# New install - Do I need to calibrate my CTs or Feeds?

**URL:** <https://community.openenergymonitor.org/t/new-install-do-i-need-to-calibrate-my-cts-or-feeds/182>\
**Category:** Hardware\
**Tags:** calibration, ct\
**Created:** [5 May 2016 06:33 UTC](https://community.openenergymonitor.org/t/new-install-do-i-need-to-calibrate-my-cts-or-feeds/182 "2016-05-05T06:33:09Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![bidouilleur](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/bidouilleur/32/12_2.png) [@bidouilleur](https://community.openenergymonitor.org/u/bidouilleur)\
**Post date:** [5 May 2016 10:22 UTC](https://community.openenergymonitor.org/t/new-install-do-i-need-to-calibrate-my-cts-or-feeds/182/3 "2016-05-05T10:22:47Z")

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I have the same problem and it was already the case with another CT monitoring system

When i added an Amp meter in the circuit there was hardly any amp usage and the CT gives 30 W (have 3 inverters installed right now)

Someone told me it is ‘circular current’ (don’t know how to translate better sorry).

Maybe a real geek can explain ? 🕶

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_[View the full topic](https://community.openenergymonitor.org/t/new-install-do-i-need-to-calibrate-my-cts-or-feeds/182)._