well
my tripp-lite 1250 powerverter, has been running almost non stop for 6.5 yrs
it has only been off, during battery swap, rewire, or the RV was in the shop (engine work)
runs the fridge full time, the MW for a few minutes everyday (early morning and late night), sometimes makes a pot of coffee etc..
i have used it to power a circular saw, cut fire wood with electric chain saw, even power the vector battery charger to jump start somebody i could not get close enough to use jumper cables (facing wrong way in a parking spot)
extension cable from inverter to the vector with 90amp boost start