I'm looking at a 2000w pure sine wave inverter and the prices are all over the map. Can anybody explain the difference between a $200 unit and a $1000 one? They all seem to have the same features...
You are discharging at the one hour rate or worse. This reduces capacity by half or more. The 220ah rating (20hr rate) becomes 50ah usable very quickly. Regardless of that... voltage will sag tremendously at these discharge rates and you will be very quickly flirting with low voltage shut down.
I recommend 400ah minimum for a 2000w inverter.
Compare here with capacity drop of US2200 (similar to T105)