The simple way to do it would be to put in a fuse block and power that with a pigtail that he can connect to the Jackery thing.
If he's considering a charge controller, though, he can get a much less expensive plain 12V LiFePo battery (100AH are only like $170 now) and put in a mini but normal setup. So then you would go:
Solar--> charge controller > bus bars > big fuse > battery. Separately you'd go : bus bars > fuse block > various accessories on separate circuits
Explorist.life and others have great guides for basic systems.
ride bikes, climb, ski, travel, cook, work to fund former, repeat.
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