how to wire in a shunt for battery?

Posted by James Johnson on June 27, 2008, 08:03:56 AM

Can anyone please explain to me where and how a shunt goes in for use with a battery monitor?

the monitor I'm looking at is this one.

http://store.altenergystore.com/Meters-Communications-Site-Analysis/Meters-Battery-Monitors/Ammeters-Voltmeters-Battery-Monitors/Bogart-Engineering-PM-100-D-PentaMetric-Display-Unit/p252/

Thanks

James

Posted by John D on June 27, 2008, 09:30:57 AM

Re: how to wire in a shunt for battery? (Reply #1)

A shunt goes in SERIES with the battery wiring. All of the current passing into and out of the battery passes through the shunt. The shunt is actually just a low risistance, high power resistor. When current passes through it, a small voltage will be present across it. The amount of voltage will change, depending on the size of the load. The battery monitor measures this voltage and keeps track of it over time. Using ohms law, the amount of current in and current out can be calculated, and the approximate battery state of charge can be determined.

You should check the instructions that come with the shunt and the battery monitor for exact mounting instructions and precautions.

Hope this helps.

John

Posted by Thomas Allen Schmidt on June 27, 2008, 06:24:56 PM

Re: how to wire in a shunt for battery? (Reply #2)

Hi James
If you will, go to the page that you have created a link to and scroll down until you see - Product Documentation - and all the way to the right is a + sign, then click on that. A window will drop down with three choices, click on the PDF file that is a diagram, the second one down I believe. This will show you where and how to wire in the shunt on the negative side of the system depending on what you want to measure, wether its battery state of charge or perhaps just PV output or whatever.

Posted by James Johnson on June 27, 2008, 08:49:39 PM

Re: how to wire in a shunt for battery? (Reply #3)

I see it now thank you Thomas...seems simple enough to hook together...will be nice to measure my small array and small battery bank..and also be set for future expansion...

Thanks

James

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how to wire in a shunt for battery?

Posted by James Johnson on June 27, 2008, 08:03:56 AM

Posted by John D on June 27, 2008, 09:30:57 AM

Posted by Thomas Allen Schmidt on June 27, 2008, 06:24:56 PM

Posted by James Johnson on June 27, 2008, 08:49:39 PM

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