Don't you work for Pila? Shouldn't you know that? If you backfeed during an outage, and then the grid reconnects, you're fighting the grid. If you backfeed dur

Don't you work for Pila? Shouldn't you know that? If you backfeed during an outage, and then the grid reconnects, you're fighting the grid. If you backfeed during an outage and an electrician is trying to fix lines near you, you can hurt them. Why does the OP say it "disconnects in 20 ms of detecting an outage"? If it's a UPS, it doesn't need to disconnect - It's just no longer fed by the grid. If it's back-feeding, the point would be to _start_ the connection when you detect an outage. But backfeeding is an extremely bad idea.