How Do You Charge Your Solar Panels?

i just throw a large battery pack on the window sill, am with some long us pc cables, and nd charge them that way. And it works really well. How often do you have to charge them? Like, every six months or so? Yes, thats not seor often like it. It's maybe two to three times a year, a morofom showing off something. But i feel like ultimately i'm probably going to need them, because acoustics are big deal in this room,. The more i can deaden walls, the better. I mean, you might be better off, instead of getting curtains of just, a, you can get those sound dampening