The US clean energy tax credit is only available for equipment installed on or before Dec 31, 2025 https://www.irs.gov/credits-deductions/residential-clean-ene...
As a result, more used solar should become available on ebay. I'm excited to see what I can do on a shoe string budget.
Battery storage tax credit (30%) runs through 2032, must have at least 3kwh capacity. IRS Form 5695.
https://www.energystar.gov/about/federal-tax-credits/battery...
Don't be surprised when the answer is "not much". Apply supply and demand to electric power generation. If your grid rate is getting hiked then so is the market price of used solar.