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I have a LOT of reservations about today’s “ordinary” American (ie - technical numbskulls and TV-educated dimwits) homeowners mixing up the insides of their homes, garages and basements with high-amp DC sources, lead-acid batteries, DC “welding” leads (at 100+ amps) and H2 emitting sources....

Accidents will happen - and those not back & life scarring will be deadly.

Well, that's why I leave stuff like that in my home to the pros. I value the safety of my family too much to be messing around with things like NG lines, wiring, and even "simple" stuff like chimney repairs. I know the value of training and understanding the safety implications of technology. I'm not "afraid" of the technology, but I respect it, and understand the limitations of my own abilities.

In my employment almost every day I am working with radiation sources (some in the kilocurie range), and generating millions of watts of nuclear energy. But I am able to do that work safely because I have training and education in the relevant fields of study. I have going on 30 years of experience. I can do those things because I understand them with an in-depth knowledge that allows me to work safely with the technology. Not everyone does. I guess the one thing I have gained from being relatively educated is an appreciation for how much I don't know, and the best ways to manage my lack of knowledge when it comes to practical problems. And not everyone can work with high current circuits, or make safe connections to the grid, or deal with explosive gases. I know I can't, so I don't even try. Better to pay people who know.

I wouldn’t assume this is equipment that most would undertake installing themselves. Heck, most people call for a handyman for even the most minor stuff.

In most homes you’ll find things like oil tanks filled with a couple hundred gallons of diesel, gas or oil-fired furnaces blasting away, wood stoves, plenty of electrical hazards — the vast majority of people manage OK. And then some do stupid things.