Right off the bat: if your solar panel is underpowered during winter days, no amount of batteries can make up the shortage during night time.

It behooves you to ensure that winter solar power exceeds your usage before even to consider buying any batteries.

780kWh/month for 2,000sq 1970 Texas natural-gas ranch-sytle home in December. I would need 1400kWh just to be able to start charging batteries (which includes 780 daytime usage) so that all-night-long nighttime usage are still battery-available/supplied.

It gets worse during A/C usage months.

Battery-store power for residential are at best transient and temporary.

Public ones explode often.

I learned all this with homemade battery pack and windmill-powered generation in 1973. Solar cells were pricy then, 10 of those large-stamp-sized solar panel were $166 (in 1973 dollars) and still could not keep one red jumbo LED lit all night long.