I use this inverter here:
https://www.harborfreight.com/750-wa...ter-66817.html

Nice and compact plus far more quiet than gasonline generators... I'll run a 25' extension cord from the inverter to the bed of my truck to power my supply/charger setup.

Only catch is that I need to start my automobile once every couple of hours for about 15-20 minutes to keep the main battery fully charged... first time I used it, I needed a jump start after 8 hours of sustained use.