Posts tagged with "energy-meter"


  • Feb 17, 2024

    DC Energy Measurement Using INA226

    In an earlier post I wrote about measuring DC energy using PZEM 017. If you recall, I ended the article with a couple of remarks. One was that the device was unable to measure current below 0.02 A. But the bigger problem was that the device could only measure current in one direction. It is uni-directional current sensor. I cannot use this device with my UPS to measure charging and discharging current since I need a bidirectional current sensor in that case. After some searching around I found a few options and one good sensor which is the INA226. So here is a write up of my experience with it. This can get a bit technical, so if you are not into electronics, give this a skip.

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  • Nov 27, 2023

    DC Energy Measurement Using PZEM 017

    You might remember that I have been looking for an accurate DC current measuring device for a long time for my solar project. The hall effect sensors I have been using in my solar project was inaccurate. Basically the zero current point drifts quite a bit depending on the ambient temperature and power supply voltage. While a shunt would give more accurate zero cross overs, I did not want to modify my setup to use it. You see, the problem with shunt resistor based sensors was that they have to be inline with current. Which means I have to remove a bunch of wiring from my battery and UPS and insert these sensors inline. I was not willing to do that. However I recently came across another project which would be a good fit to test out these shunt resistor based sensors. So I tried a couple of them and what follows is my experience with one of them.

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