[David]

1.7-3.9 %, a modified Sine wave inverter is around 25%. Most generators from big box stores run 10% at a 50% load. What is the distance from your HF rig to the power supply? Have a Zantrex (Pro-Watt) power inverter purchased in 2005 rated as one of the best NOT! If you get within 20 feet of the beast with a portable AM radio all you hear is BUZZ. If I run a 50 foot ext cord a tube radio radio on AM is happy. Run my 2 meter rig using a very old Aston power supply with a heavy transformer hope I never drop that thing on my foot . David