BigBlue is currently crowdfunding its Cellpowa 2500 fast-charging power station on Kickstarter. The compact gadget has a LiFePO4 battery with a 5,000 W max output so that you can use it with larger devices such as coffee machines or TVs. The power source has 14 outlets and has pass-through charging capabilities.
https://www.notebookcheck.net/The-BigBlue-Cellpowa-2500-fast-charging-power-station-is-now-available-on-Kickstarter.614948.0.html