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 > 200a/hr LFP Load test results…

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FWC

The Wilderness

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Posted: 12/09/21 12:31pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

jaycocreek wrote:



I find that interesting as I have been running my Iceco JP 42 compressor fridge 24/7 (33*) for quite some time..I'm at 40% SOC AT the end of the 6th day and down 58ah..Gives people an idea on how long these lfp last,compared to the same ah AGM..


Or you could use an SiO2 with similar total power.


Relative to the test that the OP is describing, you would get far worse performance from SiO2. Remember when BFL13 performed exactly the same test with his SiO2 battery?

He was only able to use 39Ah from his 100Ah battery with a 0.65C load.

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NV.

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Posted: 12/09/21 12:34pm Link  |  Quote  |  Print  |  Notify Moderator

I’d be interested to know how the SiO2’s discharge voltage profile compares to LFP…

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NV.

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Posted: 12/09/21 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

Per FWC: “ Remember when BFL13 performed exactly the same test with his SiO2 battery?”

And recall, “all those hoops” mythology one must ‘jump through’ when using LFP (huh?…kinda strange as I’ve yet to adopt a single new piece of equipment - still using my OEM PD 9245 with charge wizard dongle (in boost) and same two solar controllers)…

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pianotuna

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Posted: 12/09/21 02:40pm Link  |  Quote  |  Print  |  Notify Moderator

jaycocreek,

I believe LiFePo4 are excellent--so long as it is not too hot, or too cold.

As far as loading SiO2 is outstanding.

Speed of charging is not an issue for me--because I'll have either six or seven as my house bank. At .25 C that means charging at 150 amps is possible--except I have nothing that could provide that much energy.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

FWC

The Wilderness

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Posted: 12/09/21 04:08pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

jaycocreek,

I believe LiFePo4 are excellent--so long as it is not too hot, or too cold.

As far as loading SiO2 is outstanding.

Speed of charging is not an issue for me--because I'll have either six or seven as my house bank. At .25 C that means charging at 150 amps is possible--except I have nothing that could provide that much energy.


I am not sure I would consider only being able to use 40% of rated capacity under a moderate load as 'outstanding'.

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NV.

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Posted: 12/09/21 04:34pm Link  |  Quote  |  Print  |  Notify Moderator

It’s true that user requirements often do vary…From my own perspective the sole material issue could be with ‘charging below 32f’ (note, discharging is far lower…), yet this one parameter can be easily overcome with either a built into the battery heater option, or adding a retro-heated battery blanket, or via interior cabinet mounting (as I’ve done), or by simply awaiting the next available harvest window…For added clarity, Mfg specs on my battery state:

Charge Temp: from 32f up to 113f
Discharge Temp: from 149f down to -04f
Storage Temp: -04f to 113f

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StirCrazy

Kamloops, BC, Canada

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Posted: 12/09/21 06:44pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

jaycocreek,

I believe LiFePo4 are excellent--so long as it is not too hot, or too cold.



I dont think any of us have to worry about being to Hot. I was camping last ummer in the middle of the heat dome and I can tell you no one would want to camp at 60degrees, I was in 48 and I had to jump in the truck every few hours and go for a drive for AC, I was miserable and stubbron just so I could get a good site for when the wife came out. people who camp in that weather are not buying a ton of batteries, there getting hookups so they can run there AC 24/7

as for to cole, its not the outside temp it is the battery temp and there are tons of people doing things that your just to stubron to do to ensure that the batteries stay in the proper temp range.

Steve


2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

pianotuna

Regina, SK, Canada

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Posted: 12/09/21 08:43pm Link  |  Quote  |  Print  |  Notify Moderator

Safe is not stubborn.

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NV.

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Posted: 12/09/21 10:12pm Link  |  Quote  |  Print  |  Notify Moderator

“Safe is not stubborn”….

Kinda Interesting having this exchange morph into one of ‘safety’ - by learned default, this always draws my attention…

Not to in anyway to pass judgement here (merely an abstract stream of consciousness - lol …), but in my previous career I discovered that the ‘claim of safety’ could be intentionally mis-used (though not all too common) as a shielding tactic to paralyze dissent, and hamstring forward actions…Obviously we’re not in that type of setting, but know that (when the stakes and stressors are high…) it’s takes an especially rare and accountable Man to dare risk challenging claims of SAFETY - This, FWIW, just my uncolored opinion obtained during a previous career…now RET.

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akkeosflomdis

New York

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Posted: 12/14/21 03:34am Link  |  Quote  |  Print  |  Notify Moderator

Keep in mind the LFP will do the same at the top end. No extended absorption top charging the last 10% of capacity. No loss of solar potential until the battery to tip top 100% charged and then it does not matter.
If using a generator LFP can cut 4+ hours off the final charge to 100%.

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