No, if the UL Rated Listing for the Panel is 200A than that's it. You cannot have 300A flowing through a 200A Panel.
A #16 copper conductor is not a wiring size that is used in homes. This is because the smallest breaker for residential use is rated for 15 amps. A #16 copper conductor is only rated at 13 amps. For a load of 13 amps over 100 feet a #12 copper would be required.
I am assuming by your description that the panel is protected by a 90 amp breaker and the breakers in the panel when added up is 200. This is okay as long as your 90 amp breaker trips on a regular basis. It is typical for the breakers to add up to more than the main breaker under the assumption that you would rarely be running each circuit at its maximum capacity.
Need to know the wattage to work out the amperage
Yes. You'll seldom run every circuit to full capacity. The main breaker will trip if all the individual circuits exceed the 200 amp rating of the main breaker.
The formula to use is I = W/E. Amps = 20000/240 = 83 amps. Check the nameplate of the equipment that you want to connect to the generator. You can add equipment up to the total of 20000 watts or 83 amps.
200
100 and 100 can add to 200 50, 50, 50, and 50 can add to 200 8 25s can add to 200 20 10s can add to 200
200
200
100 add 4.99 add 200 add 100 add 16 and add 3 is 423.99
Amps x volts equals watts...200 amps at 12 volts would be 2400 watts...add a few more because. the inverter efficiency is not 100 percent...
100+100=200 It is this because "and" means add or plus +.
300
The answer is 200 if you can't just multiply just on a piece of paper write down 100 + 100 and add it and you will get 200
sum just means add and 100 and 100 when added together is 200.
200+100+150=450
The answer is 200 if you can't just multiply just on a piece of paper write down 100 + 100 and add it and you will get 200