Not really. That is one thing I have no need to automate. We rarely change our blinds. They are almost always open.
If it was super cheap, like $10 per window I would just because why not.
But the cost for what it provides is probably some of the worst ROI in the HA space.
Not great advice considering these could easily burn your entire house to the ground if not done properly.
Most people do not have the knowledge and skills to even begin to attempt this.
I have built many LiIon battery packs and it is not a huge savings over buying pre-built packs from professionals. The cells are going to be the primary cost no matter what. Then you still need to get an inverter and charge controller and package it all nicely.
These things are intended for people who like the convenience. Telling them to build their own is equivalent to telling my parents that Ring doorbell is overpriced and they should roll their own solution. You know, bu ya DVR, buy compatible cameras, connect it all and securely exposing it online. Easy right?