BruceM:
It’s a wearable project. For a hat. I was planning on mounting the battery under the bill of the hat. That’s why I wanted a flat Battery
You should have told us this in the first place. So I presume your LiPo battery is also going to be of small size so small capacity. While it is ok to charge small capacity LiPo cells at 60mA provided by the solar panels, just make sure you do not plug those TP4056 modules into a USB socket before you change the charge current resistor on the board because by default the resistor placed in the TP4056 board lets the board to charge the cells at 1A rate, this will cause problems for a small capacity cell.
Also make sure your LiPo battery you choose can tolerate the heat it gets from the sunlight falling on the hat.