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I have been trying to log both voltage and current from the battery of an electric two wheeler for finding out efficiency at inverter, battery level.

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  • \$\begingroup\$ So what have you done and what don't you know how to do? \$\endgroup\$ – Sunnyskyguy EE75 Mar 11 at 3:05
  • \$\begingroup\$ Thank you for your response. \$\endgroup\$ – user215179 Mar 11 at 3:13
  • \$\begingroup\$ I want to know, measure the power consumption of my 3 phase BLDC motor , I have been getting a very noisy signals when I tried measuring current using a shunt and voltage drain from the battery \$\endgroup\$ – user215179 Mar 11 at 3:15
  • \$\begingroup\$ @SunnyskyguyEE75 its 60v 20ah supply , motor (250watts). Power consumption from the battery, which I calculated turned out to be as high as 2000watts. \$\endgroup\$ – user215179 Mar 11 at 3:18
  • \$\begingroup\$ Do you have a problem using shielded twisted pairs using an INA? with ground shld terminated only at ADC. \$\endgroup\$ – Sunnyskyguy EE75 Mar 11 at 4:03
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If you have a scope available you can look at the input and determine if you have noise or if the problem is with your sense circuit. You could also try to add some capacitors on the input this might fix your problem if noise is the issue. You can also use an multimeter to determine if your current measurements are correct or you can invest in an VESC which can log power at both the input and output.

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