Last summer I built something similar to that Goal Zero unit, but it had a Lifeline GPL-31XT as the battery, 125AH group 31 AGM.
It also had a 45 amp PD9245 converter/ charger contained within
a 400 watt pure sine wave inverter
2 12v outputs
2 USB 2.1 amp output
Ammeter displaying only charging amperage
Voltmeter
Wattmeter for counting/measuring loads taken from battery
Extra 12v connectors in 45amp and 125 amp for flavors for solar input or jumpercable output
I ran 2 gauge cable about 12.5 feet to the intended vehicle's alternator, through a Manual blueseas 6007m Switch and a large burly 500 amp winch connector.
This battery when depleted to 50%, was able to suck 100+ amps from the alternator when cold, and 86 amps when hot, maxing out the alternator at 220F.
The PD9245's voltage settings and ~40 amps is a good match for the single Lifeline AGM battery, with 4 hours of 14.4v at the push of a button, or 13.8, or 13.2v. One can simply plug it into any household outlet and get a full charge in 5 to 8 hours. Or unplug it whenever the ammeter dropped to zero which might take much longer if many cycles were seen without adequate recharging, like any battery.
The 400 watt inverter, maxed out at about 35 amps. I ran all loads through through the Wattmeter which was modified with 8awg cable to pass 40amps continuous. The watt meter will count upto 64amp hours which is about 50% on this battery.
Parts alone were close to 1300$
This resides securely behind the driver's seat in a ram powerwagon and can power his ARB 50 quart fridge for 4 days easily in 75 ambient averages.
I need to get him some Solar to plug into it, 120 watts minimum, I'll push 240 if I can.
It is quite a capable and portable powerpack, would blow away that goal zero unit in performance and battery longevity.
Getting all these components inside wired properly, thickly and getting all components to fit was quite a challenge. The front face comes off in two pieces and the top has a hinge across the right side for access to fuse block from above.
It was in the 100 to 110 Lb range