Maybe I'm in the minority here but in most of the shops I've worked in over the decades where the IT dept did a lot of programming most of the folks did both dev and ops although nobody called it devops back then. A pure-sysadmin in a large organization is basically a computer janitor. Without some dev skills you're not going to be able to automate anything hence you're going to be reduced to doing the chump work that somebody with dev skills has already automated. Literally "I will replace you with a small shell script" sort of stuff. So I don't know if devops is meaningless bullshit but I certainly don't think it's anything new or buzzworthy.
As a software dev I have no problem whatsoever doing ops as long as I'm never on call.
Many appliances run just fine on 120v DC power. Of course it's hard to tell which ones without either taking it apart and examining it or trying it and risking the magic smoke coming out.
Nothing high-current will ever switch to low voltage DC, I hope. I'm already annoyed at my 120v electric lawn mower; stupid extension cord is way heavier than my in-laws 240v electric lawn mower in Europe. Considering the cost of copper we should be switching to higher voltages, not lower.
Seems like the batteries could be redesigned to be higher voltage to reduce inverter losses. Just add more cells.
True sine wave IGBT converters are pretty efficient.
Backed up the system lately?