Good pickup, Zoltan.
I purchased and tried a Razormax 6000mAh portable charger today from BestBuy. It is billed as quick charge device with a 2.4A input and a 2.4A output. It did find running my Dreamcatcher off the portable charger at about 1 amp when plugged into the ac mains charging itself.
The problem I had, was when I pulled the plug on a running/charging system - - the portable charger did a quick shutdown then a restart. So my Dreamcatcher also rebooted and came back fine. That’s not what I’m looking for.
Maybe a device called a “battery bank” is the right answer. For now my 6000 mAh Solar Charger does the job without shutting down, but can’t keep up recharging what the Dreamcatcher draws. Ken