The best replacement for sunny boy is enphase.

The best alternatives to sunny boy are rated as following:
★★★★★  enphase
★★★★  fronius
★★★  red river
★★★  growatt
★  sonny boy
★  aurora

Your alternative for sunny boy is not listed? Suggest!
Speaking about sunny boy, one probably shouldn't forget about sunny island.

Other search terms related to sunny boy and their ratings are:
★★★★★ sunny island
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sunny boy
enphase
fronius