OpenEVSE reports wildly inaccurate energy or kWh usage compared to utility meter or vehicle logs.

Safety first: Turn off power before moving the CT.

• Step 1 – Verify CT installation: Ensure the CT is fully closed around the correct line conductor and not around both line and neutral.
• Step 2 – Check firmware settings: Confirm that the CT type and calibration values in the firmware match the installed CT.
• Step 3 – Compare with clamp meter: Measure current with an external clamp meter and adjust calibration if your firmware allows.
• Step 4 – Replace CT: If readings remain inconsistent, replace the CT sensor or CT board.