This is probably a dumb question but how do i properly size a single phase transformer with a 120/240v secondary that will feed a single phase panel with only 120v loads? Do I add up the wattage of each 120v circuit?

For example: I have one circuit on the A phase at 120 volts and pulls 16 amps which is 1920 watts. Then I have another 120 volt circuit on the B phase that pulls 4 amps which is 480 watts. So together this is 2400 watts. The next standard size transformer is 3000 watts. Is this the correct method?

I tried finding an example online but only found examples where the loads connected were the same voltage as the secondary of the transformer.

For example: I have one circuit on the A phase at 120 volts and pulls 16 amps which is 1920 watts. Then I have another 120 volt circuit on the B phase that pulls 4 amps which is 480 watts. So together this is 2400 watts. The next standard size transformer is 3000 watts. Is this the correct method?

I tried finding an example online but only found examples where the loads connected were the same voltage as the secondary of the transformer.

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