Seeking “manufacturer’s certification” for tax credit

Hi all,
US IRS tax form 5695 Residential Energy Credits instructions indicate:

Manufacturer’s certification.
For purposes of taking the credit, you can rely on the manufacturer’s certification, in writing, that a product is qualifying property for the credit. Don’t attach the certification to your return. Keep it for your records.

This would be relevant for an installation of Apex300 with an expansion battery, for example, to reach the required storage capacity for the credit, under “Qualified battery storage technology”.

I’ve searched, unsuccessfully, for such a Bluetti manufacturer’s certification on this topic.
Can anyone point me to or provide the certification?

Thanks!

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