How much would it cost upfront to install solar panels in my home and what could I save?

I’m curious what the average household spends to install solar panels in California. Also for those of you that have installed them, how much would you say you saved in the first year? The second?

Thank you for your time answering this.

How many solar panels does it take to run an A/C unit? Also, How many batteries in an array?

I was wondering how many 700 W solar panels it would take to run a household A/C unit. Also curious how many batteries it would take to keep A/C running in inhospitable environments. Would a 3500 W inverter be enough if it were to run 220 AC?