Comment by toomuchtodo

Is this a utility requirement? My understanding is this was due to previous IRS guidance about battery tax subsidies that potentially no longer applies, although I wouldn't be surprised if this is a utility requirement to be on a time of use plan to prevent you from maxing savings by having solar and charging from utility mains at night.

https://diysolarforum.com/threads/new-irs-requirements-for-b...

> The private [IRS] letter ruling was from 2016, prior to the explicit credit for batteries.

From 2023:

> “Batteries and the federal tax credit at a glance: Residential batteries installed in 2023 can qualify for the 30% federal tax credit, even if they aren’t attached to solar panels. The value of the tax credit will vary depending on the equipment installed and labor costs. The battery must be installed at the taxpayer’s residence and be owned by the taxpayer to receive the tax credit.”

(the setting is controlled by Tesla and I have heard some folks, anecdotally, having it removed with a support ticket, ymmv)