Samsara supports the ability to create alerts based on Power level thresholds.
To configure a Power alert, click the Settings gear icon and then select the "Alerts" tab. Next, click on "Add Alert" and select "Power".
Here you can fill in the details around alert on if total power goes above or below a defined threshold as well as how long that condition must exist before triggering.
To add a schedule for the alert, select the 'Disable from' and 'Disable until' times and then click the '+' icon on the right. By default no schedule is used and alerts can trigger at any time.