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Old 01-17-2018, 05:22 PM   #15
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Thanks Jay, I'm just looking at my 3-0 AWG battery cables, and the shunt and the shut sure looks inadequate.
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Old 01-18-2018, 06:48 AM   #16
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Thanks Jay, I'm just looking at my 3-0 AWG battery cables, and the shunt and the shut sure looks inadequate.
There are 500A shunts available; see the one at this link.

You might want to consider buying a Trimetric, Victron or Magnum battery monitor and shunt, rather than the less-expensive ones.
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Old 01-18-2018, 07:10 AM   #17
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We don't dry camp much and I just wanted a cheap battery monitor to let me know current usage on the rare occasion we do dry camp. I had a Victron monitor on my boat on which we anchored out a lot. It's a good monitor and served it's purpose well, but not cheap.

Below is a picture of the shunt next to a battery cable (3-0 AWG) in my coach.
The 2 little bars running between the two terminals on the shunt must pass the same current as the cable.

I might post this picture on a new thread to get a wider audience and see what they think as to the shuts suitability.
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Old 01-18-2018, 10:20 AM   #18
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I just found out the same unit comes with a 300 amp shunt. The 300 amp shunt looks the same but with 4 small bars between the terminals instead of 2.
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Old 01-18-2018, 01:30 PM   #19
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Yes, that is a very stark comparison. My cables are much smaller. The 300 amp capability should serve you better. In my case, I was primarily concerned with my 1K Watt continuous duty inverter as a limit.
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Old 01-19-2018, 06:28 AM   #20
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I just found out the same unit comes with a 300 amp shunt. The 300 amp shunt looks the same but with 4 small bars between the terminals instead of 2.
Where did you find it?
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Old 01-19-2018, 06:39 AM   #21
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There are 500A shunts available; see the one at this link.

You might want to consider buying a Trimetric, Victron or Magnum battery monitor and shunt, rather than the less-expensive ones.
I've considered a Trimetric for years, but the price has held me back. Maybe for the next unit. Meanwhile the cheap ones have my attention for my 7 year old fiver.
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Old 01-19-2018, 07:14 AM   #22
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Where did you find it?
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 01-19-2018, 07:27 AM   #23
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Your RV will never draw more than 50 amps will it?
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Old 01-19-2018, 06:02 PM   #24
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Your RV will never draw more than 50 amps will it?
Well the inverter is protected by a 300 amp fuse, so I'm assuming it does.

2 things to consider, a 50 amp camp ground power pole is really providing 100 amps of AC current, 50 amps at L1 and 50 amps at L2 for a total of 100 amps and 12000 watts.

Also we are talking about DC current. It only takes 3600 watts to get to 300 amps when using 12 volt DC. Many microwave's use 1800 watts when running, half way to the 300 amp fuse.
At least as I understand it.
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Old 01-26-2018, 01:51 PM   #25
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The DROK includes the shunt. I selected the 100A unit to be able to account for the power consumption of my smallish inverter.
Jay, I'm having some trouble getting my DROK unit to work. I ordered the 300 amp shunt. I connected the shunt with the terminal that has a small black wire connected to it, I connected this terminal to the battery. I connected the other terminal with a small red wire attached to the load.
I then connected a wire with 12v positive to the red wire on the pig tail supplied with the unit that plugs into the display. I connected another 12v positive wire to the Vn+ terminal on the shunt. I connected the USB cable supplied with the unit to the shunt and the display.

The display works but I get 0 readings on everything. I disconnected the Vn+ wire and the display still works but no values except 0. If I disconnect the 12v going to the display, the display blanks.

Any help on getting this working is much appreciated.
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Old 01-26-2018, 02:49 PM   #26
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I then connected a wire with 12v positive to the red wire on the pig tail supplied with the unit that plugs into the display.
Everything makes sense to me except the above statement, as, the USB connection supplies 5v and ground to the display from the shunt, and, 12v should only be connected to Vn+.

Maybe I'm missing/misunderstanding something.
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Old 01-27-2018, 03:14 PM   #27
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Thanks Jay, I hooked it up as you said and it appears the unit is not getting data from the shunt.
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Old 01-27-2018, 09:19 PM   #28
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Jay, I'm having some trouble getting my DROK unit to work. I ordered the 300 amp shunt. I connected the shunt with the terminal that has a small black wire connected to it, I connected this terminal to the battery. I connected the other terminal with a small red wire attached to the load.
I then connected a wire with 12v positive to the red wire on the pig tail supplied with the unit that plugs into the display. I connected another 12v positive wire to the Vn+ terminal on the shunt. I connected the USB cable supplied with the unit to the shunt and the display.

The display works but I get 0 readings on everything. I disconnected the Vn+ wire and the display still works but no values except 0. If I disconnect the 12v going to the display, the display blanks.

Any help on getting this working is much appreciated.
Unless I'm missing it, you didn't mention what you did with your negative cables. You should attach the negative cable from your RV to the large stud on the opposite end of the shunt away from the end with all the small screws. Then you have to supply another large cable to run from the other large stud to the negative post on your battery. (I hope I'm explaining this clearly enough.) Did you do that? I also found that the usb connection to the shunt is rather loose. Sometimes moving the cable slightly will cause the numbers to appear/disappear.
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