Before using wrong a plural in a language you don’t know, just use an anglized plural, octopuses (or octopusses).

Afaik, octopodi would be correct as 'pus is actually derived from ancient greek “pous” meaning foot (latin would be “pes”). And even in Latin, not everything ending on -us has -i as plural.

Did not know that rectenna panels could harvest infrared radiation at night. Interesting technology