EV Charging Station NS - Consistently Disconnecting Overnight

Hi There,

I’ve been wrestling with this issue for a long time, and I have run out of my own bright ideas.

I’m in an offgrid setup with some 16kw solar and a 28kwh battery. I’m using NodeRed to create 2 charging logics for day time charging to maximise solar usage, and overnight charging to maximise my home battery usage. (dependant on forecasted capacity to charge it the following day)

Essentially it calculates the available energy in the battery for charging, switches on when it considers it can get to sunrise without emptying the home battery below 25%, the controls the charging logic to target a 30% home battery SOC at sunrise.

What I am experiencing is that the charger disconnects/stops responding every night I try to charge the car. In my troubleshooting to date I have:

  1. I was experiencing rapid switching due to my logic, so I reduced the message frequency for the switching to 15 minutes
  2. Set it so it only submits a change in charger state
  3. Then changed the logic so it comes on, but will only turn off if the forecasted solar drops below a threshold (during summer this almost never happens)
  4. Adjusting the charge rate logic to try and keep it more stable so it doesn’t change as frequently

After stepping through all of this, I went to bed last night confident I had it sorted, only to see the same issue occur.

Looking at the log, I can see that it received a sole message to turn on, messages that swept it from 6A charge rate to a 15A charge rate (the max permissible given my coding) and stayed there until the charger stopped responding.

I’ve installed the latest firmware on the charger, and just getting fed up with trying to troubleshoot this.

In the most recent history, it seems that the EV Charger has disconnected at/around 50% home SOC. My shower thought this morning was that it was the battery SOC you can set that caused this problem, but ironically it is set at 70% (and I thought it was ignored when in Manual Mode?)

The attached image is what I see, it is showing the last status until it resets/I reset it.

There was a setting in my Quattro that switched off AC2 output when it dropped below 50% SOC. Fixed that and works a treat