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I came up with another reason why using a 3k on 240 wired to the house might be a bad idea.
Load balancing.
In 120V only mode, you have 3kw of power through that one circuit.
In 120/240 mode, that 120V power is now separated into 2 1500 watt circuits.
So to use my example above with hair dryer and microwave, if they were the only things running you might be fine on 120V only. In 120/240, if you run them both and they are on the same feed circuit, you're now badly overloading one half of the generator wiring. Most people don't know what in the house feeds off which line in, so it's a decent chance you'll destroy something.
Unless you have 12.5 amp breakers installed for the generator feed, don't expect this overload to be caught. The breakers are just there to protect the wiring from being overloaded; the gen output in 240V mode is less amperage than your average household circuit (usually 15 or 20 amp).
Load balancing.
In 120V only mode, you have 3kw of power through that one circuit.
In 120/240 mode, that 120V power is now separated into 2 1500 watt circuits.
So to use my example above with hair dryer and microwave, if they were the only things running you might be fine on 120V only. In 120/240, if you run them both and they are on the same feed circuit, you're now badly overloading one half of the generator wiring. Most people don't know what in the house feeds off which line in, so it's a decent chance you'll destroy something.
Unless you have 12.5 amp breakers installed for the generator feed, don't expect this overload to be caught. The breakers are just there to protect the wiring from being overloaded; the gen output in 240V mode is less amperage than your average household circuit (usually 15 or 20 amp).