OpenEVSE hardware does not currently measure voltage. The voltage used in energy calculations is assumed to be 120v for L1 and 240 for L2. This value can be changed with a RAPI command or updated real-time with a external source via MQTT.
To change the value for voltage:
Login to OpenEVSE WiFi
Click the "System" Tab
Enable "Developer Mode"
Click on the "RAPI" Tab that is now visible
- Determine the voltage in milivolts while vehicle is charging at the desired current.
- Example 223576 - set voltage to 223.576
- Enter the command $SV xxxxxx and click "Send" to get the saved calibration value
- NOTE - - volatile - value is lost, and replaced with default value VOLTS_FOR_Lx at boot