Sizing Nickel Iron batteries
Each cell is one container. We use 10 cells in series to make one 12 Volt battery; 20 cells for one 24V battery: and 40 cells in one 48V battery. Pick your capacity (100-2,800Ah per cell) and the number of cells to size your Iron Edison battery. In the price list for each battery above, use quantity of 1--we already take into account the number of cells in your battery.
Remember, you use 80% of the capacity of a nickel iron battery compared to 20% for a lead acid battery. That means you size the Ah capacity of a nickel iron battery much smaller than that of a lead acid battery. For example, a 500Ah nickel iron battery will give you the same usable power as a 2,000Ah lead acid battery!
Exclusive Battery Tests
Iron Edison is the only company to have tested Nickel Iron battery at the National Renewable Energy Laboratory in Golden, CO. Their test confirmed that the cells over-perform at the 5, 10 and 20 hour discharge rates. Check your lead acid ratings, as most batteries are rated at the 20 or 100 hour discharge rate.
Thier cells provide 100% of Amp hour and Watt hour capacity when discharged in 5 hours. When discharged over 20 hours (the lead acid standard), their batteries provide up to 118% of their rated capacity. This means you are getting almost 20% more capacity in every cell. There are absolutely no lead acid batteries can that stand up to this level of performance - especially when you look at capacity over time.
Cell Size Info
All cells come in a clear case that lets you easily monitor electrolyte levels of your battery. There are multiple cell capacities that come in the same size container.
The action which takes place in an Edison cell, both in charging and discharging, is a transfer of oxygen from one electrode to the other, or from one group of plates to the other. This type is called an oxygenlift charge equation. In a charged cell, the active material of the positive plates is superoxidized (nickel(III) oxide-hydroxide) , and that of the negative plates Fe(OH)2 is in a spongy or deoxidized state.
The normal charge rate for the battery is C/5. This is the Capacity of the Battery (in Amp hours) / 5 hours from full to empty = The discharge current (your C-rate). For a 500 Ah battery, the C/5 rate is 500/5 = 100 Amps per hour of charge current. You can charge the battery using any MPPT or most PWM charge controllers and achieve specific charging voltage.
The Nickel Iron battery is able to withstand a Boost Charge, and these short duration high rate charges can be given provided that the temperature of the electrolyte does not exceed 115 F. These short charges are very efficient and cause no injury. Rates up to three times normal can be employed for periods of 30 minutes.
The industrial series Nickel Iron batteries are imported from one of the largest battery factories in the world, located in Sichuan province of Western China. The Iron Edison production facility has been building batteries since 1971, and is known for producing the highest quality batteries available.
After thorough testing and with scores of happy customers, Iron Edison proudly stands behind their brand-new batteries with a 10 year warranty.
In discharging the positive plates deoxidize and the oxygen, with its natural affinity for iron, goes to the negative plates, oxidizing them. It is permissible to continuously discharge up to 25% above normal (this would be about C/4). Occasionally and for short periods, rates up to six times normal can be achieved (this would be about 1C)
Optimum Charge / Discharge Rate: C/4
...Where C is the capacity of the battery in Amp hours
EX: 400 Ah battery
C / 4 = max charge or discharge rate
400Ah / 4h = 100 Amps per hour is the max charge or discharge rate
The electrolyte used in the NiFe battery is a combined solution of potassium hydroxide and lithium hydroxide, which can improve the battery's performance (e.g. cycling life, energy efficiency, wide operational temperature range, etc), allowing it to reach the optimum level. The different standard concentrations of electrolyte allow the NiFe battery to be operated within a temperature range of -4F up to 140F, or -20C up to 60C, which makes the battery able to withstand wide temperature fluctuations that exist in some remote regions.
The alkaline electrolyte is comprised of KOH and LiOH. This is potassium hydroxide and lithium hydroxide. Consult the Materials Data Safety Sheet for proper handling information. Always wear your safety gear!
The electrolyte of the Nickel Iron cells does not enter into chemical reaction of the cell, but acts merely as a conveyor of ions from plate to plate. The specific gravity does not fluxuate during charge and discharge, so we don't follow specific gravity when operating the Iron Edison battery. Specific gravity is only important when you mix a new batch of electrolyte. Considerable variation in specific gravity is permissible, with only minor effects on battery efficiency.
Every Nickel Iron battery ships as a HazMat item. If your battery isn't shipping hazmat, you are not in compliance, and may face serious penalties including forfeiture of shipment. Iron Edison is fully certified to handle your hazmat battery shipment.