These solar panels are rated on their peak power, when the Sun is not obstructed and when the light is perpendicular to the panels. This may be achieved for about 15 minutes in the middle of summer, if the panels are perfectly oriented. Often this cannot be achieved at all.
A 10 kW panel will give you, on average, maybe 1 to 2 kW averaged over day and night (in other words, from 24 to 48 kWh.) Daytime in fall and winter is particularly short, and cloudy skies are the norm.
Of course this is also power, and you can use it - as long as you don't have to pay for it. If you do, though, you may be better off with a gasoline generator - especially because it works when you need it, and idles (or stops) when you don't use it. Modern generators with inverters are particularly effective, since they don't have to maintain the RPM to hold the frequency.
excellent summary....and to add, at the most the sun is available in NYC, 5 hours a day this time of the year....as always, what happens at night with solar power....zero...