Ashem45
Returning Member

Home battery storage tax credit questions

So I am interested in getting a battery storage system for my house, most likely a Tesla Powerwall. I have solar panels installed back in 2017, but was thinking about adding more depending on the costs.

If I go with just the Powerwall option, would that qualify for a Federal tax credit in 2022? Or will I have to wait until 2023? 

If I sign a contract with an installer between now and Dec 31, 2022, and they start installation in 2022, but let's say the battery isn't activated/turns on/goes live until Jan 1, 2023 or later due to the power company dragging their feet on approving it (I had to wait 2 months before my solar panels could be approved/activated by the power company), does that count as a 2022 install  year, or 2023 for the purposes of claiming a tax credit on it?

I live in SE Wisconsin. Are there any state rebates/credits for installing a battery system without the solar panels? Or does it only qualify if I install additional solar panels on my roof?