Aren’t there some in the 175 watt range? 350 is a lot of overhead, not that the efficiency is likely to suffer much. But it’s more than you’d want to pull from a lighter socket.
I have one (have had it for years) that's in the 40 watt range. It's been surprisingly practical.
I suggested 300 to 350 because it's a good universally useful size that is offered at a good discount these days.
You can use your inverter and a 12V source for a variety of things, including operating your laptop, a string of low-wattage lamps, or even small appliances. Plus, they cost little more than dedicated inverters in lower wattage ranges.
If you're the type who keeps an emergency battery charging battery in your trunk, adding a pound or two for AC electricity anywhere seems sensible.
Wow! Looks like I missed the excitement. Had some excitement of my own today...the cops knocked on my door with hands on guns...my “friend” had called them to see if they could get his stuff for him...I said no and they went away.
Now I’m just waiting for the locksmith to re-key the front door...