Submitted by leotil on September 15, 2017
I wonder if anyone here has the same issue:
I have Tesla Powerwall-2, solar panels and inverter from Solar Edge since 7 August on the Big Island of Hawaii. The system is working great. However I noticed an odd behavior of the system in the following situation:
In the morning the battery is usually over 60% full. The panels produce more power then the house needs and the surplus power goes to charge the battery (our system does not export surplus power to the grid).
However at the same time the systems pulls 100-150 watt from the grid that in accordance to the Tesla app graphic goes to the house and the battery. This odd behavior continues until battery is charged 100%. At that moment the system stops pulling power from grid.
In the afternoon, when the panels start producing less power and the house starts using additional power from the battery, the system starts pulling 100-150 watt from the grid again, until dark when panels stop producing. At that moment the system stops pulling that power from grid and uses only the battery again. Our average consumption during the day is 500-1500 watt per hour and at night approx. 80 w/h.
Why would the system use grid at times when there is a lot more power produced by the panels than we consume?
This behavior pattern is repeating day after day. which I can see on the app graphic.
I called Tesla and the technical support agreed that this behavior is odd. They promised me to look at it and try to find the fix. However, the support person told me that because my Powerwall is working this issue is not a high priority. They said they will contact me when they will have an answer to this problem.