According to the manual, the solar panel input must be 11-30V 10A(300W Max). After some research, it seems that if you go over 30V, it will refuse to charge. If you go over 10A, it will simply take only 10A and the rest is wasted. So most important is that the panels do not exceed 30V.

I ordered the following:
PowerOak S220 Solarpanel für PS2 Powerstation (220 W)

with an MC4 -> XT60 extension cable:
EcoFlow XT60 Kabel (5 m) (Solarkabel)

Unfortunately I cannot confirm if everything will work until everything arrives.


For better performance with solar panels, something like this might be a better choice, although it's quite a bit heavier and more expensive:
Bluetti Power Station AC200 Max (2048 Wh)

it supports up to 900W solar charging (10V-145V, 15A), meaning you could use a panels like this one, from the same company:
PowerOak Solarpanel S420 420 W, 36 V (420 W)
the official website suggests that you can use 1, 2 or 3 of these panels connected in series on the AC200Max

I will post an update after everything arrives and I have some time to test.

Here is the solar panel from Anker: Anker 625 Solar Panel (100 W)
A total of 3 of the Anker 625 panels (connected in series) can be connected to the Power House 757.