question

larseson avatar image
larseson asked

Smartshunt shows different than MPPT and clamp meter

Smartsolar MPPT 100/30 shows maximum 30 amps.
At the same time the Smartshunt 500/50 shows 28,5 amps. Is it a way to have the shunt adjusted to show the correct amps ?
It is a standalone installation. 
SmartShunt
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klim8skeptic avatar image klim8skeptic ♦ commented ·
Screenshots would be helpful.

You mentioned a clampmeter? Post a photo regarding readings.

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larseson avatar image
larseson answered ·

picture showing that MPPT and clamp meter shows approx 30 and shunt 28,5eb196168-31a0-4bc0-9a4f-18a209b6568b.jpeg


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klim8skeptic avatar image klim8skeptic ♦ commented ·
I guess that the lug that is on top of the neg bus goes to a parallel battery?

I think that the SBS bat neg lug should be relocated. Re surface area.

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seb71 avatar image
seb71 answered ·

The MPPT reading (30A) and the clampmeter reading (29.7A) are pretty close. I an assuming the clampmeter is on a MPPT battery wire.


The current exiting the MPPT charger might go to power some loads, not necesarilly to charge the battery. So some or all of it might not pass through the shunt. That's actually the main reason to buy a SmartShunt/BMV.

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larseson avatar image
larseson answered ·

@klim8skeptic I think you are right about the neg lug of the SBS. I relocated it now immediately. It did not change anything. ( I guess the load of the SBS is negligible )

@Seb71 The only load in the system is an inverter. During these tests the cable to it is disconnected. So there is no load connected.

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seb71 avatar image seb71 commented ·

You also have a big lug there (that's the one klim8skeptic asked about). What is that?

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larseson avatar image
larseson answered ·

@Seb71 The big lug goes to a parallell battery. I have 2 LiFePO4 100 Ah in parallell.

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larseson avatar image
larseson answered ·

Is this amount of inaccuracies what I should expect from Victron Energy devices ? Want to know for future projects.

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