Mini graph card max value per day

Configuration Frontend
1 
title: test

panel: true
cards:
  - type: custom:mini-graph-card
    entities:
     - sensor.balance_daily_power
    aggregate_func: max
    group_by: date
    hours_to_show: 168
    show:
      graph: bar

With this I get the minimum value per day. The minimum value is a negative value while the max value is positive. What am I doing wrong ?

2

Did you ever solve this? I have the same issue.

3

No, I did not. It seems that it has to do something with the way the values and their timestamps are stored, Used timestamp is UTC.