Bluetti AC180 Solar panels charging at 70%

[TanRu]

I have a Bluetti AC180 with 1 100w solar panel. I check the solar panel at it is 100w. The end of the Bluetti cable is at 100w. It will only charge at 70w. When I put 2 panels in serial or parallel I get 200w using volt meter at end of the Bluetti cable plugging into the unit. I get 140w. Is the 30% decrease normal?

FYI. Bluetti said this is normal.

 

[jjpaul]

Interesting. I'm using 145w panel and I just barely get over 100w which would be 70%.