Aerowhatt
Posts: 350
Joined: Wed Jan 28, 2015 1:52 pm

Re: Using the battery as an emergency supply

Fri Apr 14, 2017 2:40 pm

pbui19 wrote:
Aerowhatt wrote:
You are in luck though because during charging L1 or L2 the dc to dc converter is powered and charging the 12 volt battery under the hood. So you can pull 12 volt power off the system while it is charging too.

Aerowhatt


would the i have to be in non-ready mode ? i believe L1/L2 charging only occurs in off ? Thanks for the tip by the way.


Start charging first then you can turn the key to accessory or on, either one. You can use the fan and all other electronics inside the car. The DC to DC provides the power. Powering an inverter off the 12 volt battery is the same deal, power comes from the wall (or solar system) through the DC to DC converter. As long as you started charging L1 or L2 with the key in the off position to start with. Then you can turn the key on and do whatever you want to (except drive the car) The charging does not stop because the key was turned on!

Aerowhatt
2014 cool silver ES, acquired new 4/2015
2014 Labrador Black Pearl ES, acquired new 3/2016

9h1bw
Posts: 26
Joined: Sun Mar 19, 2017 2:35 am

Re: Using the battery as an emergency supply

Mon May 01, 2017 1:15 am

Hi all I just found the time to experiment using the battery as an emergency supply.

Using an inverter I attached a 95watt electric bulb and monitored the consumption using a kill a watt meter. I let the load on until one notch on the fuel meter was consumed.

The result is not very exciting since I consumed 0.24kwhr at the kill a watt meter, while the fuel meter showed I used up one notch. According to my reckoning each notch is equivalent to 1kwhr. Thus way more energy was consumed than used by my load.

Am I mistaken in my calculations?

wmcbrine
Posts: 324
Joined: Wed Apr 29, 2015 10:26 am
Location: Laurel, MD
Contact: Website

Re: Using the battery as an emergency supply

Mon May 01, 2017 2:06 am

9h1bw wrote:Am I mistaken in my calculations?

It's possible that most of that "notch" was already gone when you started. Plus we know the gauge is non-linear. I think you'll need a more accurate way to measure the car's charge. (Canion?)

9h1bw
Posts: 26
Joined: Sun Mar 19, 2017 2:35 am

Re: Using the battery as an emergency supply

Mon May 01, 2017 3:09 am

Before I took the measurement I allowed the load on until the first used notch was used up.

Do you have any recommendations on how I can measure the consumption more accurately?

kiev
Posts: 510
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Using the battery as an emergency supply

Mon May 01, 2017 4:29 am

yes, purchase an LX OBDlink dongle for $50 from scantool.net and download the android app, Canion, to monitor the voltage and current of the pack. It will be the best $ ever spent...
kiev = kenny's innovative electric vehicle

9h1bw
Posts: 26
Joined: Sun Mar 19, 2017 2:35 am

Re: Using the battery as an emergency supply

Mon May 01, 2017 10:04 pm

Thank you for your recommendations.
Just to clarify what I did. I had the engine set to Ready during the test.

9h1bw
Posts: 26
Joined: Sun Mar 19, 2017 2:35 am

Re: Using the battery as an emergency supply

Sat Aug 26, 2017 12:50 pm

I have just found a dc to ac inverter which has an input voltage of 380 volts dc to 230 v ac. Do i have to programme the iMiev to be able to use the dc charger output ?

Does anyone have the pin connection for the dc plug?

kiev
Posts: 510
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Using the battery as an emergency supply

Sat Aug 26, 2017 6:24 pm

i have a labelled picture on myevblog site, here's a link:

http://fsamw.myevblog.com/i-miev-techni ... rge-notes/
kiev = kenny's innovative electric vehicle

9h1bw
Posts: 26
Joined: Sun Mar 19, 2017 2:35 am

Re: Using the battery as an emergency supply

Sat Aug 26, 2017 10:21 pm

Kiev,

That is a very interesting blog you have put up. Do you have photos of the relay and how to get to the relay and Chadomo?

I am assuming you have tried to use the Chadomo dc output to an inverter. What were your findings and how well does it work?

Thanks

Chris

kiev
Posts: 510
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: Using the battery as an emergency supply

Sun Aug 27, 2017 1:54 pm

i just did it to learn how to get access to the pack voltage terminals. i made some 9mm terminals to plug in, but haven't used them for either charging or as a power supply. This was back before i could read the CAN buss data so don't know what kind of messages get sent out by the car while doing this, but it would be interesting to read some time.

Here is a diagram and photo of the relay to go along with the instructions on the blog:

Image

Image

You will likely get better efficiency running direct vs using Ready Mode--avoids the ON state overhead loads.
kiev = kenny's innovative electric vehicle

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