Hymera Fuel Cell
The BOC Hymeria is a PEM fuel cell that uses compressed hydrogen to produce power. Unlike other fuel cells that require an external battery, this unit is a complete standalone "generator". Simply connect a hydrogen cylinder, switch on, and you'll have instant access to 150W of power.
The unit has a built in inverter that allows you to connect mains powered devices directly to the fuel cell. There is also a 12v outlet for low voltage applications such as LED lighting.
Hydrogen cylinders are available to rent from BOC.