Checking on my house electricity usage late this evening and noticed it was way, way higher than it should be. Quick scroll down showed that the OpenEVSE charger was dutifully filling my wife’s Zoe with electrons, when it is programmed only to do so between 00:30 and 04:30 i.e. the Octopus Go cheap period.
Logged into the charger straight away and saw that it had been charging for over two hours and the date / time was wrong. The car had been plugged in about two hours earlier than it had started.
Hit the button to reset date/time to NTP and charging stopped, as the time was now correct.
Any ideas as to what may have happened?
It’s an OpenEVSE bought and installed earlier this year, upgraded and been working with the ESP32 / latest firmware quite happily. We haven’t had a broadband outage (house has two DSL lines, one from BT and the other from Sky running through a Draytek router so we get 2x speed plus failover/redundancy) and the unit had WiFi (else I couldn’t have connected to it).
Of the 32A draw, just over 3kW was coming from the battery system I have so not all of the fill was at full cost but I’d like to try and find out the cause and stop it happening again. I’m guessing it rebooted for some reason and didn’t correct / fetch the time correctly. I’ve had it set to NTP since the board upgrade and it handled the DST transition faultlessly.
I know the unit was OK around 7pm as I had to take the recycling boxes down the road and the unit was sleeping, showing the charging period correctly and also the correct time.