I'm thinking more along the lines of taking a couple of 200 watt panels camping with you,
or to some remote cabin site..
The idea here, is to use the
much cheaper grid-tie micro-inverters,
off-the-grid.
Or, maybe you have to do some light construction work, way out in the boondocks?
Haul out some 220 watt panels, a little power-box to hook up to your 12v truck battery,
connect up some panels and you could run small power tools and charge
up the rechargeable power tools on site. (If the sun stayed out).
Would not replace a gas generator, but might be good if you didn't need 5KW..
I'm pretty sure that PV is going to get a lot cheaper, pretty soon..