Is it feasible to change two 240v 10 amp outlets on your 5.5 kva generator to two 15 amp outlets?

Probably not. So long as you do not draw more than 5.5 kva at any one time, or 22.9 amps at 240v, the actual generator, that is, the part of your equipment that actually produces electricity, can handle about anything. But your generator is probably wired such that it cannot safely provide 15 amps to any one outlet.

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This question was asked twice and answered by different people. The answer Redbeard gave on the other entry is as follows:

Since it's your generator, you can do as you please; HOWEVER...

you should understand that the 10 amp breakers that were installed when you received the generator are there to protect the generator from damage. The larger capacity breakers could result in damage to the generator.

Two 15 amp circuits at 240 volts can pull up to 7.2 KVA from a 5.5 KVA generator... which will destroy it.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.