Nickel Iron Batteries real data

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weber
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Re: Nickel Iron Batteries real data

Post by weber »

That mud is most likely a mixture of iron hydroxide and nickel hydroxide. Potassium carbonate is highly soluble in water. It won't be precipitating out.
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Re: Nickel Iron Batteries real data

Post by paulvk »

I think its Iron carbonate edisons regeneration of cells used the steel case with pos & neg shorted to regenerate pushing carbon out of the Iron carbonate
which would be in contact with the case.
The other case you can get made is a steel one plain steel mig welded a lip around the top inside to support the white cell top.

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Re: Nickel Iron Batteries real data

Post by weber »

Yes, the iron and nickel hydroxides will turn to carbonates after they have been exposed to air for long enough, same as the potassium hydroxide.
2OH⁻ + CO₂ → CO₃⁻ + H₂O
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Re: Nickel Iron Batteries real data

Post by paulvk »

An update:
I have been running 36 cells in parallel with my 48v VRLA bank for a few months now.
For the past 4 weeks they have been getting cycled at discharge rates of around 5 to 8 amps and get charged at up to 20 amps
when the lead acid banks are getting their 56v bulk charge.
When first connected they supplied around 20% of the load now with more cycling they are getting to providing about 30%
As only 4 cells are new (have total of 41) and one has been cleaned and been refilled with new electrolyte I have been looking at
potassium hydroxide suppliers and find that for about $100 you can buy 25Kg which does about 25 cells for me (200Ah)
so $200 would replace all cells with some leftover.
Some cells gas more than others the one with new electrolyte does not gas very much (the new ones are the same) so when I get time I am going
to do discharge tests to find the weakest cells and clean and replace their electrolyte to see if they improve.
It is clear that if you can get cells at a cheap price you can add capacity to an ageing lead acid bank.
At light discharge rates the cell voltage is 1.3 to 1.4 volts so a 1000Ah bank should be able to supply around 40 amps 2000 watts and be at these voltages.

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Re: Nickel Iron Batteries real data

Post by dRdoS7 »

Hi,

Have you weighed any of your cells?

I weighed 4 of mine a couple of weeks ago, and found that two which have not been touched are about 13kg. One has 1/2" of crap in the bottom, the other has none.

The other two, from six I flushed and renewed, only weigh about 12.5kg.

The specs are 14kg for a 200Ah.

Waiting for some replacements. The seller has received new ones, and was going to charge them before sending to me. Hopefully this week.

Did you try the place you bought your new cells from for some KOH?

dRdoS7

EDIT: I should add that of the six I renewed, only two seem to working OK. The other 4 still "drop off the cliff" when discharging. I'm only running 35 cells ATM. Not quite making it through the night. The bank only discharges to 44V (inverter low). If needed, the inverter will go to 40V before it trips.

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Re: Nickel Iron Batteries real data

Post by russell_drinkwater »

Be warned anyone thinking of purchasing Iron Edison batteries that the cases will split and fail in less than 5 years!
Absolute waste of money. I purchased a small 10 amp unit to experiment with and use for some leds in the house.
Nearly $300 and the cell cases literally fell apart!

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Re: Nickel Iron Batteries real data

Post by dRdoS7 »

Hi,
russell_drinkwater wrote:
Mon, 09 Mar 2020, 05:58
Be warned anyone thinking of purchasing Iron Edison batteries that the cases will split and fail in less than 5 years!
Absolute waste of money. I purchased a small 10 amp unit to experiment with and use for some leds in the house.
Nearly $300 and the cell cases literally fell apart!
Warranty? Did you get them replaced?

dRdoS7

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Re: Nickel Iron Batteries real data

Post by russell_drinkwater »

The warranty is 6 months.
So I would suggest no-one in their right minds buy Iron Edison Batteries.
Very expensive for the bank I needed, between $10,000 and $15,000!
So I am very glad I did go ahead with the purchase.
I may be wrong but I am of the opinion that the earlier non chinese edison batteries had stainles steel cases?

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Re: Nickel Iron Batteries real data

Post by paulvk »

Sorry to hear of your experience.
Original edison cells are in steel cases and the case was used to regenerate the battery.
My cells are in a partly clear blueish case and are second hand showing no signs of problems with the case
except for the one that sustained physical damage causing a crack.
You could get steel not galvanized, bare steel cases made for them.
One thing to note is not to have them in direct sunlight UV radiation will cause problems.

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Re: Nickel Iron Batteries real data

Post by dRdoS7 »

Hi,
russell_drinkwater wrote:
Tue, 10 Mar 2020, 14:02
The warranty is 6 months.
Are you in Australia?
So I would suggest no-one in their right minds buy Iron Edison Batteries.
Very expensive for the bank I needed, between $10,000 and $15,000!
Did you contact IE?

I thought they had a 10 year warranty.

I would have thought they'd be keen to hear of that problem.

Maybe the manufacturer has been skimping on something, and saving themselves some money!

Not unknown to happen.
So I am very glad I did* go ahead with the purchase.
* not?

dRdoS7

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