We carry a 400w Xantrex inverter. Use it for charging small 110V only things like shaver, tooth brush, camera, etc. It draws about 1-2 amps with no load. The 1500w built-in Xantrex in our old motorhome drew about 7-8 amps with no load.
Plus I can carry it in the Jeep to recharge the camera, etc. during the day and on trails.
I don't know about 10x faster, but there is a loss factor when using an inverter. Most are around 80% efficient, meaning there is a 20% loss. Larger inverters usually have a fan also that has additional draw.