The cheap solar setup I made uses a $30 charger and a $40 inverter. I already had 4 old lead-acid batteries in a scooter I didn't use and I'd previously bought the most expensive part; the panel.
All told, it took about another $100 worth of switches, cabling, conduit, etc. But now we generate 1.2kWH/day, can store 400WH, and can use up to 400W at a time. Not a lot, but my chest freezer uses ~800WH/day so once the system is proven I'll probably have it run that.
