Simple Dashboard for Watt consumption

Hello dear community, I want to create a bar chart from a value in Prometheus for the last 7 days. Each day should display the total consumption of my variable “watt_usage.” I’m using Grafana 10.1, but I’m having trouble getting a bar to be displayed for each day. Can anyone help me with this?

I want to count this way:


but I got not a single result for a day. When I use table in grafana, I got sums for every 2 minutes