The instructions for Form 5695 state "You may be able to take a credit of 30% of your costs of qualified solar electric property, solar water heating property, small wind energy property, geothermal heat pump property, biomass fuel property, and fuel cell property. Include any labor costs properly allocable to the onsite preparation, assembly, or original installation of the residential energy efficient property and for piping or wiring to interconnect such property to the home." Therefore, the other parts and labor costs used to complete the installation will be included for the credit.
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