If you have solar on your house I would suggest just having a solar backup battery installed. We have an Enphase system and it's been great. Nigh time grid outages occur and it kicks right over without missing a beat.
We also have a system rated at about 19 kW, with Enphase microinverters and management. Outages are rare, where I live, so I can't justify the expense of a battery that will rarely, if ever be used. I do have a Leaf, and am in contact with Fermata to see about installing their V2H system, so I can use my Leaf's battery for home backup (and maybe some profit—selling back to the grid in summer at peak demand). In the meantime, we also have a Mitsubishi Outlander PHEV GT, which has two 1500 W, 120 VAC outlets...