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A fair disclaimer, to be sure. I would say that as long as I use a legally installed, code compliant transfer switch, it is no different than allowing me to use a Generac / Honda, etc generator while the power is down, except for utility revenue. That can be a huge EXCEPT.
Perfect use for a powerwall. Most people don't understand that if the grid goes down with a standard solar system you'll still be out of power. I've been reading that there is actually a company that is making micro-inverters that can actually supply power to the house with the grid down. But I still think a battery system is a great addition to a solar system.
Yes it’s possible but several powerwalls may be needed (depending on demand, size of loads, and time frame). Most people are using the Powerwall (and other battery options like LG Chem & Sonnen) to offset the expensive time of use rates designated by the various utility companies. You can also set up a generator with an automatic OR manual transfer switch to energize the circuits to the inverters. This will allow you to at least use what you’re producing while the sun is out.
At this time TESLA does NOT support the use of the car battery for a house back up. It has been mentioned as something they may offer in the future but as of now, no.
Nissan has this available in Japan for a select group of testers but it requires the use of special equipment installed at the home and a CHADEMO port that is Bi Directional.
So there probably would need to be changes to the vehicles architecture as well as additions to the home to feed the mains.
I think a stand alone system is the best you can get at this time. Whether it is a Powerwall or Sonnan to add to your system. If you add a battery to the Solar before the end of 2019, you will qualify for a 30% tax credit (like the car) that can be extended into further years if needed (unlike the car tax credit). After 2019, the tax credit starts to taper off
My purchased (not lease) solar is on track to pay for itself in about 6 years. I'm 2.5 years in. My system is 8kw. I have some excess capacity that will cover some of the Model 3 charging.
My bill has been $0 since it was installed. And I get a check from the state for producing my own electricity once a quarter (for 10 years). Checks vary wildly. My Electricity rate is $0.23 kwh with no off peak rates.
BTW I saved a ton of by methodically going through everything in the house that was wasting energy. You'd be surprised how much electronics on "standby" use up.
It might only be 10-20 watts, but when it's 24/7/365 it starts to add up. My modern home entertainment system was using 50 watts on standby.
I added relays and control them via a programable remote. I'll probably never get my ROI on the relays though ;( but it sure feels good.
My entire home now is around 300-400 watts on "standby" (If we are not home). I should replace my 2002 Fridge but that will take like 20 years for ROI. Not to mention the waste of a perfectly good fridge.
My Model 3 charging is gonna put me over on the capacity of the system. I have some excess capacity, but not enough.
Well, my payback time is a bit more being that electricity is cheap in Texas (for now). Doing a 14.945 kw system with 49 panels , I am looking at a payback time of 18.5 years at current rates and adding the additional $10 monthly distributed generation (DG) fee to be an ENERGY PRODUCER! Of course it will be less time if the rates climb here but I am in a Coop and they have been low for 10 years. Like flat and low. That is a good thing but the bad is the Monthly Net Meter policy with no payback for overproduction. But bad as they are making carbon emissions (trying to find out what they use to make their electricity). but they do have a solar farm and working on another, so that is good but will not be enough. So that is a long time, but the home is <2 years old and the plan is to stay put (until they wheel me out, hence the one story ).
Now the Powerwalls are a different issue and an indulgence. But at least I can stay up and running in a blackout and give ELON more money.
My system is supposed to go up next week, 19/20 December. I will post pics and info here as it progresses.