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If you live somewhere that's prone to flooding then having a waterproof bag for your gear might be a good idea. If bad weather is on the way, pop your precious gear inside a dry bag for safety.
I've used an Ortlieb dry bags to keep delicate electronics dry in some of the worst weather conditions and they've never failed me.
If your power needs go beyond what a solar charger can offer then you need to think bigger. If you have the space then a gasoline generator is idea, but you have to run this sort of thing outdoors because they are smelly and a fire hazard.
An alternative is a 12V inverter that you can run from your car battery to provide household power to run a range of devices. One of the best inverters out there is the Cobra CPI 2575 which can push out a whopping 2500W and is kitted out with a raft of safety features.
There's no point having all the kit if you don't know how to use it. I've seen people superglue their hand to their face, struggle for ages trying to start a gasoline generator that didn't have any gas in it, slice their hand open with a screwdriver, and set to work reading instructions while a storm approaches.
Don't be those people! Learn to you’re your kit in in comfort, when the lights are on and you have a favorite beverage close to hand. That way, using your kit will become second nature and you won't have to learn how to use it when you're cold, in the dark, or the floodwaters are rising.
Don't, whatever you do, just pack this stuff into a box or store it in the garage and not look at it until you need it! Use it. Practive your skills.