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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.
If you want to charge phones or a laptop, it is easy to 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.