The Differences between Single-phase Inverter and Three-phase Inverter
First, you can check your switchboard. If the main switch is one-pole wide, then your home is connected to a single-phase power supply. If the main switch is 3 poles wide, you have 3-phase power. Alternatively, you can call your electricity provider and ask them about the power supply. Just keep a copy of your electricity bill handy.
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