For an example, I can get 1kW of DIY solar cells with tabs, solder and flux for $260.
1KW WHOLE 3x6 Solar Cells DIY KIT TAB Wire, BUS, FLUX | eBay
That's 26¢ per watt. A 6kW system would cost only $1,560. Now when compared to a $5,000 5,000W generator, that's not bad at all!
Of course that price could go up drastically depending on what I use to make the panels or of. And I'd want to make them as light and thin as possible. And then have a way to easily set them up.
Another option would be 22-21% efficient Maxeon cells. But those would be closer to $1 per watt, not including solder and such and seem hard to get in large quantities.
100 Pcs A Grade 21% Sunpower Solar Cells 5x5 Maxeon C60 For Flexible Solar Panel | eBay