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Open Roads Forum  >  Tech Issues

 > Lifepo4 cold temp cut off 23F or 32F?

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jaycocreek

Idaho

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Posted: 11/22/21 09:15am Link  |  Quote  |  Print  |  Notify Moderator

Reading on LFP cold cut off I see Expert Power has 23F as there cut off on there batteries and I thought it was 32F?

Expert Power wrote:

Question: Do these have low temperature protection. Will these work for solar power systems?

Answer:Yes, the do have low-temp cut-off (23F for charging / -13F for discharging)


Which is it or?

* This post was edited 11/23/21 08:37am by an administrator/moderator *

pianotuna

Regina, SK, Canada

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Posted: 11/22/21 10:23am Link  |  Quote  |  Print  |  Notify Moderator

It depends in the individual maker.


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.

Tom_M

New Hope, MN

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Posted: 11/22/21 10:34am Link  |  Quote  |  Print  |  Notify Moderator

Checked their web site and it states 32F

https://www.expertpower.us/collections/lifepo4-batteries


Tom
2005 Born Free 24RB
170ah Renogy LiFePo4 drop-in battery 400 watts solar
Towing 1978 VW Bug convertible
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noteven

Turtle Island

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Posted: 11/22/21 10:51am Link  |  Quote  |  Print  |  Notify Moderator

Some battery makers are now building self heating LiFeO4 batteries.

No they don’t use their own amp hours to heat. The batteries can deliver energy down to -20C battery temp.

They use energy from the charging source to warm the cells. Then they begin to charge.

Lithium batteries can accept charge at very high rates.

This is why a small generator or engine alternator charging is probably step one in a lithium system then do the solar spend to round out the system, especially if you camp in winter, forest, shade, or rainy lands.

time2roll

Southern California

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Posted: 11/22/21 11:00am Link  |  Quote  |  Print  |  Notify Moderator

jaycocreek wrote:

Reading on LFP cold cut off I see Expert Power has 23F as there cut off on there batteries and I thought it was 32F?

Expert Power wrote:

Question: Do these have low temperature protection. Will these work for solar power systems?

Answer:Yes, the do have low-temp cut-off (23F for charging / -13F for discharging)


Which is it or?
That seems low to me unless it is a special chemistry. Yttrium does this and will have a Y in the name.

Generally even 32 is pushing it for most LFP as amps could be limited. I recommend making provisions to keep the battery above the 35-40 zone for best life and performance.

WINSTON WB-LYP100AHA LiFeYPO4

* This post was last edited 11/23/21 08:38am by an administrator/moderator *   View edit history

Lwiddis

Near DVNP, California

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Posted: 11/22/21 11:49am Link  |  Quote  |  Print  |  Notify Moderator

I've seen some manufacturers say it is ok down to 24 but no experts. They say 32.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watt solar-Lossigy 200 AMP Lithium battery. TALL flag pole. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad


jaycocreek

Idaho

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Posted: 11/22/21 11:53am Link  |  Quote  |  Print  |  Notify Moderator

I didn't think that was right..Sometimes these answers on Amazon Q&A are all over the place..When I first got my Enjoybot 100ah battery I had some questions and compared it to CHINS which I new alittle about through Will's teardown and test..They were quick to say there not CHINS but answeredin a company format as CHINS..LOL

Enjoybot battery wrote:

If you have other questions, please contact us.
Best wishes
CHINS Peter


[image]

I couldn't be happier with there battery that I am working pretty hard but some of the stuff on the net like, two different Expert Power replies being so different on cold cut off could get someone in trouble..

I see a small Victron MPPT controller in the future for the temp stuff on the battery that does not have cold temp cut off(I assume)..LOL

Thanks

pianotuna

Regina, SK, Canada

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Posted: 11/22/21 12:15pm Link  |  Quote  |  Print  |  Notify Moderator

noteven wrote:

Some battery makers are now building self heating LiFeO4 batteries.

No they don’t use their own amp hours to heat. The batteries can deliver energy down to -20C battery temp.

They use energy from the charging source to warm the cells. Then they begin to charge.

Lithium batteries can accept charge at very high rates.

This is why a small generator or engine alternator charging is probably step one in a lithium system then do the solar spend to round out the system, especially if you camp in winter, forest, shade, or rainy lands.


I wonder how long the heater would take to warm the battery bank at -37 c?

Best possible charge rate for best cycle life is 0.2 c. A 0.5c works well, too. Yes, you can charge faster--but with a trade off in cycle life.

Battleborn batteries have a heated version--and it DOES draw from the battery to keep warm unless there is external power available.

time2roll

Southern California

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Posted: 11/22/21 12:43pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

I wonder how long the heater would take to warm the battery bank at -37 c?
While in use provisions should be made that the battery is not cold soaked.
If preparing for a trip I would expect 2 to 4 hours before use. Put the warmer on the day before.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
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2oldman

NM

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Posted: 11/22/21 12:52pm Link  |  Quote  |  Print  |  Notify Moderator

23.. 32? Looks like dyslexia.

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