Question about shunts

[JoRow]

I have a renogy 40amp MPPT with the mt-5 remote and I've heard that you need to install a shunt for a proper SOC reading. How do I know what size to use? I didn't see anything in the manual about installing a shunt...


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[highdesertranger]

the mt-5 remote is a controller for your charge controller. it does not tell you SOC. the shunt is for the amp counter meters. a shunt lets the meter count amps in and amps out. highdesertranger

 

[JoRow]

Is this just giving me a reading based off of my voltage then? My voltage on my cheap meter right now is reading 13.1v right now after a full day of charging and this mt-5 said the battery was full earlier and now that the sun went down its reading 50%


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[frater secessus]

Renogy says that on the MT-5 Tracer Meter:

The SOC% on the meter is not the battery capacity but a percentage based on the charging voltage the controller is outputting. The SOC% will only be accurate during float stage.

I think this answers why the SOC% reading on the MT-5 went wonky when the sun went down.  They might have been better off to just blank that field when the controller isn't in Float.

 

[ccbreder]

Try this; http://www.pbase.com/mainecruising/battery_monitor If that link expired search through; http://www.marinehowto.com/

 

[JoRow]

Try this; http://www.pbase.com/mainecruising/battery_monitor If that link expired search through; http://www.marinehowto.com/

It looks like this article is the key to all of my answers about monitoring my bank.

Now I just need to comprehend it...

This will take some time. Thank you!!


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