To completely power everything you would need a 12KW generator. However in an emergency you can live with a 5.5KW generator. You will not however be able to run an electric oven at all. To run an electric water heater almost everything else will have to be shut off. You will have to ration the power.
Depends on the wire size you are using. If the generator breaker is a 30 amp then install a 30 amp breaker.
It is a slang terminology for a connection to a 15 amp receptacle
A minimum of 4000 watts will get you by.
Generators are rated in watts or kilowatts. The formula for watts is W = Amps x Volts. To size a generator for the welder the voltage of the machine must be stated.
Take the power output of the generator and divide it by the voltage output. I = W/E.
No, you need a 30 amp breaker (whether that's from a generator or not it doesn't matter) with the proper voltage.
Yes, you can use up to 25 amps on a 3,000 watt generator.
You replace the generator with a larger one. A 20 amp generator can not produce 30 amps without being overloaded.
When you refer to a 200 amp welder you are talking about the output side of the welder. What you have to do is find out what the input voltage and current of the welder is to calculate the size of a generator needed to operate the welder.
Power = E I25,000 = 105 II = 25,000 / 105 = 238.1 Amp
You should never hook a generator to any house outlet, no matter the current. I assume you are looking for a quick and dirty way to connect a generator to your house in a power outage situation. This should only be done through an approved disconnect switch.
Go to this site http://www.generatorjoe.net/html/nemaplugs.html and tell me what configurations you have and I might be able to help you.