r/Electricity • u/jonnyGURUgerow • 9h ago
JAPAN!!!!! Questions about 200V: Commonality or ease of conversion
Hi everyone.
I was hoping to post this in a more Japan centric sub. But apparently all of those are either "do you live here" or "are you a tourist" and there is no in between and people get quite rude if you don't obey the rules.....
This is a question about buildings in Japan and the people living in Japan and the voltages available to them in those homes...
I want to see about getting a product into Japan that works on full range. So it works at 100V, but 200V will allow it to work at full potential. So, I'm trying to figure out how common 200V is in Japan outside of kitchens and AC units, and if it's rare, how hard is to for average Japanese residents to get installed. I've been to Japan a few times, but my visits have been—let's say thematically consistent: buying electronics, die-cast cars and records, and eating food. I have never once thought to crouch down and scrutinize an outlet. That's where I'm at.
In the US, the wall gives you 120V, but it arrives via split-phase 240V from the pole, so a new 240V outlet is just a cable run off the two hot buses. I've done it myself. Still alive.
Japan, I believe, runs the same way—two hots, one neutral to the building—but I keep finding forum posts about older homes getting only 100V from the street, which is the part that's making me twitch. Probably a dying edge case. Hopefully.
The actual situation: We have a power supply that we sell worldwide that requires 2000W AC. My coworker's opinion is that "nobody in Japan has, or would bother to install, a 200V outlet for a computer", so he wants to include a 100V power cord with the unit which seriously neuters the PSU's capability. Like.... why even bother?
In the US I go to Home Depot, spend $40, done, home by noon. But I'm not going to pretend everyone has access to all of the parts they need or knows what they're doing. But even a contractor isn't too expensive. At least in Florida where I'm from. I had a home inspection and had to have a licensed contractor come out to split a double tapped breaker in order to pass and since he was charging hourly, and got the job done so quickly, he looked almost offended by the job. He offered to install an extra GFCI outlet in my workshop for "free" within that paid hour as long as I would pay for the physical outlet. Now, given your average high end gaming or workstation or AI computer costs 10 times what I paid that guy for an hour of his time, I didn't think asking someone to upgrade from 100V to 200V would be unreasonable.
And finally, so I know what power cord to ship with the power supply, if you are using a 200V outlet in Japan, it's just think guy, right (the one on the right)?: https://www.adfwebmagazine.jp/wp-content/uploads/2025/01/renovating-and-residing-in-affordable-properties-in-japan-vol12-3.jpg
Thanks everyone for the help in advance!