This is a great idea
Electric vehicle owners who have ever been worried about potentially running out of charge in a remote location may be happy to hear that the OEM power solutions firm Phihong will be releasing a new portable 10 kilowatt (kW) DC charger for use with vehicles. The new portable charger will also be able to provide 3.5 kW backup AC power. Delivery to electric vehicles is at 12V or 24V, depending on needs
http://evobsession.com/phihong-reveals-10-kw-portable-ev-dc-charger-emergencies-remote-charging/
Electric vehicle owners who have ever been worried about potentially running out of charge in a remote location may be happy to hear that the OEM power solutions firm Phihong will be releasing a new portable 10 kilowatt (kW) DC charger for use with vehicles. The new portable charger will also be able to provide 3.5 kW backup AC power. Delivery to electric vehicles is at 12V or 24V, depending on needs
http://evobsession.com/phihong-reveals-10-kw-portable-ev-dc-charger-emergencies-remote-charging/