Battery / Solar Panel voltage and current - Fiberglass RV


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Old 05-14-2015, 12:49 PM   #1
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Battery / Solar Panel voltage and current

On Ebay there are modules that read both voltage (0-30V) and current (0-10A) or (0-100A).
I've done a lot of dry camping and the 2 things that are critical are battery drain current (did you leave something on), and solar panel current to recharge the battery. Also it is nice to know battery voltage accurately as it is an indication of state of charge.
I ordered a couple of these modules (under $5 with free shipping), and they are perfect for the job. They are best used with a push button so they do not introduce a constant drain (mine draws 16ma. Measured), but when you want to know, just push the button. The internal current shunt is in the ground line and is 0.007ohms so costs nothing in terms of power loss.
There is no data sheet when delivered, but lots of data if you Google YB27VA. Simple to hook up: thick black to source -ve (battery or solar), thick red and thin red to both source and load +ve through push button, and thick yellow to load -ve.
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Old 05-14-2015, 12:52 PM   #2
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Here is a schematic.
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Old 05-14-2015, 01:28 PM   #3
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Interesting, thanks for the info.
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Old 05-14-2015, 01:58 PM   #4
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I bought a similar one and the voltage ready volt high. Be sure to check if you buy one. And I could never make sense of the amp readings.

John
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Old 05-14-2015, 02:34 PM   #5
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Hey John. There are calibration pots on the back. Mine came in pretty well calibrated and I didn't change it, but you can make your model track your DVM.


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