentage Full

The TriMetric TM-2030 system consists of two parts; the meter and the shunt. There were two shunts to choose from – the 500A/50mV or 100A/100mV size.  I selected the 500 amp-50 mV shunt that provided ampere read out as low as 0.1 amp.

The meter case is a white plastic box and would stand out among the other black panels nearby.  For aesthetics, the meter was removed from the box and painted black.

Then one hole was drilled in the plastic box to allow the cable to enter the box. The lower flange of the box was placed behind the climate control unit with one screw used to secure the box to the wall.

Per the instructions, a cable was run between the negative post of the battery to one side of the shunt. Additional wiring was run between the meter and positive post of the battery, and the shunt to the meter.

Trimetric 2030 RV Power Draw

Successfully installed, the TriMetric TM-2030 displays volts, amps and percentage of full charge.  A flashing light indicates when the battery is charging.  There is also a light that flashes when the battery should be recharged, equalized, or if the voltage is low.  In addition, the TriMetric TM-2030 provides a history of the battery’s status.

As always, running the wires was the most challenging part of the job, and all this was done while boondocking in the jungles of Florida!

It took me two-hours to complete this modification and cost me $350.  In my opinion, the skill level of this modification is medium.

Disclaimer: The modifications above are submitted by Truck Camper Magazine readers. It is your responsibility to make sure that any do-it-yourself modification project you undertake is safe, effective, and legal for your situation.

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If you’d like to enter a modification you’ve done on your truck camper, click here. You can enter as many mods as you want, at any time.  Good luck mod makers!

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