I have the same problem and still not figured out a proper workaround for this, though I know it is the active PFC on the PSU causing harmonic conflict with the Inverter. I messaged the Corsair guys and they said my inverter is not pure sine wave and hence the problem. Well, I have an Exide brand which says it is pure sine wave. So I checked out with other brand pure sine wave inverters of my friends' which included Luminous and Amaron... still the problem persists. I swapped this Corsair PSU with an old Cooler Master non-PFC PSU and the problem stopped. Please somebody let us know if they found out a proper solution for this as a good branded non-active PFC PSU is very rare to find nowadays.