You seem to be laboring under the idea that said solar panels are not outputting power. A quick check online shows that the degradation of panels is from 100% to 75% over twenty-five years, not to zero watts.
Sounds like you own a Solar boondoggle home.
Home seekers, ask the real estate agent to remove that Solar monstrosity on the roof first. lol
It is more than 25% loss. If a car drove 25% less distance, would you buy it?