Goal Zero Yeti 400 just arrived. Basically a big arse battery for emergency power. Weighs about 13.kg! It has regular power outlets on the back, as well as USB and more, with enough juice to fuel just about anything but a refrigerator. My out-of-the-box impressions are very good: build quality seems excellent, design smart and clear.
Update a few weeks later: still impressed. I’ll probably be getting a couple more of these.