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Lithium battery life study


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There's a reason battery companies don't warranty them forever...

Additionally, not all devices on the same system necessarily "see" SOCs values the same. 

Charlie.

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ALAZARCACOCTDEFLGAHIIDILINIAKSKYLAMEMDMA

Arizona | 2020 Oliver Elite II Twin bed Hull #617 | 2021 Ram 1500 e-Hemi 4x4

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Has anyone read the actual thesis? The abstract shown doesn’t say anything new or exciting, it is common knowledge. I would be very interested to see charts showing the rate of degradation compared to temperature and SOC. If 100 degrees and 100% SOC is bad, how much worse is 120 degrees? 140? It can get toasty hot inside that box, as delivered.

I do try to park with my battery box facing north and/ or pick a site that is shaded after noon when the temperatures are expected to be extreme. And I keep the batteries well below 100%. If I lived and routinely camped in the arid SW desert states I would probably pass on lithium batteries entirely.

EDIT, never mind, you can download the entire thesis on the History tab, it is 197 pages so it may take a while to digest the information. I will try to read it when I have a lot more time. I am off to grease jack actuator gears….

https://diysolarforum.com/resources/calendar-aging-and-lifetimes-of-lifepo4-batteries-and-considerations-for-repurposing.263/version/463/download

John Davies

Spokane WA

"Mouse":  2017 Legacy Elite II NARV (Not An RV) Two Beds, Hull Number 218, See my HOW TO threads: https://olivertraveltrailers.com/topic/john-e-davies-how-to-threads-and-tech-articles-links/

Tow Vehicle: 2013 Land Cruiser 200, 33" LT tires, airbags, Safari snorkel.

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Here is the next paragraph of the abstract.

“Utilizing the collected degradation data from the calendar aging experiments and manufacturer’s cycling data a lifetime degradation model was produced to simulate the extent of aging from different geographic locations and to compare which degradation mode had the most influence over a ten year lifespan. The model was validated using additional data not included in the non- linear degradation model and the results tabulated using real-world temperature and drive cycle data. According to the simulations, calendar aging plays a significant role in the loss of capacity within the battery pack, due to the battery pack not being utilized on a constant basis in the vehicle. Incorporating it into the simulation resulted in the battery pack reaching its EOL much sooner than the targeted consumer requirement of ten years.

😳😤 My bold highlight…. that is not good for an RV application that is not a full timer. FYI the batteries studied were for electric vehicles, not trailers, so the conclusions may not be 100% accurate for Ollies..

John Davies

Spokane WA

"Mouse":  2017 Legacy Elite II NARV (Not An RV) Two Beds, Hull Number 218, See my HOW TO threads: https://olivertraveltrailers.com/topic/john-e-davies-how-to-threads-and-tech-articles-links/

Tow Vehicle: 2013 Land Cruiser 200, 33" LT tires, airbags, Safari snorkel.

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