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Old 06-16-2011, 03:25 PM   #1
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What is a "SHUNT"

Note: Requires either a 100 amp or 500 amp shunt.

I'm going to get theTrimetric TM-2025A Battery Monitor System but it says that it requires a "shunt." What is a shunt?

Thanks for the help.
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Old 06-16-2011, 03:47 PM   #2
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A shunt is a simple electrical link with a very small amount of resistance. It enables the monitor to measure the electrical properties on either side of it to determine the direction and amount of current flow.

Scroll down towards the bottom of this page and you'll see a couple examples: http://www.micromediaplus.com/microlog_dmm-3_dmm-4.html
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Old 06-16-2011, 03:55 PM   #3
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A couple of the dealers show that the shunt is included. See here: Trimetric 2025 RV


Edit: On second look, it's not exactly clear. Maybe Herk will chime in and share his experience with the Trimetric.
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Old 06-16-2011, 05:27 PM   #4
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Quote:
Originally Posted by Boyd View Post
Note: Requires either a 100 amp or 500 amp shunt.

I'm going to get theTrimetric TM-2025A Battery Monitor System but it says that it requires a "shunt." What is a shunt?

Thanks for the help.
http://en.wikipedia.org/wiki/Shunt_(electrical) My guess that in this application the section re current measurement in the reference is probably what you are looking for.

...VTX-AL
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Old 06-17-2011, 07:32 AM   #5
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The shunt is extra.

I bought the big one 500 amp shunt for Trimetric & other meters and was lucky I did.

The 50 amp shunt would have been WAY too small with the inverter pulling upwards of 150 amps when tasked.

New photos of the 12VDC panel I made. The big switch kills power to the landing gear (so no smart a** crushes my rear stabs or runs the camper down onto the hood of my DW's car). The long vertical plastic cover is the 150 Amp Fuse for the inverter. The big brass thing is the Shunt for the Trimetric. The red rubber covered thing is the auto reset current limiter for the camper and it connects to the buss I made to hang the fuses for left and right main slides and the landing gear. The red wire at the end goes to the pin box and another current limiter to protect the TV system; then on to the WFCO power center.

The white wires are ground wires. ALL 12VDC current into or out of the batteries MUST pass through the shunt in order to get accurate measurements. The thin bundle of wires is from the Trimetric computer on the wall in the camper.
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