It doesn’t though. It serves a different purpose than a grid-battery at my house. I would avoid using my household battery UPS to ever heat water at all costs.

It doesn’t though. It serves a different purpose than a grid-battery at my house. I would avoid using my household battery UPS to ever heat water at all costs. This system just tinkers with my water heating to help the utility. The Battery Killer theme of the article is misleading.