Lifepo4 Cell Robustness

[Dot]

Grumpy old men men-o-pause... Terry went walkabout because I asked him one bloody question NO Bruce you may not use that sticky stuff Plenty out this way that need some lead and I am not talking birds either.

[supersparky]

This one of the reasons that those of us that have been involved right from the start don't offer info anymore as we are sick of being told we re liars etc because our testing and findings have proven Terry's concepts.
This is just one of the reasons another is that there have been many so called battery experts that have gained their knowledge from Mr Google and have taken on information from so called experts that often dont' even know the different lithium types net alone how they work. I know some experts who have not even owned the technology they profess to be experts in. Another is that we are sick of being attacked for trying new things outside the box (many are now accepted as normal or preferred) and also Terry is now trying to make a business from his work and the development group have accepted that the knowledge we developed is the property of Terry and we will not divulge what we do or have learnt.
I inspected many vans at the caravan and camping show last weekend in Adelaide and the van offered with lithium left a lot desired in the way the batteries were setup and also the management. The sales people had no idea they considered they were just an expensive option with no real benefits and they substitute 100Ah lithium for 100Ah AGM.
We have tested large discharge and charging voltages and high and low levels of SOC over many sets and years so we are sticking to our research and wait to see how the new developers fair in 5 or 6 years.
The info on several other forums is very suspect but when we suggest otherwise on the other forums our posts are deleted quickly.I posted on one the the day because there was something that I wanted to say re the current knowledge base and it was deleted completely when I returned within an hour. they post was just deleted and all reference to it.
Even to the point when I post I have received email warnings from administrator team to not allow Terry to use my profile.
best to contact Terry if you are really interested and he deems you are not a spy as he is very open with the information if you pass his test, but he will expect you to retain that information gained to your self.
Regards
Brian

Good on you for putting that up Brian. And so true.
Where is the 'like' button Bruce???

[BruceS]

Aren't you glad it's not Bookface? lol

Hi Wayne & Nini!!

[BruceS]

PS. here you go David!
http://www.mywebview.com/viewtopic.php?t=40
You need 'root' access .......... OK with Terrie?

[supersparky]

Yeah, Good one Bruce, how much trouble are you trying to get me into?? I think I will just stick to writing 'Like' !
I don't do FB, but the kids and G kids are trying to enforce it upon us. They won't answer the bloody phone, just send you a text about it all being on Bookface .

[Mrcoolabah1au]

Hi Bruce must come over one day but will wait for T1 to sort out this problem

[Dot]

Hi Bruce must come over one day but will wait for T1 to sort out this problem

Run Bruce run that woman on that supercharged gopher is on her way

[T1 Terry]

No idea how I missed this thread, but thank you all for your positive comments.
As far as the fruit thieves, do rats eat fruit? Something ate all the developing fruit this yr so nothing to even get to rip stage. They even ate all the loquats and last yr the tree was full of them, then suddenly none. This yr they all appeared and then vanished while we were away.

As far as paralleling LYP or LFP batteries as 12v, 24v or 48v, as Native Pepper said, each battery would require its own cell monitoring, charge control and some form of load current sharing so the battery with the shortest cable doesn't do all the light load work and end up deeply discharged when the heavy loads are applied.
It is that very low voltage that does the damage more than the over voltage at cell level. A phenomenon know as reverse current occurs when a cell either side of the cell that has dropped to zero voltage still has some stored energy available. Because the cells are connected in series, the current must flow from one end to the other, 0v at the negative and 12v or there abouts at the negative. To get the current out of the cells it normally joins with the current from the next cell and its voltage adds to the current (amps). If there is no volts left to add that cells positive can't add to the volts and in effect becomes a negative and the current passing through the negative now has more than zero volts compared to that cells positive, so in effect it becomes a positive. Sounds weird but that is what occurs when reverse current flow is forced through a cell. LYP and LFP cells are certainly not designed for this and it causes the rare metals to plate onto the graphite and once enough of the rare metals are lost from the plate that is supposed to have them the cell is dead and may even have enough build up to short circuit between the plates.
Keep between the magic 2.8v and 3.6v and the cell is happy, if all the cells are happy they will continue operating as designed until they can no longer supply current without dropping below the 2.8v. At that point they are no longer suitable for supplying that load but can still supply a lighter load, this continues until they can't supply any load without the voltage dropping and at this stage they are considered unserviceable in any situation.
So far only cells killed by reverse current flow have fallen into that unserviceable category, cells that were exposed to 6 weeks of full solar output over 4 yrs ago are still working in start battery and night time LED flood light applications even though they no longer have the ability to power an inverter without dropping voltage. The actual end of cycle life is still an unknown, they do die but it is more a case of murder than of natural causes to date and that is over 7 yrs now, even abused they still seem to keep going where any other chemical combination battery would fail.

T1 Terry

[SteveW]

Rats do eat fruit - and citrus fruit. Funny how rats have popped up in this topic.

[BruceS]

Better chatting about rats than 'G's got the runs'!!
I get told sometimes a 'rat crawled up & died' .... not sure about that ??