Hi,
The Honda 2000 is actually rated at 1,600 watts all the time, but 2,000 watts for short time.
Your '1500' watt microwave is the output rating, the input is a little higher.
Your battery charger / converter will always draw a little power. Up to 3 amps if you are dry camping and need to charge the batteries quickly, but less once the battery is over 2/3 full.
If you try running a 1,200 watt coffee maker and 850 watt toaster at the same time, it will overload the generator. You have to run them one at a time, and remember that the battery charger might be using 100 - 300 watts at the same time, depending on how low the battery is.
You might want to compare prices here.
Mayberrys.com They even package a pair of generators and a 30 amp RV cord, so that you can plug into two of the 47 pound portable generators and run the A/C unit as well as up to about 3,800 watts, about 32 amps at 120 volts.
By the way, someone reported that a 3000 watt generator is not powerful enough to start their air conditioners once it had been running on a hot day, cycled off, and tried to restart.
So you are probably better off with the pair of 'lightweight' 47 pound generators, and the cord to connect both of them together (so they load share), than a larger generator. My 4000 watt built in Onan generator is much more noise, so would a generator from Costco. While less expensive most air cooled portable generators are really noisy. The Honda 2000 is on of the quietest on the market, including specialty generators, such as those used my a movie studio to film nearby.
Good Luck,
Fred.