EcoFlow MC4 Solar Extension Cable 3m. The EcoFlow Solar Extension Cable (3m) extends the Solar to XT60 Solar Cable  (3.5m) by an additional 3m.. Highlights. Provides additional cable length, which allows you to keep an EcoFlow power station in the shade while the solar panels receive direct sunlight.. In the Box. EcoFlow Solar Extension Cable ×2. Specifications. Cable Type: Solar Extension Cable. Length: 3m