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Open Roads Forum  >  Tech Issues

 > Li Snap Pack anomaly

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pianotuna

Regina, SK, Canada

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Posted: 11/15/21 05:28pm Link  |  Quote  |  Print  |  Notify Moderator

Hi All,

I brought my li snap pack home from the RV storage--as I think freezing is not a great thing for that chemistry.

I happened to check the snap pack state of charge at the RV. The temperature was 0 C (32 f).

reading suggested 96% state of charge.

The next day at the Condo at 21 c (70 F), I checked again. It was reading 80%.

Anyone have an idea about what is going on?


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Boon Docker

Mountain Foothills of Southern Alberta

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Posted: 11/15/21 06:58pm Link  |  Quote  |  Print  |  Notify Moderator

When you first checked, the little electrons were so cold they could not escape until it warmed up then a bunch of them left. [emoticon]

time2roll

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Posted: 11/15/21 07:10pm Link  |  Quote  |  Print  |  Notify Moderator

Does it go back to 96% when left in the cold again?
What does the manual say on operating temperatures?


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otrfun

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Posted: 11/16/21 06:49am Link  |  Quote  |  Print  |  Notify Moderator

We just went through a cold snap a few days ago. Our lifepo4's SOC and voltage was rock solid from 65f down to 25f. Zero fluctuation.

Could be a BMS/firmware issue/burp. A before/after voltage check with a VM that has at least .xx(v) resolution can confirm whether you've really lost any charge.

Itinerant1

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Posted: 11/16/21 07:38am Link  |  Quote  |  Print  |  Notify Moderator

otrfun wrote:

We just went through a cold snap a few days ago. Our lifepo4's SOC and voltage was rock solid from 65f down to 25f. Zero fluctuation.

Could be a BMS/firmware issue/burp. A before/after voltage check with a VM that has at least .xx(v) resolution can confirm whether you've really lost any charge.


I have never seen deviations between SOC and cell temps at anytime over the years.

What is a Li snap pack though?


12v 500ah (5,120Wh usable), 20 cells_ 4s5p (GBS LFMP battery system). 8 CTI 160 watt panels (1,280 watts)2s4p,Panels mounted flat. Magnum PT100 SCC, Magnum 3012 hybrid inverter, ME-ARC 50. Installed 4/2016 been on 24/7/365, daily 35-45% DOD 1,800+ cycles.

3 tons

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Posted: 11/16/21 03:30pm Link  |  Quote  |  Print  |  Notify Moderator

“What is a Li snap pack though?”

It could be almost anything I suppose (??) the joy is in the guessing - [emoticon]

I could only come up with this:

https://discount99.us/18%20volt%20snap%20on%20battery?p=bco&gclid=91f7fa4f90e0102426b29bdbbf2ef968&msclkid=91f7fa4f90e0102426b29bdbbf2ef968&utm_source=bing&utm_medium=cpc&utm_campaign=campaign+%5B023%5D&utm_term=18+volt+snap+on+battery&utm_content=adgroup+%5B23%7Cw5%7Cb%5D%3A+%7B2-18%7D

3 tons

* This post was edited 11/16/21 03:48pm by 3 tons *

pianotuna

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Posted: 11/16/21 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

A "snap pack" is a battery with cables intended to start vehicles when their own battery had died. I'm sorry that was confusing.

Here is a link: https://www.walmart.com/ip/GOOLOO-4000A-........t-Portable-Power-/955479349?athbdg=L1400

[image]

There is nothing in the manual about temperature vs capacity.

I don't wish to subject the pack to another low temperature excursion.

3 tons

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Posted: 11/16/21 05:09pm Link  |  Quote  |  Print  |  Notify Moderator

PT, Got it, I have one similar myself but did not know what it is called, Thanks for washing my windows [emoticon]

3 tons

Itinerant1

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Posted: 11/16/21 06:16pm Link  |  Quote  |  Print  |  Notify Moderator

I was thinking that might be what you were talking about. I have the NOCO boost GB150 but it lives a pampered life temperature wise, in the 5th wheel when not traveling in the truck.

3 tons

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Posted: 11/16/21 07:06pm Link  |  Quote  |  Print  |  Notify Moderator

FWIW, my guess is that due to the higher power density required, it ‘may be’ of a ‘hotter’ cobalt based chemistry rather than LiFePO4…Just a guess…

3 tons

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