What does qualified property for Economic Stimulus mean?

"Qualified property for Economic Stimulus" is property that qualifies for special depreciation deductions (Section 179 and Bonus Depreciation).

Will the 100% bonus depreciation under economic stimulus be available in TY 2021 for equipment purchased in that year?  Is this related to covid stimulus?

This deduction was just extended thru the 2026 tax year ...  https://www.irs.gov/pub/irs-drop/td-9916.pdf

Section 13201 of the TCJA made several significant amendments to the
additional first year depreciation deduction provisions in section 168(k) (additional first
year depreciation deduction).

First, the additional first year depreciation deduction
percentage was increased from 50 to 100 percent.

Second, the property eligible for the
additional first year depreciation deduction was expanded, for the first time, to include
certain used depreciable property and certain film, television, or live theatrical
productions.

Third, the placed-in-service date was extended from before January 1,
2020, to before January 1, 2027 (and from before January 1, 2021, to before January 1,
2028, for longer production period property or certain aircraft property described in
section 168(k)(2)(B) or (C)).

Fourth, the date on which a specified plant may be planted
or grafted by the taxpayer was extended from before January 1, 2020, to before
January 1, 2027. T

Thank you for your thorough and prompt answer.  Doing some tax planning and wondering if is is a POSSIBILITY, depending on which administration is in power after the elections, whether this deduction might be rescinded? I suppose it is revocable, in which case I should definitely take advantage of it this year.

Does Solar Panel installation on a residential rental property Qualify (bought and installed in Nov. 2019)?

Yes, it does qualify in your case. Here is the IRS information pertinent to your situation:

What is the tax credit for installing solar panels?

A solar PV system must be installed before December 31, 2019, to claim a 30% credit. It will decrease to 26% for systems installed in 2020 and to 22% for systems installed in 2021. And the tax credit expires starting in 2022 unless Congress renews it. There is no maximum amount that can be claimed.

Thanks for the quick response.

Asset purchased and place in service in 2021 & 2022? Are the qualified stimulus deduction?

Assets placed in service in 2021 or 2022 would qualify for whatever was allowed in the year they were placed in service.  You can't fix that on your 2023 return.