Appropriate for critical load backup system?
I'm looking at migrating from (or supplementing) a series of small SOHO UPS systems for my various electronics loads to something larger and more robust that would serve more than electronics. I found a product from Trip-Lite that is a 1kw inverter/charger (external battery bank must be provided) and PSW output regardless of operational state (pass-through or on-backup), basically a line-interactive UPS with extensible battery capacity (APS1012SW). They also have some larger models in the same family.
Has anyone seen something like this used to power a small panel for critical loads within a single family home (electronics, small fridge, safety lighting)? It looks pretty ideal for a DIY (and grow-able via more and better batteries) system but would like some opinions and feedback about integrating something like this into home wiring scenario.