I paid for new solar equipment in 2019 and 2020 ( a deposit and then final payment) - do I split the payment ?

I paid for new solar equipment (battery backup) in 2019 and 2020 ( a $1000 deposit in 2019 and then final payment in 2020) - do I split the payment into each year, or allocate the whole purchase to one year or the other?

Thanks for your help!

Deductions & credits

No.  The credit is claimed as of the date the system is fully installed and placed in service. 

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