Same watts.
Different electrical fit.
Compare the figures that change an array—not just the number printed largest on the box. A higher voltage or current is not automatically better; it must fit the station’s documented input.
Two exact panels.
The selected pair comes from the URL. Use a profile or the panel library to choose another source-linked model.
400W Portable
Large portable stations with a solar input that can accept its higher voltage and current.
220W Bifacial
Foldable, higher-output charging for compatible portable power stations.
This gap multiplies with every panel placed in series and grows again in cold conditions.
This gap matters most when strings are placed in parallel or an input has a tight current limit.
*Cold Voc is a planning estimate at −10°C using each published temperature coefficient. It is not a wiring approval. Verify the exact label, lowest local temperature, station manual, connector, polarity, fuse and cable rating.