So, I dug around a little, trying to find out more deets on the Anker Powerhouse hardware. A few points to call out. Out of the box, I think it'll need a little tweak to play nicely with solar kits.
The DC input is spec'd at 16-17V/6A, coming in over a round plug. I hope it's not *that* tight in actuality, as solar output tends to vary a bit. They didn't specify the size of the round plug, but one reviewer noted 7.5mm That 16-17V/6A range is a little narrow, but should still play nicely with a Renogy solar panel, cranking out 17V usable, on a bright day. You may need to roll your own round plug adapter, to get the solar output into their round plug receptacle (FYI, goal zero's plugs are standardized around 8mm round plugs, or Anderson Power Poles for their higher amp inputs). The 6A input is a little skimpy, so don't expect to throw tons more solar panels at this thing, in hopes of recharging faster. One 100W panel is about what this will be happy with.
Also, FYI, some dude who goes by the handle "SonarTech" did a teardown in the posted anker reviews of this thing. :D What caught my eye was that the battery is not user replaceable, and is basically integrated in such a way that this is basically a throw-away device, once one of the 32 internal batteries goes tits up. He did note outstandingly clean sine wave output from the inverter.