Check this out...
http://www.cyberpowersystems.com/products/ups-systems/intelligent-lcd-ups/CP1500...

Here's my thoughts...

1. Hook one leg of my inverter to this UPS
2. UPS to to my distribution center (sub panel)
3. Run legs throughout the house off the sub panel with each leg having it's own 15A breaker.

This gives me the ability to isolate rooms and devices from using too much wattage. The UPS catches any loads while the automatic transfer switch (IOTA or whatever I get) flips over in 20 seconds in "generator" mode so there's a full bridge wave that comes through. The UPS is pure sine wave and handles  900W, the inverter puts out a maximum of 1,500W and 1,200W constant so they are almost matched perfectly. I'll add 4 more batteries for a total of 8 or  11.5KWh of storage and we are all set. This UPS comes with software that allows you to monitor it from a computer but even better is it has a LCD screen that tells you everything you need to know without having to run a computer as well, yet another thing to put online.

On a side note, I was going to put up a voltage meter in the living room but instead I found out I can custom setup SNMP alerts and my charge controller can send out "emails" and that means SMS can also be sent out so I'm going to have my system TEXT me on my phone....perfect...that way I'll always know the status etc...

Looks interesting however they never show you what they are doing exactly and that loud humming when they switch to off-grid power is concerning since they did claim it made a pure sine wave. I'd like to see it in action a little more myself.