The powerbank has 3 outputs: 5 volts at 2.4 amps, 5 volts at 2.1 amps, 5 volts at 1 amp. The RavPower RP-PB41 is older technology as it charges via a micro-USB connector at a maximum rate of 2.1 amps. Since this is for when-needed backup, the long charging time (12+ hours from fully discharged) isn't a concern.
I think I mentioned the battery-powered fan/light I got from Amazon to have a convenient source of light and limited cooling for short summer power outages. That unit will run on the lowest settings with a charger connected - including the 26.8AH RavPower powerbank. That ups the time for the fan and light to both be on from 14 hours to about 48 hours. I can charge both from the backup power system or I can use the solar panel with a 5 volt, 2 amp USB output. I think that combination was a good investment - even more so with all the "weather related" outages the past few days ;-)