What’s your monthly electric bill? $75 or $100? A $15,000 system has a 150 month payback (without considering the time value of money) - or more than 12 years. More if the panels can’t provide 100% of your power.
How long do the batteries last? Didn’t even consider the source of the batteries or the cobalt in the batteries (you can google where cobalt is mined)
How is your roof? Do you need to replace now?
I assume they can withstand hurricane winds? Did you talk to your homeowner’s insurer?
As TInker said, make sure you OWN the system.
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