Nickel Iron Batteries real data

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paulvk
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Nickel Iron Batteries real data

Post by paulvk » Sun, 04 Aug 2019, 11:43

I have just got a set of Nickel Iron cells for my 48v off grid setup and
as there is very little real data from people using them and a lot of negative comments
largely by people who do not have them or are selling other battery tech I am going to put
real facts good and bad here so real life use can be recorded.

First observations from simply charging and testing the cells as they are almost new 200Ah:

Gassing was less than expected charging with 20 amps then going to 16 amps at 1.65 volts per cell left for 4 hours
Note less gassing than flooded lead acid at near same capacity 225Ah

Self discharge appears less than expected they were all at 1.3v or above and had been sitting for very long time before I got them
and after above charge still at 14.2 for a bank of ten week later

Load test after fresh charge 55 amps draw voltage dropped to 1.21 per cell

Watering : the cells 37 of them took 12 liters of water this filled them from just above the minimum to just below maximum line

Will do a discharge test when I have time to set up timers and cut offs.

Regards Paul

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Re: Nickel Iron Batteries real data

Post by moose4621 » Mon, 05 Aug 2019, 05:06

Interesting observations there Paul.

There certainly seems to be some misconceptions about nickel/iron batteries in the web, and as you say, mostly from people with no experience with them.

I have just installed a 48v 300a/h nickel/iron pack to replace a 1380a/h lead/acid pack in a stand alone domestic power supply.
So far, everything is going well and my observations are identical to yours.

Many of the so called negative attributes of nickel/iron are largely of no concern in a stand alone solar system too.
Things like:
  • they have a low energy density. This is true but the 300ah pack I have just installed gives me the same useable capacity as a 1380ah lead/acid because of the severe restrictions on lead acid depth of discharge and so the energy density of the two packs are comparable.
  • They have a high self discharge. Possibly true. But who cares! They are being charged by solar every day.
  • They have poor charge efficiency. Comparitively, yes they are not quite as good as lead/acid but at around 80%, a few extra panels are cheap.
And so on and so forth.

The greatest advantage to me, was the price. Both initial purchase price and running costs. Having purchased the 1380ah lead acid pack 13 years ago for around $14000, and then being faced with a $24000 bill to replace them with the same again, I was imagining what the price would be in another 13 years!
The Nickel/Irons are reportedly lifetime batteries requiring new electrolyte worth a few hundred dollars every 8-10 years. It's a no brainer financially. That's if they do the job.

Like you Paul, I am keen to get some real experience with these and post the results as there is a severe lack of real information on line.
I look forward to hearing about your experience with them.

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Re: Nickel Iron Batteries real data

Post by antiscab » Mon, 05 Aug 2019, 06:52

out of curiosity, what did the nickel iron batteries cost?
Matt
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Re: Nickel Iron Batteries real data

Post by paulvk » Mon, 05 Aug 2019, 07:23

They seem to average $1 per Ah per cell of 1.2V I got my ones second hand for half that.

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Re: Nickel Iron Batteries real data

Post by weber » Mon, 05 Aug 2019, 09:03

Thanks paulvk. I look forward to your data.

Reading this thread so far, was like stepping back in time. Not because you're talking about NiFe cells, but because you're only comparing them to lead-acid. :)
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Re: Nickel Iron Batteries real data

Post by paulvk » Mon, 05 Aug 2019, 10:29

weber wrote:
Mon, 05 Aug 2019, 09:03
Thanks paulvk. I look forward to your data.

Reading this thread so far, was like stepping back in time. Not because you're talking about NiFe cells, but because you're only comparing them to lead-acid. :)
Its like oranges and apples they a flooded cells, bulky (more bulky than lead acid) , heavy and emit hydrogen & oxygen gas so they can not be compared to other technology where space and weight is of concern so in off grid these are not usually a problem then trying to compare them to lithium would also be problematic as its their extremely long life maybe longer than the owner , ability to handle abuse and infinite number of cycles (just need new electrolyte)

They may also work with EV charging storing energy during the day or off peak and charging the EV at night.

This thread may take years just like the PIPs

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Re: Nickel Iron Batteries real data

Post by jonescg » Mon, 05 Aug 2019, 11:20

Looking forward to watching this unfold. Care to share a photo or two of the NiFe cells?

They aren't cheaper than most chemistries, that's for sure. But the longevity sure puts them in good stead for the likes of remote roadhouses etc.
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Re: Nickel Iron Batteries real data

Post by paulvk » Mon, 05 Aug 2019, 11:50

This is the type I have but 200Ah not 400Ah and only two terminal posts not four
[image=]
NiFecell.png
NiFecell.png (149.13 KiB) Viewed 482 times
[/image]

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Re: Nickel Iron Batteries real data

Post by T1 Terry » Mon, 05 Aug 2019, 12:30

Are you using potassium hydroxide or lithium hydroxide in these batteries? Have either of you tried both electrolytes to see what advantages one has over the other?
Is charge control based more on electrolyte temperature than voltage?

