OpenEVSE hardware version 5.5 and above supports variable relay power. The relay is closed at full power then after a set time the power is decreases. Differences in hardware and temperature can require slightly more hold power.

To alter the settings login to OpenEVSE WiFi

Click the System tab

Enable Developer Mode

Click the RAPI tab

Enter the command $Z0 xxx yyy

xxx = the number of ms to run 100% power

yyy = the power out of 255 (example 90/255 = 0.35 or 35% power)

Recommended setting is $Z0 100 90