is solar electric worth it

if i use 1480 kilowatts per month, and I can add a solar system that has 6, 170 watt% I'm going to save on e-bill?
The solar system has 6 to 170 watts of PV panels, 1020 peak power, wondered if anyone could tell me how much this will reduce my electricity bill, by example for 10, 20, 30% and worth the investment. the system has a 5 year warranty that was wondering how I could help save a month on electricity and also help lower global warming.
How much you save depends on many factors, including whether that bill is in energy levels (kWh at a cost of more specific reference), and where is its home. Among Arizona and Maine, can not be a 2:1 difference in energy harvested. Our house is San Jose, California. Our system is about 3 times the size of his, and our power consumption was 1 / 3 of his own, before we got panels. They produce almost all our electricity. So if your house was next to ours, moving a little over 10% of its energy with panels. Warning: I am suspicious of a system that only comes with 5 years warranty. The usual security system professionally installed is 20 years, with the groups that is justified by 25. Maybe after another question with a link to the current system, then people can give their opinion.