I would tend to agree that the likely culprit is interference from the solar inverter(s). One way to minimize the problem is a directional antenna. This helps in two ways, the direct signal from the TV station is amplified by the gain of the antenna and the interference is reduced when the antenna is aimed away from the solar panels and/or the wiring.
Take a look at this option:
http://www.mcmelectronics.com/produc...-2475-/30-2475
It claims 12 db gain, but that's really a bit under 10 db referenced to the C2V dipole. Next is the reduced antenna response in the direction of your panels. It might be around 10 db, yielding a net improvement of 20 db. The antenna would be coupled to your UHF section of the C2V with the existing dipole coupler.
The directional antenna would also help if the problem was interference from another source or even ghosting due to multipath.