Looking forward to reading the information you gather from using these batteries as house power supply and storage

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Re: Nickel Iron Batteries real data

Post by dRdoS7 » Wed, 07 Aug 2019, 13:58

Hi,
T1 Terry wrote:
Mon, 05 Aug 2019, 12:30
Are you using potassium hydroxide or lithium hydroxide in these batteries? Have either of you tried both electrolytes to see what advantages one has over the other?
Is charge control based more on electrolyte temperature than voltage?

Looking forward to reading the information you gather from using these batteries as house power supply and storage

T1 Terry
KOH is the electrolyte used, but LiOH is sometimes added, can't remember why. None in my NiFes.

I'll be interested in hearing others comments WRT to NiFes. How are you making distilled water? How often/how much water are they using.

I installed my 48V 200Ahx40 batteries in 2016, and happy with them. Except.... I have had a couple of duds in the last 3 months. Waiting to return home from our trip, then will replace the electrolyte (seller is sending some KOH) see if that fixes them, or get them replaced.

Mine took a while before they were working to capacity. Then, they were better than the 260Ah AGMs (about 4 years) I had before. Even better once I added another 4.2kW of panels, to the existing 3kW, in 2018.

I use the same charge regime as for AGMs, Bulk/Absorb/Float, just have higher voltage settings. I work on about 75% efficiency, going by Ah in vs Ah out, measured by my meter, over about 12 months usage.

dRdoS7
Last edited by dRdoS7 on Wed, 07 Aug 2019, 14:09, edited 2 times in total.

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Re: Nickel Iron Batteries real data

Post by jonescg » Wed, 07 Aug 2019, 14:02

LiOH does work better than KOH apparently.
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Re: Nickel Iron Batteries real data

Post by dRdoS7 » Wed, 07 Aug 2019, 14:24

jonescg wrote:
Wed, 07 Aug 2019, 14:02
LiOH does work better than KOH apparently.
I've only read of using that in addition to, never as a replacement.

https://en.wikipedia.org/wiki/Nickel%E2 ... on_battery

Do you have a link?

I did find this:

https://en.wikipedia.org/wiki/Talk:Nick ... lectrolyte

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Re: Nickel Iron Batteries real data

Post by weber » Wed, 07 Aug 2019, 14:44

Yeah the LiOH is only an additive. Edison's patents mention 2% by weight. Here's a modern recipe:
http://nickelcells.com/pdf/manuf/Taihan ... attery.pdf
It's 20 g of LiOH and either 333 g or 313 g (it's hard to tell which) of KOH per litre (998 g) of distilled water. So about 1:16 LiOH to KOH by weight.
There's a post here that implies about 1:14. https://www.fieldlines.com/index.php?topic=135792.0
No one seems to know how the LiOH works. It just seems to be "magic sauce all make better".
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Re: Nickel Iron Batteries real data

Post by jonescg » Wed, 07 Aug 2019, 14:49

The lithium ion is smaller, and presumably more mobile than potassium ions, but if that's the case, why then not use entirely LiOH? Cost perhaps? Diminishing returns?
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Re: Nickel Iron Batteries real data

Post by paulvk » Wed, 07 Aug 2019, 15:32

Lithium hydroxide is added to reduce gassing and helps reduce the internal resistance.
As far as water is concerned there are a number of filter systems available with an osmotic filter creating very pure water
there are also stills available that produce 20L per hour could be run when the sun is up.

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Re: Nickel Iron Batteries real data

Post by moose4621 » Thu, 08 Aug 2019, 05:08

paulvk wrote:
Wed, 07 Aug 2019, 15:32
As far as water is concerned there are a number of filter systems available with an osmotic filter creating very pure water
I exclusively used de-ironized water for the lead acids and was planning on using the same for the NiFe's.
I have a still, (ahem, water purification system 8-) ), but with a copper head it produces a desirable flavour for "beverages" but of course that indicates it is no longer pure liquid.

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Re: Nickel Iron Batteries real data

Post by weber » Thu, 08 Aug 2019, 08:06

jonescg wrote:
Wed, 07 Aug 2019, 14:49
The lithium ion is smaller, and presumably more mobile than potassium ions, but if that's the case, why then not use entirely LiOH? Cost perhaps? Diminishing returns?
I believe the reason is diminishing returns, not cost. Yes the bare lithium ion is smaller, but a funny thing happens in solution. The potassium ion is actually more mobile. That's because the lithium ion ends up dragging a bigger retinue of water molecules along with it, because it has a stronger attraction for them. Hydrated radius or Stokes radius actually decreases as you go down the column of the periodic table. So sodium is intermediate in mobility between lithium and potassium, as you would expect.

But even stranger things can happen when these alkali-metal ions intercalate into graphite or transition-metal oxide crystals (which doesn't happen in NiFe cells but does in Li-ion cells). So-called Van der Waals forces can produce a situation where either lithium or potassium will work just fine, but sodium will not, even though it's between them in the periodic table.

paulvk wrote:
Wed, 07 Aug 2019, 15:32
Lithium hydroxide is added to reduce gassing and helps reduce the internal resistance.
It is also claimed (by Edison, no less) to increase the capacity and extend the life.
One of the fathers of MeXy the electric MX-5, along with Coulomb and Newton (Jeff Owen).

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