If there’s enough daylight you may be able to power a low draw piece of hardware directly from the solar panels. But its very low power output.
You cant run from solar > monkey > hardware
You have to charge the monkey first. Which in this weather with the solar panel is going to take ages. The powermonkey isnt great as a solar charger, but as a reserve battery pack (when you’ve remembered to charge it from the plug/usb first vinney lad!) its excellent.
You can of course charge your device direct from the power source that you’re using to charge the powermonkey instead.
What I mean is as long as you have the monkey adaptors with you and the monkey charger you dont have to use any proprietary chargers for your devices you can use the monkey charger and the adaptors. This is what I do – i take the adaptors a 3 pin block with USB output and the spooling USB to monkey pin cable. With that lot I can charge any of the three devices (using the two adaptors i need) without having to carry around the device chargers