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eetcowie
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Re: Nickel Iron
eetcowie   5/12/2014 9:37:45 AM
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thanks for the info.

psingh335
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Re: Nickel Iron
psingh335   5/11/2014 7:04:45 PM
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Thank you very much for considering the inclusion of Nickel Iron batteries in your no doubt daunting task of discussing batteries and other storage media.

My main considration for NiFe batteries is (emergency) backup for solar PV during the hurricane season in Florida and the Southern US. The sun is shining but the power line is broken.

A second consideration would be the initial cost of installation, compared to lead-acid, and never having to dispose of these batteries.

The US Solar PV dealers/suppliers do not want to discuss NiFe batteries. The utility companies just do not want solar grid-tie, especially with batteries.

The US manufactured NiFe are expensive.

Do not forget to mention ex-Tonight Show host Jay Leno, the most famous NiFe battery user.

As if you needed another source of energy storage:please mention super-caps that are becoming available an in use by some renewable power generators.

eetcowie
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Re: Charging Batteries
eetcowie   5/9/2014 2:53:16 PM
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Pulse charging, became popular after Nickel Cadmium came out, to measure the internal resistance. It did something like what you describe, but also had the advantage to help break loose (spoken loosely) materials from the electrodes (or in the case of NiCd to help prevent the formation of micro-fine shorts).

eetcowie
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Re: Nickel Iron
eetcowie   5/9/2014 2:45:27 PM
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Ahh, I will add it to the list.

Thanks!

psingh335
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Re: Charging Batteries
psingh335   5/9/2014 2:20:44 PM
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I have read of people who are re-using lead acid batteries which have been withdrawn from automotive service, and they use DC with an AC component, for charging.

psingh335
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Nickel Iron
psingh335   5/9/2014 2:13:55 PM
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It would be remiss to ignore NiFe, since the Chinese battery makers are in full production mode.

No liquids or semi liquids in transportation.

zeeglen
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Re: Charging Batteries
zeeglen   2/3/2014 3:15:48 PM
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@ Stargzer  Back in the mid-to-late 70s Popular Electronics had a simple circuit for a NiCd zapper.

I think it was Pop'tronics that also said a shorted NiCd could sometimes be burned open by momentarily placing it in parallel with a fully charged NiCd cell.  It did work a few times.


Stargzer
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Re: Charging Batteries
Stargzer   2/3/2014 12:56:28 PM
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@eetcowie: "Also, Nickel Cadmium types were notorious for growing metal-fiber 'wires', that would partially short out a cell. There appeared a capacitor-based rejuvenator that would pulse a high-current into the cell to blow out the metal fibers and breathe new life."

Back in the mid-to-late 70s Popular Electronics had a simple circuit for a NiCd zapper.  It had a 24V transformer and a full-wave bridge that charged a capacitor, and it had a selector switch (charge or zap), a pushbutton to zap, and a meter to monitor the charge on the cap and on the battery.  A friend built one to try to resurrect some surplus NiCds he'd bought.  One let out a tremendous FLASH and a ZAP, and then started to take a charge.  The article said if it didn't start taking a charge after 2 or 3 zaps it never would.  He was able to recover most of the "dead" batteries.  Not much of a special waveform, but at the cost of used batteries, you didn't lose much by trying.  I doubt that would work for Li cells!

I also read that another failure mode with NiCds was that a weak cell caught in a string of good cells would be charged in reverse.

 

NielV
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Re: Life of a battery
NielV   12/15/2013 2:23:09 PM
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Keep in mind a Pb-based battery needs to be kept fully charged or it dies, so it is derated to allow for capacity loss over the expected life of a battery.  And in some countries you need to crank at very low temperature where you have only say 25% capacity available.  In temperate climates you can get away with a much smaller battery, especially when you consider you do not have to keep the battery fully charged.  It is commonly stated you need only half the capacity of a Pb-based battery.  Shipping of Li is an issue, however if each cell is less than 20Wh then it is not that hard.

eetcowie
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Re: Life of a battery
eetcowie   12/11/2013 12:00:33 PM
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The amount of lithium it would take to get a battery capacity similar to a car battery creates a little shipping trouble. However, you can find them at places like www.lithionicsbattery.com/rv.html.

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