Recharging the Hydrogen Fuel Cartridges could be a problem in an emergency.

I am currently using the following for outdoors power generation;

http://www.amazon.co.uk/New-Trent-iCarri...words=new+trent

http://www.amazon.co.uk/EasyAcc-charger-...=solar+panel+6w

http://www.amazon.co.uk/OUTDOOR-Powerpot...ywords=powerpot