You can order the EcoFlow 400 W (Lightweight) portable solar panel, which is the ideal solution for the Delta 3 Max.
This panel is recommended for fast and efficient charging, with a power of 400 W and IP68 waterproofing. The EcoFlow 220 W bifacial panel is also compatible and can be used in tandem to achieve 440 W of charge. The station accepts all panels between 110 W and 400 W, with a solar input of 12 to 60 V and up to 500 W of maximum power.