Adding a Home Battery to WoowTech
A household battery lets you bank electricity for later — soaking up surplus solar during the day, or charging from the grid while rates are cheap, then drawing on it when you'd otherwise pay more. WoowTech can keep an eye on every kilowatt-hour moving in and out of that pack.
Sources of Battery Data
Before WoowTech can chart the flow, it needs a feed reporting how much energy is charging into or discharging out of the battery. A couple of common paths exist.
Straight From the Battery's Own API
Several battery makers ship an interface that WoowTech can connect to directly. The Tesla Powerwall integration is a well-known example — once linked, charge and discharge figures arrive without any extra sensors.
Measuring With a CT Clamp
If your battery doesn't expose its own data, a current transformer (CT) clamp can do the job. It reads the magnetic field around a live wire to estimate the current passing through, which WoowTech converts into energy. Both ready-made and DIY clamps are supported.
Packaged route
- The Shelly EM is the simplest choice: it has a local API, sends updates straight to WoowTech, and comes with a polished integration.
Build-your-own route
- ESPHome can read a CT clamp current input or a dedicated metering chip such as the ATM90E32 — digiblur's video covers a typical build.
- On a Raspberry Pi, LeChacal's RPICT HATs stack to monitor several circuits at once, cover single- and three-phase setups, and feed WoowTech over MQTT.
Installing a CT clamp means opening up your electrical panel. Leave it to someone who knows mains wiring; in some jurisdictions a licensed electrician is required by law.
Adding a Home Battery to WoowTech
A household battery lets you bank electricity for later — soaking up surplus solar during the day, or charging from the grid while rates are cheap, then drawing on it when you'd otherwise pay more. WoowTech can keep an eye on every kilowatt-hour moving in and out of that pack.
Sources of Battery Data
Before WoowTech can chart the flow, it needs a feed reporting how much energy is charging into or discharging out of the battery. A couple of common paths exist.
Straight From the Battery's Own API
Several battery makers ship an interface that WoowTech can connect to directly. The Tesla Powerwall integration is a well-known example — once linked, charge and discharge figures arrive without any extra sensors.
Measuring With a CT Clamp
If your battery doesn't expose its own data, a current transformer (CT) clamp can do the job. It reads the magnetic field around a live wire to estimate the current passing through, which WoowTech converts into energy. Both ready-made and DIY clamps are supported.
Packaged route
- The Shelly EM is the simplest choice: it has a local API, sends updates straight to WoowTech, and comes with a polished integration.
Build-your-own route
- ESPHome can read a CT clamp current input or a dedicated metering chip such as the ATM90E32 — digiblur's video covers a typical build.
- On a Raspberry Pi, LeChacal's RPICT HATs stack to monitor several circuits at once, cover single- and three-phase setups, and feed WoowTech over MQTT.
Installing a CT clamp means opening up your electrical panel. Leave it to someone who knows mains wiring; in some jurisdictions a licensed electrician is required by law.
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