I paid $50k for 24kWh nameplate capacity with no battery, fully installed and integrated, a year ago at 2% interest (the only reason it made sense to even do the deal). My electric bill went from an average of $350/mo to $16/mo (the minimum to stay connected), while the loan payment is ~$300. My cost for the materials alone would have been ~$30-35k (I needed higher power individual panels to get the capacity I needed, and went with a micro inverter setup for higher reliability). Equipment rental would have been another $3k because I had to dig a trench out to my detached garage to fit the entire system, and I don't own a 30 ft ladder to reach my roof. Electrical work has to be signed off on by a licensed electrician. Engineering schematics of the electrical system have to be created. Permits with the city have to be filed. Another $1-2k. For another $10k: I got to keep the week of vacation I would have needed to burn, someone else is responsible for fixing defects in the system, and I didn't have to spend the mental bandwidth on all the ins and outs of the whole shebang. The installers finished the system in a day, and had it turned on generating power after all the bureaucracy hurdles were cleared a few weeks in.

When I can afford it, the next project is add enough battery capacity to effectively go off grid.