I just got a quote from Tesla for a solar and powerwall system. They quoted me a 14.19kW solar install with two powerwalls and said that it would cover about 55% of my power demand. They can’t go higher because there’s no room on my roof for any more panels. Obviously I use a lot of power, but a significant portion of it goes to my Model S. I often drive as much as 4000 miles a month and nearly all of my charging is done at home. I like the option of going solar and the net cost of solar with no powerwalls is about $50/month less than what I’m paying for power now, so that seems like a no brainer. However, adding the powerwalls would increase the net cost to about $50/month more than I’m paying for power now, so I’m trying to figure out if powerwalls make sense for me. There is no time of use power rate available here, so the only thing the powerwalls would be useful for is backup in the event of a power failure. The power doesn’t fail here too frequently, but I am in a hurricane zone and when hurricane Matthew came through about three years ago I lost power for three days, so really what I need is protection from extended power failures like that and I’m just not sure that the solar system and power walls will be able to provide enough power 24/7 during an extended outage. Obviously I realize that if the power fails then I will need to cut way back on power usage (not charging the car at home would be a significant part of that), but do you think that this system would be enough to keep my AC and fridge running 24/7 as well as some lights and TV’s and other creature comforts? Right now I have a portable generator that can be used in an extended power outage, but that requires manual setup when the power fails and it also requires me to store gas for it. The ability for the powerwall to take over instantly would be a huge improvement... especially if I’m not home when the power fails. I’m also considering a standby generator, but that’s a big cost as well and I don’t have any gas service at this house, so I would need a large propane tank for that, which would just increase the cost and complexity in making sure the propane tank stayed full. I think the powerwall is a much better option, but I’m just not sure that I’ll get enough output from the solar system to power what I need to keep running in an extended outage.