Which power bank should I choose for Anker 21W solar charger?

After reading many reviews I decided to get Anker PowerPort Solar 21W. Problem is I’ve heard that it may not be compatible with every power bank. What I mean is it charges fine and when cloud happens it can drop to 0.5 or even 0.25A which is still fine. Problem is after cloud passes charging is not resumed with full power.

What I’ve read PowerCore 20100 has this problem. I’d prefer two 10000mAh banks to avoid hardware failure problem during long hike. Does anyone have any experiences with that solar charger and some power banks?

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