2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric, 700 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.
Not many options except exclusion of the rodents from the wiring. If they can get at the wiring and are predisposed to gnaw on it, they will gnaw on it. Long ago, some PV panels could be purchased with conduit knockouts so they could be hard piped but in the quest to reduce prices and speed installation, I don't think they are currently available and if they are I expect its big premium to buy and install. Thus it comes down to attaching screening under along the sides of the panels attached to the underlying roofing. Difficult but possible with asphalt but I have no idea how someone would do to a tile roof. Outside the exclusion zone, metallic conduit.
Note, its not just rodents, on New Zealand's south island they have mountain parrots called Kea's. The juveniles gang up into groups and love to destroy stuff. I was there several years ago and saw discussion on how to Kea proof PV installations. They are big birds with strong beaks and they can rip window molding out of car.
The Internet is rife with testimonials extolling the olfactory power of fabric softener sheets to keep mice out of the house.
Reality: "Some smells repel mice for a short period
of time, like cigarette smoke and certain colognes," says Ron Harrison
of Orkin Pest Control in Atlanta. "But mice are extremely curious. A
strange odor isn't going to keep them away when they're looking for food
or a place to nest."
Bottom Line: Don't expect your box of Bounce to work
any pest-control miracles. But baited traps won't solve a mouse
problem, either. "Mice are attracted to spots where light comes through,
so if you see a gap where they're entering, stuff it with steel wool or
copper mesh so they can't gnaw their way through, then caulk over it so
no light can penetrate," Harrison says. Holes larger than an inch
should be sealed with drywall or another suitable material instead.