Hikermor — don’t toss that GZ Nomad 7 just yet. The testing I’ve done and will complete soon (I need to double check some numbers) show the Nomad 7 doing okay.
Goal Zero Nomad 7: USB: 4.64 volts, .95 amps = 4.41 watts — which is 63% of the number in its name, not bad at all and easily enough to charge a cellphone.

I’ll publish all the numbers later (maybe today).