Gas is refined in just a few places in the US. Much easier for the Government to shut those down than all the electric. In any case, I have three sources of electricity; grid, generator, solar.
Haven't used my gas generator in 5 years. Other than an annual test run and servicing, it just sits there. Every outage we have had has been covered by my solar/battery/inverter setup.
I would emphasize the backup hardware. While it is nice to have tier 1 hardware (and i have a bit), even tier 1 kit fails. Sometimes by no fault of its own. If you spend everything one your primary gear and have nothing left over for "plan B", God help you when the unexpected happens. I went...
If you go through the learning process then build your own, you will have a better understanding of the system and will be better able to diagnose and fix things when they break. In an RV environment, something is always breaking. Isn't the definition of RVing: fixing you rig in beautiful new...
As a Samlex inverter user for two years, all I can say is I am impressed. As another poster said "built like a tank". Yes, Samlex costs more than tier two gear, but of all the things you don't want to fail, an inverter has got to be top of the list.
That is not how capitalism works. Look at Sony, they make as much as they can proprietary so you get locked into one vendor (them). Kind of the same for Google and Apple products. I would love it if you were right, but history tells a different story.
I built a 6.7 kwh system as a learning project when I took a year off for health reasons. My wife put up with my project but really saw no benefit to it...at the time. A year later and three major power outages (two being tropicalstorms) later and her opinion has changed. We do have a gas...
Often 100w panels just fit better on RV roofs that have A/C units, vents, other obstructions. Sure they are more expensive per watt, but it might be worth it if you can cram more solar surface area on the roof. YMMV.