"Also even on rainy days there is still enough filtered sunlight to generate some power and in full sun there is enough to keep the storage charged and to sell power back to the electric utility company.
So, with the energy savings, rebates, and excess power sales they will pay for themselves in 5 years."
I really really doubt 5 year payback. In a few years, there will be so much solar and wind that utilities will pay zero for any power you generate and want to sell to them during the day.
They’ll use their own solar farms first. there will be too much supply and not enough demand.
Between the panels and batteries those folks are probably into 30K plus. My electric bill runs $1500to $2000/yr. No way they’d pay back in five years.
t.