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Itinerant1

Itinerant

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Joined: 05/23/2017

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Posted: 01/06/20 11:38am Link  |  Quote  |  Print  |  Notify Moderator

We all have different needs or wants and certainly some don't mind hauling around lead with the must do charging profile daily or weekly to get the "longevity" from the batteries.
Our particular wants was (1) major weight savings, (2) not being a slave to the battery, (3) live/operate from solar for the majority of the time and not have to run to a power pole or use the generator for long extended periods of time. LFP checked those boxes for our wants.

I thought the video does a well job with simplified answers for easy understanding.
Start of video to 6:30, low temps
@6:30 high temp/ degradation
@8:30 cycling
@9:30 longevity/ charge profile
@11:30 balancing
@12:50 floating
@15:40 storage
@17:40 cold cranking (which in reality doesn't really apply to lfp) terminology.

What they touched on carries over to all of LiFePo4 basically which for some of us that have been using this chemistry for many years in a daily operating system know because we can see it in operation, but some of the new comers don't really understand it because they read somewhere bad information being parroted.


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

red31

Dallas

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Posted: 01/06/20 12:31pm Link  |  Quote  |  Print  |  Notify Moderator

here he opens one up

https://www.youtube.com/watch?v=G5E30u-66VI

pnichols

The Other California

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Posted: 01/06/20 11:14pm Link  |  Quote  |  Print  |  Notify Moderator

red31 wrote:

here he opens one up

https://www.youtube.com/watch?v=G5E30u-66VI


Man Oh Man ... look at all those little batteries and all those inter-connections that have to be made, and stay made, year after year ... or else.

There is a whole corner of science concerned with the reliability of complex systems - one type of which is a system with only simple inter-connects but a lot of them.

When or when are Group XX sized vehicle lithium batteries going to consist of something like maybe 5 or 6 or 7 individual large cells - so system complexity can be greatly reduced? (In addition, there is a fairly "complex" BMS system required to take care of all those little cells!)

When an RV'er is out and about on the far side of beyond, reliability of the RV systems becomes ultra important - whether it be exploring in the Western U.S. outback or over-landing in Siberia.

I'll think I'll wait until lithium RV batteries become both cheaper and much simpler inside.


Phil, 2005 E450 Itasca Spirit 24V

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North America

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Posted: 01/07/20 05:47am Link  |  Quote  |  Print  |  Notify Moderator

pnichols wrote:


.....

Man Oh Man ... look at all those little batteries and all those inter-connections that have to be made, and stay made, year after year ... or else.

...
(In addition, there is a fairly "complex" BMS system required to take care of all those little cells!)

When an RV'er is out and about on the far side of beyond, reliability of the RV systems becomes ultra important ...


I believe that most production electric cars use this type of battery configuration (approximately 1.3 v multi cell batteries with a BMS) so this technology has been in common use for several years now.

LeRoy


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2015 Chevy 3500, Duramax, 4X4, DRW, Crew cab, Long bed
2013 Northern Lite 8'11"Q Sportsman truck camper
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2oldman

New Mexico

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Posted: 01/07/20 10:03am Link  |  Quote  |  Print  |  Notify Moderator

Yikes. Here's mine:

[image]

MrWizard

Traveling

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Posted: 01/07/20 10:32am Link  |  Quote  |  Print  |  Notify Moderator

Those cells are larger, than what many builders are using
Some use 'prismatic pouch' cells, but many use the much smaller cells
And the Chevy Volt uses those big rectangular plastic encased cells
Whose name escapes me at this moment


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mapguy

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Posted: 01/07/20 02:39pm Link  |  Quote  |  Print  |  Notify Moderator

MrWizard wrote:

Those cells are larger, than what many builders are using
Some use 'prismatic pouch' cells, but many use the much smaller cells
And the Chevy Volt uses those big rectangular plastic encased cells
Whose name escapes me at this moment


PRISMATIC CELL...

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