riniboo
Posts: 8
Joined: Fri Mar 23, 2018 6:46 am
Delivery Date: 23 Feb 2018
Leaf Number: 12345

Using Leaf as emergency power backup - electrical question

Wed Apr 25, 2018 9:45 am

I saw some videos people use their EV as emergency power backup, it can run for several days with 2018 Leaf I believe. I am planning to buy an Pure Sine Wave Inverter in case of blackout. However, the more I read about it, the more complicated it gets. It is regarding to "bonded neutral" vs "floating neutral", this is very similar to gas generator.

I bought a Reliance Control Transfer Switch TF151W for the furnace, because you cannot use an extension cord. If you understand some basic AC electrical concept, you will know in the Main Service AC Panel in our houses in North America, the Neutral (white) and Ground (Green/bare copper) are connected/bonded by code.

Now, I have a problem/question. If I need to run the following:

1. Furnace (using extension cord to the Transfer Switch, neutral/ground ARE BONDED at service panel)
2. Gas water heater (using extension cord, neutral/ground are NOT bonded)
3. Fridge (using extension cord, neutral/ground are NOT bonded)

If I need to get a Pure Sine Wave Inverter for my Nissan Leaf, what should I get? If I get a bonded neutral (Inverter tied the White+Green wire internally), then I run into problem of "double bonded" for #1 which is very dangerous. However, if I get a floating neutral (Inverter doesn't tie the White+Green wire internally), then #1 furnace will be good but #2 Gas water heater and #3 Fridge may not function properly because the micro-computer may detect it's floating may refuse to start. Either way I am stuck.

Anyone into solar panels or have used Leaf to power your home, feel free to comment. I wish we have that "Nissan Vehicle to Home" system like they are having in Japan and Europe.

smkettner
Posts: 7172
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: Using Leaf as emergency power backup - electrical question

Wed Apr 25, 2018 6:34 pm

When using a transfer switch to power a branch circuit the utility source and bond is out of the circuit.
The only bond should be at the power source be it the inverter or generator or the utility entrance panel.

You really need 2000+ watts to power these household items and 2000 watts is too large to draw directly off the small 12v car battery. You really need a bank of 4 to 6+ large batteries as a buffer and let the vehicle charge these larger batteries.
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV
I-Pace on order for end of 2018 delivery

riniboo
Posts: 8
Joined: Fri Mar 23, 2018 6:46 am
Delivery Date: 23 Feb 2018
Leaf Number: 12345

Re: Using Leaf as emergency power backup - electrical question

Thu Apr 26, 2018 7:03 am

2000W+ inverter is fine. If I understand correctly, for EV I was told that you need to start the car (Prepare to drive, put it in Park mode) and turn off all the lights, radio, AC/Heat, etc.. 2018 Leaf has the 40-kWh battery, this way it will keep charging the 12V battery while inverter will draw the DC from the 12V battery without draining. It should be able to run for couple of days depends on the load, I think that's how the "Nissan Vehicle-To-Home" in Japan/Europe system works.

WetEV
Posts: 2256
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: Using Leaf as emergency power backup - electrical question

Thu Apr 26, 2018 7:08 am

riniboo wrote:I think that's how the "Nissan Vehicle-To-Home" in Japan/Europe system works.


Vehicle to home is a CHADEMO interface directly to the HV battery.
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red

riniboo
Posts: 8
Joined: Fri Mar 23, 2018 6:46 am
Delivery Date: 23 Feb 2018
Leaf Number: 12345

Re: Using Leaf as emergency power backup - electrical question

Thu Apr 26, 2018 7:29 am

WetEV wrote:Vehicle to home is a CHADEMO interface directly to the HV battery.


Good to know... Thanks. My Bad on this one. I wish we have that in North America. Even our local utility published a white paper and they have done the testing on Nissan Vehicle to Home system. But never rolled it out...

WetEV
Posts: 2256
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: Using Leaf as emergency power backup - electrical question

Thu Apr 26, 2018 8:04 am

riniboo wrote:
WetEV wrote:Vehicle to home is a CHADEMO interface directly to the HV battery.


Good to know... Thanks. My Bad on this one. I wish we have that in North America. Even our local utility published a white paper and they have done the testing on Nissan Vehicle to Home system. But never rolled it out...


You can do it. Requires a transfer switch, a fairly expensive home CHADEMO unit...

http://www.princetonpower.com/images/pd ... 016_r1.pdf
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red

borugee
Posts: 48
Joined: Fri Sep 15, 2017 8:06 pm
Delivery Date: 15 Sep 2017
Leaf Number: 303100
Location: Dallas TX

Re: Using Leaf as emergency power backup - electrical question

Sat Apr 28, 2018 3:27 pm

Borugee
2018 SL ; 03/18 Delivery ; Dallas TX

hmmwv
Posts: 89
Joined: Wed Jun 10, 2015 8:27 am
Location: Seattle, WA

Re: Using Leaf as emergency power backup - electrical question

Wed May 23, 2018 4:49 pm

The 12V system can only supply 1000W continuously. I bought a 1000W continuous / 2000w surge pure sine wave inverter and use it to power a few appliances (lights,fridge, TV, kettle, etc) during power outage. You really want to have some nice lower gauge cables between the inverter and the 12V battery.
2013 LEAF SL w/Premium Pkg, Brilliant Silver, 53,144 miles, LeafSpy: 49.756 AHr, SOH 74%, Hx70.30% as of 08/20/2018, 10 bars, 28 QC, 2069 L2/L2

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