Duracell 600 watt powerpack

600 watts may not be enough when the ignitor kicks in. And the real question is duration, how long will it run on one of those. I don't know the amp of an FEC100 with IQ4 (something near 5amps I think AFTER the ignitor is done), so you'll need that to determine how long this model will last.

Are you thinking competitions?

The simple solution is a deep cell Marine cycle and inverter. If you get a good inverter charger, that works wells.

Then you move up in price so square cine way inverters.

There are some posts in the contest forums.