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Unread 03-30-2016, 01:35 PM   #1
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Default lithium low voltag cut off

I'm in process of doing a lithium conversion and was thinking to tie into the Tow/Run switch wires for my low voltage cut off or would tying in at the key switch be better?
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Unread 03-30-2016, 03:55 PM   #2
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Default Re: lithium low voltag cut off

Tow/run would be a good way but I just went with a loud alarm on mine. It's as loud as my original backup alarm.
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Unread 03-30-2016, 03:57 PM   #3
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Default Re: lithium low voltag cut off

I'm not sure it's a good idea to have it just quit without warning. You could be crossing a road or something. Most electrics powered by Lithium have a limp mode.
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Unread 03-30-2016, 06:01 PM   #4
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Where are you getting the pack? How many AHrs?


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Unread 03-30-2016, 08:07 PM   #5
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Default Re: lithium low voltag cut off

Quote:
Originally Posted by Volt_Ampere View Post
Tow/run would be a good way but I just went with a loud alarm on mine. It's as loud as my original backup alarm.
Ya I've thought about that to. But I know if it is not shut down someone will keep going till it's too late.

It would be nice to be able to do a limp mode or an alarm but I would still want it to shut down at a certain point.
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Unread 03-30-2016, 08:08 PM   #6
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Default Re: lithium low voltag cut off

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Originally Posted by Patela2oh View Post
Where are you getting the pack? How many AHrs?


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I bought a whole battery.
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Unread 03-30-2016, 09:43 PM   #7
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Default Re: lithium low voltag cut off

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I bought a whole battery.
What battery pack did you buy? Nissan leaf? Chevy Volt? Prius? Tesla?
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Unread 03-30-2016, 09:49 PM   #8
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Default Re: lithium low voltag cut off

Leaf, see details here Lithium Nissan Leaf conversion x 2
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Unread 03-31-2016, 10:18 AM   #9
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Default Re: lithium low voltag cut off

Then I recommend you do an alarm at around 15-20% SOC and only shut down at 10%. Without a BMS you should not trust that the pack is balanced well enough to go below 10 or 15% SOC. Remember that the lowest cell is the one will you kill if you take it too low.
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Unread 03-31-2016, 07:18 PM   #10
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Default Re: lithium low voltag cut off

Ya, I was actually planning on cutting it off around 20%. I disconnected the back up alarm when I first got the cart, so I will utilize it for the alarm at about 25%
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