If the package system cost $300, then my calculations would need to come close to bearing out $300 'less' of generator run-time cost, which is basically the additional FUEL.
Not having the noise of a generator every time I want power: PRICELESS
Not having to lug fuel around: ALSO PRICELESS
Being able to hear those birds (and letting your neighbors hear those birds or whatever): etc
Personally I don't like those temporary solar rigs, like most people my first solar install was like that, and I found it much easier and more efficient to just to keep it on the roof. Hell, the roof is where I'd carry them anyway. And I'm on the NorCal coast where a little sun on the roof is welcome. If shading was a big issue I'd probably keep extra panels for off vehicle installation when needed since they're so cheap.
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