Sunny Boy has released a inverter for Grid Tied PV that has a 120 volt plug on the base of it. If the sun is out and the grid is down, the unit supplies up to 15 amps with no batteries. Its roughly a $300 extra cost compared to similar inverters. It obviously doesn't work at night but may be enough for some folks to have a bit of backup when the grid goes down. I expect that someone might be able to plug in a UPS (if it doesnt draw too much juice) and use the UPS to extend its usefulness. I will let the pellet folks figure out if it will work for them. There are battery based grid tied units out there but the overall cost bump is significant (as well as their capabilities). I am also not sure if many leasing companies will install these as most of them use microinverter based PV as its a lot easier to plan install with less front end design albeit at a higher cost than a central inverter. Given the ongoing federal solar tax credit and many state incentives, this may be the thing that convinces some folks on the fence to make the install. Of course if the power is out due to a storm like what hit the Atlantic coast it was a few days before the clouds cleared out. With my 2KW array I still get some power even on cloudy days so there may be some power available but they may have a low end cutout of some sort. I unfortunately missed out on this with my new system.