What size generator

typically you would add up the connected load in watts and size the generator to that with the exception that if you have a large central HVAC you wish to run you must size it for the generator to ride through the lock rotor condition that occurs. To find this look at name plate of unit for LRA (lock rotor amperes) and multiply x the operating voltage (usually 220 - 240). For instance a unit with 100A LR at 240V would require a generator of 100 x 240 or 24000W or 24 KW at a minimum

The size of a generator is determined from the horsepower or the coil itself. 1Hp is equal to 745.7 watts. So its either you are using the horsepower to determine the coil the engine can drive or you are using the coil to determine how many horsepower to drive it. They work side by side as a 1Hp engine can't drive a coil more than 745.7 watts, even when we know it even impossible to drive exactly the said watt(745.7 watts) due to power loss and other factors.

You don’t. You size a generator for the load. I only need an emergency generator for heat and lights and cooking and refrigeration.

What is the correct size generator for my home?

lights are a small load, heat in my case only requires enough to run the pump on the boiler. Cooking is an occasional load. Which could be done with propane. Fridge and freezer otherwise.

A standard home emergency generator of 5500 watts output is far more than sufficient.

That is how you size one.

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