It depends on how much equipment you plan to plug. You can try Omnicalculator's Ohm's Law Current tool or do as follows:
Determine all the power you require. Let's say 10,000 watts (refrigerators, microwave, hair dryer, among others).
Assuming your house provides 220 volts, divide the total power by the voltage as per current Ohm's law.
The result is 45.45 amperes.
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