Very very simple....film the home on a cloudy day; the clouds will turn the sun into one nice big softbox. If the client will not wait for a cloudy day then wait until sunset or shoot at sunrise when the sun is low on the horizon. There is nothing that will get rid of glare for a shoot like that except working with the only light source you have...the sun.
I work with clients all the time on the proper time of day to capture their project in the best lighting. Sunrise and sunset golden hour is the best lighting anyway. Most solar panels face South to South West to capture the most sunlight possible, so in your situation if you cannot wait for a cloudy day, then sunset would be your next best choice to prevent dark shadows on the south side of the array which would occur if you tried to shoot the sunrise.
You can also use an Azimuth calculator if you want to get even more precise for the absolute best time to shoot the project.