Got a replacement adapter.
Made in China.

Will probably be reviving this thread in a couple of months.

Would it ever be practicable to hook up all these modern DC devices directly to solar panels on the roof? The way panels are configured at the moment, with an inverter needed to convert the current to AC, then an adapter to convert it back to DC, just seems so wasteful. Particularly as the inverter is probably made in China, so that's another part likely to wear out in six months.