Two Marstek Venus plug-in batteries, a set of solar panels and a smart meter, as measured in my own house. Each battery sits behind a Tapo smart plug, so the charge and discharge figures below are what the wall socket saw — losses and all. Home Assistant pushes a fresh snapshot to this page every 30 seconds.
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| Battery | Charged | Discharged | Round-trip |
|---|---|---|---|
| Meterkast | – | – | – |
| Werkkamer | – | – | – |
| Combined | – | – | – |
kWh at the socket, so the round-trip already includes the inverter and standby losses. Today's figure only settles once the batteries have given back what they took in — before the evening it reads low, because the difference is still sitting in them. That is why the headline above counts closed days instead.
| Over – | Energy | Share |
|---|---|---|
| Solar harvest | – | |
| Used at home | – | – |
| Exported to the grid | – | |
| Taken from the grid | – | |
| House consumption | – | |
| Into the batteries | – | |
| Out of the batteries | – | – |
Solar, import and export come from the P1 smart meter and the inverter; charge and discharge come from the Tapo plug in front of each battery. Used at home is the harvest minus whatever left through the meter, so a day on which the batteries soak up the midday peak scores higher than one on which they were already full. Round-trip compares a day's discharge with that same day's charge, which means it wobbles on days that start or end with a half-full battery and only settles down when you look at a longer stretch.
