I purchased a Harbor Freight 3500 inverter generator. I was using it to power audio and video equipment. I was running everything through a power conditioner. The volt meter on the power conditioner kept fluctuating up and down. My projector shut down several times because of uneven power supply. I ran projector direct into honda 2200 and worked fine. On the Harbor Freight generator when i use a two prong adapter the power smooths out and is steady. I am baffled any help is appreciated.