Line 7a/7b of Form 5695 refers to Fuel Cells, which are not solar-related.
From Form 5695 Instructions:
Qualified fuel cell property costs.
Qualified fuel cell property costs are costs for qualified fuel cell property installed on or in connection with your main home located in the United States. Qualified fuel cell property is an integrated system comprised of a fuel cell stack assembly and associated balance of plant components that converts a fuel into electricity using electrochemical means. To qualify for the credit, the fuel cell property must have a nameplate capacity of at least one-half kilowatt of electricity using an electrochemical process and an electricity-only generation efficiency greater than 30%.
Form 5695, Line 1, is the appropriate line for claiming the Residential Clean Energy Credit for amounts paid for qualified solar electric property.
Source: https://www.irs.gov/pub/irs-pdf/i5695.pdf
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