woodgeek
Posts: 94
Joined: Sat Aug 23, 2014 3:16 pm
Delivery Date: 08 May 2014
Leaf Number: 425493
Location: Philadelphia Metro

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Sat Oct 22, 2016 7:21 am

arnis wrote:
gonefishin wrote:If somebody has blackout system could he/she report: will Leaf keep voltage at 13V or 14.4V if it finds out a huge load? Will it switch
from 14.4V to 13V right after switching the vehicle to READY mode even if there is a load due to 12V-120V inverter.


Under load, my DC-DC was putting out a very steady voltage at 1200, 500 and 0W_ac output, over the course of several hours. IIRC, it was 13.8V at the LEAF.

woodgeek
Posts: 94
Joined: Sat Aug 23, 2014 3:16 pm
Delivery Date: 08 May 2014
Leaf Number: 425493
Location: Philadelphia Metro

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Sat Oct 22, 2016 7:23 am

Had a short outage this AM, and used the LEAF system to backfeed my house for an hour. All 240V breakers off. 100-500W. No issues.

FYI: Backfeed was done with appropriate interlock in place, if you don't know how to do this safely, don't.

arnis
Posts: 713
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Sat Oct 22, 2016 11:29 am

woodgeek wrote:Under load, my DC-DC was putting out a very steady voltage at 1200, 500 and 0W_ac output, over the course of several hours. IIRC, it was 13.8V at the LEAF.


And you have your negative lead connected right to the battery terminal?

Interesting. 13.8V is not known on Leaf. So lets suppose Leaf is not connected to anything. As soon as you switch it on, at what voltage
does it hold the 12V system? 13.8V? Do you use voltmeter on the terminals or any other integrated voltmeter somewhere inside inverter?
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
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Graffi
Posts: 399
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Delivery Date: 06 Sep 2013
Leaf Number: 414757
Location: San Diego, CA

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Sat Oct 22, 2016 8:09 pm

Some time ago we were notified by our Utility that our neighborhood would be turned off overnight for some maintenance. I sleep with a c-PAP machine to breath at night so I used a small inverter from Harbor Freight plugged into the car, then extension cord from car and garage down hall to bedroom. I slept well, thank you. With the Leaf in Ready mode, and no adjustments for display lights, I used it overnight. The next morning all was well, the inverter worked great, and displayed GOM went down very little. I do not remember, but it was almost nothing, maybe one or two miles range loss. Sorry to not have a better or more accurate reporting, but did not write it down, I just remember it was almost nothing.

Hope this helps.
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woodgeek
Posts: 94
Joined: Sat Aug 23, 2014 3:16 pm
Delivery Date: 08 May 2014
Leaf Number: 425493
Location: Philadelphia Metro

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Sat Oct 22, 2016 8:30 pm

arnis wrote:
woodgeek wrote:Under load, my DC-DC was putting out a very steady voltage at 1200, 500 and 0W_ac output, over the course of several hours. IIRC, it was 13.8V at the LEAF.


And you have your negative lead connected right to the battery terminal?

Interesting. 13.8V is not known on Leaf. So lets suppose Leaf is not connected to anything. As soon as you switch it on, at what voltage
does it hold the 12V system? 13.8V? Do you use voltmeter on the terminals or any other integrated voltmeter somewhere inside inverter?


I did the neg connection by clamping directly to the drive unit...pos to the battery clamp.

Upon reflection, I think it was 12.8, but def v steady. That's 12.8 across the 12V battery. At 1200W_ac output, and 140A_dc, the drop on my 2 AWG leads was over half a volt (more like 12.2-12.3 at the inverter). It was similar across the battery at different loads, including no (external) load.

arnis
Posts: 713
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Sun Oct 23, 2016 9:55 am

woodgeek wrote:
arnis wrote:
woodgeek wrote:Under load, my DC-DC was putting out a very steady voltage at 1200, 500 and 0W_ac output, over the course of several hours. IIRC, it was 13.8V at the LEAF.


And you have your negative lead connected right to the battery terminal?

Interesting. 13.8V is not known on Leaf. So lets suppose Leaf is not connected to anything. As soon as you switch it on, at what voltage
does it hold the 12V system? 13.8V? Do you use voltmeter on the terminals or any other integrated voltmeter somewhere inside inverter?


I did the neg connection by clamping directly to the drive unit...pos to the battery clamp.

Upon reflection, I think it was 12.8, but def v steady. That's 12.8 across the 12V battery. At 1200W_ac output, and 140A_dc, the drop on my 2 AWG leads was over half a volt (more like 12.2-12.3 at the inverter). It was similar across the battery at different loads, including no (external) load.


That seems really reasonable. 13.0V is everywhere if there is no massive load. But if there is 140A current running from DC-DC convert to battery terminal, there is definitely voltage drop across that positive cable as well. Therefore battery terminals could be at 12.8V.
Could we trick DC-DC device to supply 14.4V. This should drop amps (10%?). Therefore some gain in efficiency.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

woodgeek
Posts: 94
Joined: Sat Aug 23, 2014 3:16 pm
Delivery Date: 08 May 2014
Leaf Number: 425493
Location: Philadelphia Metro

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Sat Nov 05, 2016 3:15 am

Had a derecho come through here last week, and it made a couple hundred small outages in my and neighboring towns. We had a transformer explode, so we were out for 18 hours or so.

The LEAF-inverter system ran our fridge, (LED) lights, wifi and personal electronics just fine, and we depleted the dash SOC by 30%.

Most important for the wife....it can (just) run our Nespresso pod machine. :roll:

ClarD
Posts: 20
Joined: Mon May 02, 2016 8:17 pm
Delivery Date: 06 Apr 2016

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home

Tue Feb 07, 2017 12:34 pm

LeftieBiker wrote:10 amps at 12 volts, IIRC, which is 120 watts.


I see "10 Amps" in the Owner Guide, but the 2013 Service Manual says it comes from a dedicated 20A fuse #21.

Duncan
Posts: 56
Joined: Thu Jan 03, 2013 3:45 am
Delivery Date: 01 Feb 2013
Location: Sydney, Australia

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Thu Mar 16, 2017 12:48 am

Just wanted to say thanks for the idea in this thread, with a 2000w (240v) inverter my leaf now makes very passable coffee at our hillclimb venues.

the inverter can potentially draw 200a @12v but the coffee machine only needs 1600w I guess it's only drawing 160A.

awesome idea thanks guys

https://youtu.be/XydY1J6CNc8

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Nubo
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Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Using the Leaf for power in a Blackout: MY "Leaf to Home"

Wed Apr 12, 2017 2:16 pm

I've gotten a 300 watt unit for smaller loads. The unit has a "chassis ground" separate from the negative 12v input. I don't understand this. What would be the point of putting 120V AC onto the vehicle chassis? That doesn't even seem to be an effective ground and I'd really worry about frying the vehicle electronics.
I noticed you're still working with polymers.

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