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 > For BFL13 et al... FLA vs AGM vs Li vs heated Li

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Bend

Oregon

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Posted: 02/21/21 06:01pm Link  |  Quote  |  Print  |  Notify Moderator

I have no dog in this discussion. Just passing the info:

https://www.youtube.com/watch?v=iy3hga_P5YY

Interesting!

* This post was edited 02/21/21 06:24pm by Bend *

pianotuna

Regina, SK, Canada

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Posted: 02/21/21 10:22pm Link  |  Quote  |  Print  |  Notify Moderator

Bend,

Lead acid batteries do not reach their full capacity until they are cycled 25 to 30 times. This makes the whole test invalid from the get go.

The cold weather test was a joke if you live pretty much anywhere in Canada.

I find it hard to believe that they would not use temperature compensated charging with sensors on the batteries.

What about hot weather testing? Damage on LiFePo4 starts at 86 f, and they should not be charged when the temperature is 113 f.

They also did not test what is possibly the best of the lead acid formats which may be SiO2. SiO2 have a much lower Pukert number than most other batteries.

* This post was last edited 02/21/21 11:12pm by pianotuna *   View edit history


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.

StirCrazy

Kamloops, BC, Canada

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Posted: 02/22/21 06:48am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Bend,



What about hot weather testing? Damage on LiFePo4 starts at 86 f, and they should not be charged when the temperature is 113 f.



where did you get that? all the specs I have read on lfp say 60C for not charging them anymore and the normal operating range for max temp is 40 to 50C. would kinda be usless if you were dammaging them at a little bit above room temp dont you think?

Steve


2014 F350 6.7 Platinum
2016 Cougar 330RBK

pianotuna

Regina, SK, Canada

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Posted: 02/22/21 08:43am Link  |  Quote  |  Print  |  Notify Moderator

Hi,

I got that from one of the sellers pages. Heat and Li don't party well together.

Here it is with the source:

"To sum up, for long and happy LFP battery life, in order of importance, you should be mindful of the following:

Keep the battery temperature under 45 C (113 f) (under 30C if possible (86 f)) – This is by far the most important!

Keep charge and discharge currents under 0.5C (0.2C preferred)

Keep battery temperature above 0 C (32 f) when discharging if possible – This, and everything below, is nowhere near as important as the first two

Do not cycle below 10% – 15% SOC unless you really need to

Do not float the battery at 100% SOC if possible

Do not charge to 100% SOC if you do not need it"

The above are from https://www.solacity.com/how-to-keep-lifepo4-lithium-ion-batteries-happy/

BFL13

Victoria, BC

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Posted: 02/22/21 09:31am Link  |  Quote  |  Print  |  Notify Moderator

Bend wrote:

I have no dog in this discussion. Just passing the info:

https://www.youtube.com/watch?v=iy3hga_P5YY

Interesting!


That show's introduction by Igor, Dr Frankenstein, and Herb Tarlek is "interesting" for sure. "Amazing" even! [emoticon]

https://www.google.ca/search?q=Herb+Tarl........HRr6D88Q_h16BAgiEAE#imgrc=faklWchhTl7fzM

Pix for Mex.


1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

3 tons

NV.

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Posted: 02/22/21 09:40am Link  |  Quote  |  Print  |  Notify Moderator

From my perspective I found that the test was interesting though not surprising since (for those who have ‘actually’ switched from wet-cell to LiFePo4) it merely validates our real-world, non-theoretical experiences with now some actual empirical data - ‘Shoot the messenger’ comes to mind (let the ‘battery wars’ begin!!”) - it seems that thread after thread the LiFePo4 deniers (ATTACKS) are limited to the SiO2 camp, who have even denied LiFePo4’s lower internal resistance (thus, optimizing solar peak period harvest)...I can’t help but find this theme (abject bias) curious?

3 tons

BFL13

Victoria, BC

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Posted: 02/22/21 10:01am Link  |  Quote  |  Print  |  Notify Moderator

200%
TWICE THE POWER OF
TRADITIONAL BATTERIES
1/2
HALF THE WEIGHT
5X
CHARGES UP TO 5X FASTER
4X
LASTS 4X AS LONG
100%
SAFE & RELIABLE

From Dakota's LFP site. Gottaluvit!

( I am in the T-1275 "camp", but get by ok with 6s)

We had a run of AGM claims for "5 x faster" too.

--3 tons, do you have measurements of your solar harvest from before you got LFPs and from afterwards, with same conditions, so we can "see your work" and do a peer review on that?

Itinerant1

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Posted: 02/22/21 10:21am Link  |  Quote  |  Print  |  Notify Moderator

Oh boy here we go again.


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 1,600+ cycles.

BFL13

Victoria, BC

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Posted: 02/22/21 10:28am Link  |  Quote  |  Print  |  Notify Moderator

Itinerant1 wrote:

Oh boy here we go again.


Nope. You showed your work and it all made sense.

3 tons

NV.

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Posted: 02/22/21 10:41am Link  |  Quote  |  Print  |  Notify Moderator

All Manufacturer’s all make marketing claims...Though I believe that SiO2 are a viable competing alternative (as I’ve elsewhere stated...), I doubt that SiO2 vendor’s enjoy an exemption...

3 tons

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