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Old 12-16-2018, 01:08 AM   #1
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Default Shunt installation

I would like to install a battery monitor which requires (unless I'm mistaken) the installation of a shunt. However, on my Roadtrek Simplicity, the battery and it electric connection to the chassis are outside under the chassis. Considering this, how could I install/protect a shunt?

The only solution I could think of would be to install the shunt inside after routing the negative cable inside and them outside.

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Old 12-16-2018, 01:23 AM   #2
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Originally Posted by Yoshimura View Post
I would like to install a battery monitor which requires (unless I'm mistaken) the installation of a shunt. However, on my Roadtrek Simplicity, the battery and it electric connection to the chassis are outside under the chassis. Considering this, how could I install/protect a shunt?

The only solution I could think of would be to install the shunt inside after routing the negative cable inside and them outside.

We had the same issue with ours, so when I redid our power system I did bring all the negatives, including chassis, to the shunt inside the van. There have been some installs underneath but you need to keep the shunt clean, particularly of conductive stuff like salt, and cool if you charge a fairly high rate. I think the methods used were to put it in a large surface area aluminum box for cooling, as long as it is a cool area under the van and not by the exhaust or other hot area.


You might also check with the manufacturer of your monitor to see if an Inpower (or other brand) inductive pickup will work with their monitor. Inpower claims that the inductive can replace shunts for most meter types, so that may be a possibility. The inductive is weatherproof and can even mount on the positive cable or negative cable with no cutting needed.
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Old 12-16-2018, 01:39 AM   #3
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Another option is a DC current Hall sensor which can be placed under the van, not as accurate as shunt but could be better than inductive. I used this one, it was OK.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
It is just current meter but I have seen battery monitor. The key issues are that it requires occasional resetting and is not as accurate shunt.
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Old 12-16-2018, 01:49 AM   #4
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Another option is a DC current Hall sensor which can be placed under the van, not as accurate as shunt but could be better than inductive. I used this one, it was OK.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
It is just current meter but I have seen battery monitor. The key issues are that it requires occasional resetting and is not as accurate shunt.

Very similar to the Inpower, but less expensive for sure. Inpower's claim is that they are much more accurate than the other inductive or Hall effect sensors are. We have two of them in our Roadtrek that I use for real time amp readings from the alternators and to the batteries, with Inpower ammeter. Readings less than 2-3 amps are of no concern to us, so I can't speak for the accuracy that low, but they are very good at even 2 amps, when compared to the shunt based monitor we have. The Inpower are configured with a 0-50mv output to directly replace shunts, so easy to install.
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Old 12-16-2018, 04:00 AM   #5
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Very similar to the Inpower, but less expensive for sure. Inpower's claim is that they are much more accurate than the other inductive or Hall effect sensors are. We have two of them in our Roadtrek that I use for real time amp readings from the alternators and to the batteries, with Inpower ammeter. Readings less than 2-3 amps are of no concern to us, so I can't speak for the accuracy that low, but they are very good at even 2 amps, when compared to the shunt based monitor we have. The Inpower are configured with a 0-50mv output to directly replace shunts, so easy to install.
I wasn’t aware off this type of sensor mimicking shunt with +/-0-50mV, so any battery monitor using this voltage range shunt could be used. Learning every day.
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Old 12-16-2018, 05:36 AM   #6
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I wasn’t aware off this type of sensor mimicking shunt with +/-0-50mV, so any battery monitor using this voltage range shunt could be used. Learning every day.
Yep, the 0-50mv is very unique, I don't know if there are any others doing the same thing, or not.


It likely would be compatible with the battery meter, but I think the biggest question would be the accuracy at very low amperages. Shunts are so good at low readings that is hard to compete with them and the hoops have normally been not very good there. When I got ours, I talked to them and got their accuracy data which was typical meter speak terminology with all the percents of reading, plus or minus so much, and plus or minus X significant digits.....so very hard to figure out what it would really be. Even the tech on the phone couldn't give hard numbers, but said at the 2-3 amps I would fine within a couple of tenths, and ours are that close.


Data on the pickup is here:


InPower Direct - Solutions you can count on
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Old 12-16-2018, 11:07 PM   #7
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I really wanted a Victron battery monitor (with Bluetooth) but it won't possible for me to redo the battery wiring before we leave at the end of January. I'm now wondering if I could use the Victron monitor with the sensor you suggested.

If I understand correctly, it outputs 2.5V +/- 50 mV?

Here's Victron settings regarding the shunt.

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Old 12-16-2018, 11:16 PM   #8
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Originally Posted by Yoshimura View Post
I really wanted a Victron battery monitor (with Bluetooth) but it won't possible for me to redo the battery wiring before we leave at the end of January. I'm now wondering if I could use the Victron monitor with the sensor you suggested.

If I understand correctly, it outputs 2.5V +/- 50 mV?

Unless I misunderstand the spec, you would want the +/- 50mv version, which should be the same output as the shunt would be. They say the meter has to have a least 20 ohms of internal resistance, which seems to be the only added requirement. A call to Victron may be a good thing for you to do to see if they would even think it would work.


I think this would be the series of pickup you would use.


http://www.inpowerdirect.com/docs/OM-23D.pdf
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Old 12-16-2018, 11:22 PM   #9
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Yes, I will call them tomorrow.

Thanks again!
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Old 12-16-2018, 11:53 PM   #10
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I'm wondering if I could install the shunt inside a waterproof electrical junction box under the chassis... From the first picture, would it be easy to disconnect the battery cable from the chassis, enter the electrical box and install a new cable to the chassis?

Is heat dissipation a consideration when installing a shunt?
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