# CT Accuracy / Calibration

**URL:** <https://community.openenergymonitor.org/t/ct-accuracy-calibration/24859>\
**Category:** Hardware\
**Created:** [23 November 2023 15:01 UTC](https://community.openenergymonitor.org/t/ct-accuracy-calibration/24859 "2023-11-23T15:01:01Z")\
**Posts on this page:** 1\
**Showing post:** 7

<div class="post-metadata">

**Author:** ![dBC](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/d/5f9b8f/32.png) [@dBC](https://community.openenergymonitor.org/u/dBC)\
**Post date:** [25 November 2023 04:01 UTC](https://community.openenergymonitor.org/t/ct-accuracy-calibration/24859/7 "2023-11-25T04:01:20Z")

</div>

When the inverter is matching the house load you’ll probably find the CT is left measuring a very distorted load. The inverter is likely supplying the fundamental and leaving the grid to supply all the harmonics. You can see what my whole-house CT sees under those conditions [here.](https://community.openenergymonitor.org/t/currrent-transformer-issues/20332/5) and again in the post immediately after that one.

---

_[View the full topic](https://community.openenergymonitor.org/t/ct-accuracy-calibration/24859)._