@cate @mdione @float13 our soldering iron is something like 20W, basically irrelevant
and I don't have a welder, nor can use it (yet)
I suspect that the clothes iron isn't that much of a load either, at least once it's up to temperature, because it's rated 2.2 kW or something, but it's also on for very short periods of time, I should take some actual measurement
the same applies to the kettle: rated 2.2 kW, but for a tea it only stays on for a couple of minutes, so it's less than 100 Wh