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Old 06-07-2018, 10:06 PM   #1
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Shunt Sizing

Hi, my inverter/charger calls for a 300 amp anl fuse and 4/0 wire between batteries and inverter/charger. This is directly from the manufacturer. Would my shunt also need to be 300 amps? Thanks!
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Old 06-08-2018, 12:42 AM   #2
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Shunt for what? An ammeter or a remote meter? What make of inverter is it?

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Old 06-08-2018, 06:50 AM   #3
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A shunt for a battery meter off the negative terminal. The inverter is an Aims 3000 watt (120 volt) inverter/charger with auto transfer switch. I have the remote panel for the inverter as well.
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Old 06-08-2018, 06:53 AM   #4
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I had picked this up awhile ago. Saw that the shunt was 100 amps. Wasn't sure if that was enough for the application. It would go between my battery and the negative busbar I plan on using for all my negatives.Screenshot_20180608-075133.jpeg
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Old 06-08-2018, 07:09 AM   #5
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Would my shunt also need to be 300 amps? Thanks!
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The inverter is an Aims 3000 watt...
You need a shunt that is rated for the maximum current flow that will be passing thru it (either into or out of the battery bank). Assuming you have a 12VDC battery bank, you're inverter will likely be the big ticket item at a maximum of something around 250 amps. Therefore; a 100 amp shunt would be too small. They key is making sure battery monitor can be configured for the size of shunt that you install (100mV vs 500mV).
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Old 06-08-2018, 07:11 AM   #6
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Thank you. That makes sense to me. I guess I will be looking for a different sized shunt and monitor.
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Old 06-08-2018, 07:42 AM   #7
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Thank you. That makes sense to me. I guess I will be looking for a different sized shunt and monitor.
If you are going to do that....

Might I suggest a "good" battery monitor?? They really do pay for themselves (good information that allows you to properly care for your battery bank). A TriMetric (from Bogart Engineering) or even a Victron BMV-700 are good options.
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Old 06-08-2018, 09:05 AM   #8
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Thanks. I was just looking at the Victron
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Old 06-08-2018, 09:27 AM   #9
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Just be aware that all aH-in/aH-out counters such as the Trimetrics have an intrinsic inaccuracy that will get worse with time. Blame Mr. Peukert for that one. Battery SoC meters such as the SmartGauge, and to a lesser extent the NASA ones, overcome this limitation because they operate on a completely different basis, using algorithms derived from voltage under load. (This doesn't mean that you can just connect your $20 multimeter to a battery and call it good!).

Another effective way to know the true health of any FLA battery is to measure its SG using a good hydrometer. pH never lies!

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Old 06-08-2018, 09:41 AM   #10
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I'll be using AGM batteries
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