I had a Wagan elite 400 watt PSW
inverter for a while.
Now, I have its internal heatsinks in a plastic bag somewhere along with everything else that might someday become retasked elsewhere. The circuit board and transistor legs appeared like they were dipped in brine, yet never came close to such abuse.
Lasted about two years with minimal use.
but when new it did supply 435 watts continuously for 15 minutes, I liked it for its small size, and the quiet fan at half load or less.
Got a hankering for a 2000 watt PSW inverter, but have no confidence in the usual lesser $$ brand names, and pockets not deep enough for those I would.