Has anyone on here got experience with the benefits of solar panels and batteries etc..?

Reason I'm asking, is we had someone out to price up a job for us. 10 Panels and a 6kwh (I think) battery, which comes in around £11,500. Now the energy saving trust are offering £11,000 in an interest free loan, which is repayable over 10 years, so £92 a month.

What I'm trying to figure out, is will my bills drop by enough to cover that £92 a month, or am I going to have to cover the difference somewhere?