i had access to industrial power meters designed to 120A 400V so that is what i used, but the typical household here would not go over 4-7 kw and you can buy ch

i had access to industrial power meters designed to 120A 400V so that is what i used, but the typical household here would not go over 4-7 kw and you can buy cheap digital meters from AliExpress with display and so on they can measure up to 4kw i believe.