Measuring Solar power production using Shelly 3EM

maqsudbd

Hi All

I am trying to measure solar power production and battery charge power consumption using Shelly 3M. I have attached the connection diagram.

Can you please let me know if I am able to achieve this using Shelly 3 EM. If not, what modification do I need to make? Is there any other Shelly product which can be used to achieve this?

Thanks and Regards

Maqsud

StratosEU

No, not possible to measure DC currents. 3EM is for AC measurement only. (due to the measurement principle)

maqsudbd

Thanks for quick reply.

Is there any other Shelly device that can do?

StratosEU

afaik not out of the Box.

You may use a UNI with a DC-current measurement device.
I dunno what resolution the UNI adc has, but i'm afraid that the resolution is not enough for a reliable accuracy.
Maybe someone other here has experience with that.

sbehnsen

DC current is fairly easy to meaure with the use of a Shunt resistor. I believe the accuracy of the ADC in the UNI should be good enough for that. However you will need a small circuit to amplify the voltage from the shunt to the range that the UNI can measure. Most shunts have about 50 or 60mV / A, so depending on what range you want to measure you may have to amplyfi this a little bit.

Measuring Solar power production using Shelly 3EM

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