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Getting started it easy; it doesn't require money, skills, or fancy equipment.
It doesn't take much to get started. There are a few reasons for this:
You are suddenly homeless, are outrunning a hurricane, etc.
Some cars have USB outlets that are powered when the vehicle is not turned on. Others require the key to be in the accessory position, which can quickly drain the starter battery.
The cheapest way to have a bit of power for charging and running USB loads is with a small/handheld power bank. They are small, charged from USB outlet, and can usually charge a phone or run something tiny like a personal fan.
If you want to charge phones or a laptop without the ignition on, you can pick up a lithium "power station" and charge it when you stop for a sit-down meal, coffee, or anywhere else with an electrical receptical. This type of unit charges very well from an outlet, ok from solar, and poorly from a ciggy lighter socket unless you are driving.
A backpack and extension cord come in handy for smaller units; you can put the battery in the backpack and run the extension plug to the wall. No one needs to know you are charging a pack.
Larger units will be able to power CPAP and similar devices.
In Blue Highway, the author described his functional gear like this:
I had what I needed for now, much of it stowed under the wooden bunk:
In modern terms this might be:
1 sleeping bag and blanket;
1 Coleman cooler…;
1 Rubbermaid basin and a plastic gallon jug (the sink);
1 Sears, Roebuck portable toilet;
1 Optimus 8R white gas cook stove (hardly bigger than a can of beans);
1 knapsack of utensils, a pot, a skillet;
1 U.S. Navy seabag of clothes;
1 tool kit…