This can be much longer in the reasons / theory of the preps, but the serious multi-use ones that blend daily with prepping.

• 5kw solar, 15kwh battery, MPPT controller and things on scheduling / contingency rather than having a HUGE battery system. 48v is all around a good value to aim for, four 12v LiFePo4s can give more options when encountering 12-48 systems. Small system can take a huge chunk of normal times bill and work for you... but be a life line in SHFT. Good for home owners. Cost is high, but is something to aim for as you use electric....pay for electric.
• 1kwh-2kwh with 4kw+ surge power bank, portable enough to lift.... use with tools and 120v 12v, 5v things of all sorts, a 2kw backup suitcase inverter generator can offer a serious backup for how little they cost. Like... I'm confident going out in the woods with electric saws with it, or being able to power the house when combined with the battery systems. You use electric too much... like... seriously need to consider a small system. Ultra compact for what it can offer. $700 can get you covered if you hit the right sales for those two.
• Data, ... seriously. Learn how to download YouTube, or Torrent movies, apps, maps, books, manuals, games, ... offline webpages. The thing they never tell you... is how boring it can get.
• Communications, should be higher up... but you need to look at old and new tech both audio and text, ideally some form of data. There are many options here that should be explored, variety here is ideal.
• Deep freezers, seriously don't underestimate what storage they can do and how they can extend that sale you find. Multiple smaller over just one huge one so you can move them and have redundancy. Your power options can easily keep them running when you set it up right, the wattage is honestly quite low. $170 a 7ft3 will pay back quickly when hitting food sales.
• An efficient filtering dehumidifier or dehumidifier AC combo, ideally portable. Humidity enables mold, rust, rot, personal discomfort... this is a defense against those when there is really no other good way in certain environments. The electric cost is usually a fraction of what the damage would be to property otherwise.
• A small portable ventless heater, requires no electric and can save your house's plumbing from bursting in the depths of winter, not to mention take the edge off the cold. Again... a small one thats just enough to get by. This is a huge insurance that has saved my arse in the past. They're cheap for what they offer.
• Electric blankets, heavy house robes, slippers, indoor hat, sleep bag...etc. Allows you to get through a winter on a fraction of typical house heating, yet alone in an emergency. Either way... you'll be more comfy or at worst, alive.
• Zippo hand warmer on coleman camp fuel... underrated and cheap af to run.
• A 48v E-Bike can have immense savings when used for even local trips, not to mention the exercise you know should be doing but we're all mostly lazy, no registration, no insurance, reliable usually. 48v also matches the other 48v systems ideally if wanting to seriously extend range or combine battery use.
• Off the E-Bike or stand alone you should have a functional heavy trailer. It isn't just like you seeing people hauling their kids in... but its general cargo... and thats a pretty big deal even if you're slow with it. The wagon can also be used around the yard, and is hugely underrated force multiplier. We're all weak... and carrying things over distance sucks hard even for beefcake gym bros.
• An 18650 headlamp with power bank function, you NEED to see, ideally hands free in the dark. 18650s and 21700s are gold standard for capable lamps and power banks. I use both sizes a ton and is an absolute bargain for the current costs. Hell get two, they're that valuable when needing to see.
• Second pair of glasses, you already have trouble when you lose them waking up trying to find them... imagine not being able to find a backup pair.
• Reciprocating Saw Blade Handle. Lock a sawzall blade into it for the wood, metal / whatever you're cutting. Cheap, Underrated, small, can do a lotta work for what it is. honestly a step above a Diamond wire EDC saw. Many uses for its size...
• Stainless wire (Harbor Freight sells it in a 1# coil in a blue dispenser) add aircraft safety pliers... You have something with serious tie ability that beats most zip ties...and you can clamp hoses, make traps, use it as a conductor.... wire has a TON of uses if you're clever.
• Steel wire winch with 2+ snatch blocks. You can multiply to a dangerous amount of force by hand... insanely useful to even pull a vehicle out of a ditch. You need to be trained if you're unfimiliar with winches, but really, it is a force multiplier to move heavy things of all sorts. My personal favorite is ran with a hand drill on a 40-1 ratio worm gear winch.