The installations discussed in the article switch off power generation if mains power goes away, both for technical and safety reasons. If you want mains-indepe

The installations discussed in the article switch off power generation if mains power goes away, both for technical and safety reasons. If you want mains-independent power, more devices are needed, which seems to cost about as much as a typical balcony solar panel installation (which is still needed, of course). I doubt many German deployments are like that, so it doesn't really improve resiliency of electrical power.