You need a much bigger solar panel and consider bigger or multiple Powercore.
I don't know if the 10000 PD will not work, it's just less likely to work as it has to receive a special type of negotiation signal.
A way to test, is if someone who owns the 10000 PD now can connect it to a low wattage non-PD outlets, say one of the lower spec iphone chargers, or say just a regular Powerport, just ensure its not PD, and see if the 10000 PD will take a charge. It might.....
So here's some example:
- 21W solar panel, assume it will output 10W, or 2A 5V, so it would take 5 hours roughly to mostly recharge 10Ah.
- over 5 hours you would have to keep aligning it with the sun.
- the challenge with a smaller battery is the trickle charge period is largely wasted time, it will slow its intake once at 85% so even if you have good sunshine, that last 15% (1500mAh) is going to take 2 hours, so you spent 4.25 hours to get to 8500mAh and then 2 hours to get to 10000, vs if say you had a 20000mAh, it would be holding more actual stored energy in that say 6.25hours as it never got to the trickle charge.
So a bigger solar panel to charge faster and bigger batteries to go with as much stored energy possible and to make the most effective use of any good sunshine periods.
The buck-boost conversion electronics will reduce current, to increase voltage to around 5V so in less than ideal conditions at 10W solar panel may not output any power to the satisfaction of your Powercore, i.e. it could be literally useless. A bigger panel will be less useless, more likely to work.
I own the Anker 21W panel and the Choetech 19W. Anker stop making their solar panels. I did successfully use the Powercore 10000 with the Choetech, and I am skeptical the 10000PD will work with anything which is not PD. I did a 4 day off-grid in July, worked ok, but I did a 3 week off-grid in September and it was cloudier/wetter and I didn't get good solar input so I had to use pub sockets, and I wished I'd instead brought a bigger faster recharging Powercore to make use of the 2-3 hours I could use near a pub socket.