If your generator was powerful enough to run your appliance you could theoretically do it with a step up voltage transformer. The linked device is just the first hit I got on google, I have no experience with that specific model.
Your generator is rated for 3000W continuous. That is a bit to low to run a 3000W appliance. Keep in mind that there will also be some loss in the voltage transformer if you use one. My recommendation is that you buy a higher rated generator that has a 240V output.
You aren’t SOL. There are two ways to solve it.
You can run new wire with a 240 outlet and two pole breaker (need to check specs on appliance to see what gauge wire and what amp breaker).
Or can you can get a step up transformer and plug it into your normal 115 outlet. Just make sure you know the wattage the appliance will need and size appropriately. My wife is from Europe and we had a euro dishwasher that I used in a rental with a step up (like This. In the house we own I got a euro outlet from Home Depot and wired it for 240.
Not feasible to modify heating and motor appliances. Computers and electronics usually just need an adaptor for the plug's prongs, but not in this case. The voltage is critical. The only way would be to have a big transformer.. and it would have to be very large since all of these appliances draw so much power. It would be best to get new appliances where possible, but if you really wanted to you could use this:
And that would allow you to run 2 heavy duty appliances safely at the same time.
I'm looking at this transformer
I've been googling as I go here and I believe you may have it figured out in regards to the ground.
Now I just have to see if what I am plugging in is going to care
Might be overkill at 5000w but this one will do it. Most likely to pop the power outlet circuit breaker befor blowing the fuse of the unit. As may power outlet breaker only hand up to 2000w
You can run it on 110v, but you need an up/down transformer....which technically makes it run on 220. Make sure to get one that's rated for at leas double the power that you need, as the wattage listed is max wattage and not continuous.
This the one I use. It's rated for 2500w continuous. Most people don't reccomend using them long term. I'm only planning to use it for about 2 weeks until I can get another 220v outlet wired.
ELC T-5000 5000-Watt Voltage Converter Transformer - Step Up/Down - 110V/220V - Circuit Breaker Protection https://www.amazon.com/dp/B00EBC5HSS/ref=cm_sw_r_cp_apa_Z8IAAbEABY5A1
Unfortunately she lives in an apartment. So I guess I'm going to have to get a 5000 watt transformer? Seems everyone recommends 1.25 to 1.5 times the max wattage of the item... so 2400 should be good on a 5000wat, with a 240 out output. Like this one? https://www.amazon.ca/ELC-T-5000-5000-Watt-Converter-Transformer/dp/B00EBC5HSS
So this is the transformer I'm looking at
The device has a Nema 6-20 plug so only 3 prong