smartBMV showing wrong current

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gwmurray asked May 13, '19

smartBMV showing wrong current

I have a smartbmv monitoring my house batteries. To charge them I have a smartsolar mppt 100/30. When the smartsolar is charging the batteries at 4.7a 13v, the smartbmv is showing 8.2a at 12.95v? I have no other chargers in the system. What could be wrong?

Smart Battery Sense

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klim8skeptic ♦ commented · May 13, 2019 at 05:40 AM

Could you have the wrong type of shunt selected?

Page 30 of the manual, 65. shunt current/ 66. shunt voltage.

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gwmurray klim8skeptic ♦ commented · May 13, 2019 at 09:19 AM

Thanks for the fast reply. I just checked and I use the standard shunt that comes with the bmv and it's set to the defaults, 500A, 50mV.

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boekel ♦ commented · May 13, 2019 at 07:47 AM

Can you post a picture of the shunt + wiring?

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gwmurray boekel ♦ commented · May 13, 2019 at 09:23 AM

Thanks for the fast reply. I can post a picture of the shunt wiring but will take a while as a lot of stuff needs to come out of the aft cabin to get to the battery locker. I can say that no neg leads bypass the shunt if that is what you were thinking? it's wired as per the instructions.

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Answer 1 · 2019-05-13T10:04:11Z

boekel answered · May 13, 2019 at 10:04 AM

The most common reason for displaying too much current is when people connect wires to the small screws on the Shunt, these screws are for connecting the circuit board, and nothing else may be connected there.

That's the reason for asking for pictures :)

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gwmurray commented · May 13, 2019 at 05:01 PM

Ah, that will be it. Many thanks for your help.

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