How clean? VERY, not as good as a true sine inverter, but likely cleaner than shore power.. I've never had an issue with my 5500
NOTE: If it has not been exercised in a while (Should run 1/2 hour every month under 1/2 or load. or more in both 1/2s) you might want to run it an hour or two with non-electronic loads as cleaning up the power is ONE of the things regular exercise accomplishes
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times