Got the 1st Gen Aeon Labs whole house energy meter for $9.99. It reports total kWh used (increments) as well as current Wattage being used (fluctuates).
Using Core setup 2 Pistons:
Using Capability: Power Meter (not Energy Meter)
- Drops below 25W send Power Outage alert
- Raises Above 25W send Power Back Up alert
Or Without Core, use Energy Alert SmartApp:
Go into Marketplace --> SmartApps --> Energy Management --> Energy Alerts
Setup an Power Outage Alert for when it Reports Below 25W and when it Reports Above 25W.
This meter can run on batteries or AC power. It will report every 5 minutes on AC power and every 10 minutes on battery power. It will transition to battery power if it loses AC power. The caveat is that once it transitions from AC power to battery power, it won’t go back to AC power unless you pull the batteries. So when you first set it up and add it to Z-Wave network, you need to use AC power only, then with it still plugged in, you can add batteries. After you lose power, and power comes back on, you’ll need to pull a battery and put it back in to force it to go back to AC power. You’ll obviously need to use batteries in order for your energy meter to be powered when you lose power. You’ll also need to have your internet router and cable modem be on battery backup (UPS) in order for the notification to be sent out.
If you lose power, it can take up to 10 minutes to get a notification.
Edit: It may actually convert back to AC power when it comes back up. It goes back to reporting every 5 minutes but the light doesn’t come on.