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IoTaWatt
IoTaWatt

IoTaWatt V6.4

Open-source 14-input energy monitor with an onboard web server and local history storage: readings stay on the device even with no cloud and no Home Assistant. Flexible CT inputs cover individual circuits, mains, and solar production with derived import/export outputs.

Works on integrations
IoTaWatt
Protocols
Wi-Fi
Roles it can fill
Energy Monitor
The core iotawatt integration polls the device’s local HTTP API over Wi-Fi: each CT input becomes a sensor, and IoTaWatt-side output formulas (net consumption, solar export) come through for the energy dashboard, though output sensors are typed by name rather than auto-discovered. The project is community-run: original sales have ended and current V6.4 hardware is manufactured on the original tooling and sold by CircuitIQ.

Where to buy

Buy at CircuitIQ

Recipes using this device

Energy · v1.0.0

High Energy Usage Alert

Installs a Home Assistant automation that watches your whole-home power draw and warns you when it stays high for longer than it should, so a heater or a forgotten appliance does not run all day unnoticed. Add speakers to hear it, add a smart plug to shed the load.

Recipes that can use it

These recipes are built around other hardware, and pick this device up as an optional extra.

Energy · v1.0.0

Solar Surplus EV Charging

Installs a Home Assistant automation that starts your EV charger when your solar array is producing a surplus and stops it when production drops, so the car pulls from the roof rather than the grid. Add a grid meter and a home battery and it holds back until they are happy too.

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