Boulder BC panels to Yeti 1500x

When attaching my two Boulder 100 briefcase panels and one Boulder 200 briefcase panel to my Yeti 1500 power station. The information screen will initially show that I am receiving 330 - 350 watts of input power and then will quickly reduce down to 150 - 160 watts of input. The panels are all connected individually as there are enough input ports to receive these 3 panels. I am reading about “chaining” the panels but do not understand if this is actually necessary.

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