Quoted:
I have seen portable 1800 watt units selling for 1100 and up.
The wattage ratings of most "solar generators" are VERY misleading - almost to the point of being downright fraudulent.
While an ordinary engine-driven generator is capable of delivering its rated wattage indefinitely, most "solar generators" specify the maximum wattage capable of being supplied by the rechargeable battery - not the much smaller power output of the solar panel itself. The battery is only capable of delivering this power for a few minutes before it is completely discharged.
If you're serious about going solar, consider buying your own panels, batteries, charge controller and (optional) AC power inverter. For any given amount of money spent, you'll end up with a system that blows away most pre-packaged "solar generators".