According to my calculations (which are probably not accurate):
Given: 350 watt panels, quantity 24 panels, roof mounted at 35 deg, no shading problems (trees):
Average monthly generation is 1034 Kwh/month.
PV generation maximum of 1483 Kwh for June, and a low of 692 Kwh in Nov - with the remainder of the months in-between.
With winter rates of $0.09/kwh, I'd expect about $65-100 savings per month.
Summer rates of $0.12/kwh, I'd expect about $150 savings per month.
This is all based on best-fit calculations, based on real-world PV outputs.
I'd strongly ask the contractor to get you real output generation data (2-3 years) for similar sized systems.
That would be the best comparison for expectations and KWH savings.
Best of luck.
Given: 350 watt panels, quantity 24 panels, roof mounted at 35 deg, no shading problems (trees):
Average monthly generation is 1034 Kwh/month.
PV generation maximum of 1483 Kwh for June, and a low of 692 Kwh in Nov - with the remainder of the months in-between.
With winter rates of $0.09/kwh, I'd expect about $65-100 savings per month.
Summer rates of $0.12/kwh, I'd expect about $150 savings per month.
This is all based on best-fit calculations, based on real-world PV outputs.
I'd strongly ask the contractor to get you real output generation data (2-3 years) for similar sized systems.
That would be the best comparison for expectations and KWH savings.
Best of luck.