solar battery vs solar panel

solar battery and solar panel both are nouns.

Word	Noun	Adjective	Verb	Adverb
solar battery	Yes	No	No	No
solar panel	Yes	No	No	No

As nouns, solar battery and solar panel are synonyms defined as:

solar battery and solar panel: electrical device consisting of a large array of connected solar cells

Other synonyms of solar battery include solar array.

solar battery (noun)	solar panel (noun)
electrical device consisting of a large array of connected solar cells	electrical device consisting of a large array of connected solar cells