I like the idea. But to be completely portable, what would one do for inverter grounding? I don't plan on a portable but will the MPP run safely if not connected to the grid? I honestly don't know. I have been looking at MPP and like this one:
www.mppsolar.com
I haven't made a decision on an inverter yet. I have 8 280ah cells on the way so I have many options. Since my use will be primarily for a UPS, MPP might be the way to go even though I can't do solar for now.
The one I linked to features AVR, has 4 built in AC sockets (no hard wiring) and comes with the battery cable.
It is 2700 watts which is way more than I would need for now. The only downside is it is limited to 25 amps for charging and as I said no hard wiring for AC. But it's about as plug and play as any I have seen with only the AC grid having to be wired into it.
I also like the programming capability of the MPP Solars. To get all those features in other inverter/chargers one has to spend a lot of money.