Avoid connecting a 120-volt battery array. Get some golf cart batteries from a discount store (e.g., Sam’s Club). Connect them, 2 in series and the rest in parallel for 12 volts. There are many inverters that work from 12 volts to get your 120-volt AC output.
On PV solar modules, there’s at least one vendor that will ship 140-watt modules by UPS and low-cost, MPPT charge controllers to connect between the modules and batteries. A little study can go a long way helping to build a good, little PV solar system.
If you’re acquainted with basic electronics or electrical work, get a copy of the NEC. If not, get acquainted. Install the system completely independent and unconnected to the power grid, unless you plan to install a transfer switch.
If you don’t know anything about electrical work or code, buy one of the 45-watt Harbor Freight solar chargers (more expensive per watt but safer than trying to build a system without electronic/electrical experience). Be careful working with batteries and make sure that they’re vented at the top if enclosed for cold climate (cables through the bottom of the box, small vents at the top for hydrogen gassing).
Some of the online vendors have quite a bit of educational information for customers.
I’m set up for 12V DC. Inverters to get to 120-120V AC. AC Circuits separated and well grounded.