Not sure how much wattage you need, but I saw the Wagan elite PSW 400 watt model I own is now only 85$
It has powered a 435 watt load for a few minutes before I ended the test.
I've no idea the shape of the sine wave, or the voltage held under max load, but it is a very compact inverter, and I like it, and paid nearly double what it is now selling for.
The fan noise varies with the load, remaining off until about 150 watts or more at 75f ambient. I found a few transistors had no
thermal grease on their heatsinks. After I added some the fan would not come on until well over 200 watts. The thermal sensor for the fan, mounted on the transistor heatsinks, should have gotten hotter faster with the grease and turned on earlier and at a higher rpm, but the opposite occurred.
Anyway, I love the compact size and function.
https://www.amazon.com/Wagan-EL2601-Elite-400W-Inverter/dp/B007Y4BL1C
