Howdy, I bought the Anker 20000 and a Blue panel, as well s the fist full of extra cords. The big kicker is- the Big Blue does not charge the Anker 20000. It only charges from the wall according to customer service: — — — — –[#61333951]– — — — — Dear Bill Bateman, Thank you for your email. PowerCore Essential 20000 PD charges via a Power Delivery wall charger such as an Apple 18W/61W/87W USB-C wall charger or Nintendo Switch wall charger, and of course Anker PD wall chargers. With a non-PD wall charger, it charges very slow. While the power supply of a solar panel is even smaller than a non-PD wall charger, what’s more, the supply is not steady. Therefore, the solar panel cannot charge the PowerCore Essential 20000 PD. Please charge the PowerCore with a PD wall charger. If you don’t have one, I recommend the Anker 30W 2 Port Fast Charger with 18W USB C Power Adapter, Foldable PowerPort PD 2 ( Amazon ASIN: B07GWQ2GJC). If you should have any further questions or concerns, please simply reply to this email to get our speedy hassle-free support. Regards, Jane Ticket#61333951 AnkerDirect Customer Support It might be a good time to update the products and clarify the system capabilities. Thanks Bill