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Shunt and Battery Monitor

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#21 Dirt Rider

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Posted 19 August 2019 - 04:03 PM

If I can ask a stupid question, I am going to add a second battery in parallel, how do I add a shunt for each battery, and how will it know which battery it is seeing if both are connected?


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#22 buckland

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Posted 19 August 2019 - 04:36 PM

Well what I know wouldn’t fill a shot glass but if you are making one big battery outta two.... why would you need two shunts? They are performing as one battery unit.
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#23 Dirt Rider

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Posted 19 August 2019 - 05:04 PM

So I know the charge on each battery individually 


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#24 buckland

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Posted 19 August 2019 - 05:53 PM

Shouldn’t the charge be the same if they are in parallel ?
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#25 Dirt Rider

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Posted 19 August 2019 - 07:15 PM

Thats the problem, cannot get a real sense of each battery, idealy they should be the same, but if not how would I know?


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#26 buckland

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Posted 19 August 2019 - 08:21 PM

All I would do is disconnect occasionally and put an ohm volt meter on each post to test each battery separately. Would only take a second or two. Otherwise if they are the same type battery attached in parallel they should wear the same. Not a good idea to attach two batteries that are different ages.
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#27 Vic Harder

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Posted 19 August 2019 - 09:06 PM

This is a great question.  The BMV has an option for "mid point" voltage testing, but that only works for series connections. 

 

As Buckland suggests, the two batteries should be identical in makup/brand/age.  To use the shunt as intended, I would suggest using a buss connection for both batteries to ground to, and from there go to the shunt.  You will NOT be able to see individual SOC for each though


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#28 PaulT

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Posted 19 August 2019 - 09:40 PM

I’ve wondered when someone would ask this question. :)

For a short time, it bothered me that this info was unavailable, but the cost of obtaining it is well past the point of diminishing returns, IMHO.

If it is a concern, attach the positive lead from solar & load on one battery, and place the negative lead from the shunt on the other battery, swallow hard & enjoy your camping. Life keeps getting shorter.

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I thought getting old would take longer.





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