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Forum Replies Created
June 7, 2012 at 12:00 am in reply to: Nickel Iron vs. Lead Acid — Off-Grid Battery Showdown #66423
The key to making ANY battery technology last longer than its “useful” life is how much you discharge your battery bank on a daily basis and how often you bring that battery bank to full charge at the end of the day.
If I understand Iron Edison correctly they claim that their batteries can be consistently discharged to 85% and last 20 years. It will not happen. The original nickel iron batteries invented by Thomas Edison cannot even do that. I guess IRON EDISON has found a miracle nickel iron battery. Thomas Edison and all new nickel iron cells are rated at a C/5 rate which means in layman terms that one can charge and discharge at a C/5 rate. That would mean if you had a 100 AH battery bank that you could consistently take out 20 Amp (100 divided by 5 = 20 amps where the discharge rate is at 5 hour rate) or 20% of its battery capacity on a daily basis. However, one can discharge it at a higher C rate on occasion, but not daily. Using IE logic one could remove 85 Ah every day from that battery bank and make it last 20 years. If you where to use IRON EDISON recommendations I believe then you will the same fate as using a flooded lead acid battery and be screwed.
No wonder IR gives you only a 2 year battery warranty and NO battery capacity warranty when BeUtilityFree (link found in GRIDBOUND post above) gives you a 15/10 year warranty on M & W and a 10 year on battery capacity.
Moguitar- The only reason your friends L16’s lasted 25 years was because he was able to remove only 25% out of them and charge them up every day. I would guess that 90% of people who live off grid cannot do that on daily basis so that is why the TYPICAL L16 battery lasts about 6-7 years like yours did.
Dustoffer – Are you not Iron Edison but under a different name? You have posted elsewhere to call you at the phone number of Iron Edison. Do you work for IE?
Key Master – IRON EDISON’s gaol is to promote himself not “educate everyone” and promote his company as anyone can see reading his posts through this forum. To me that so unethical you should strip out his posts that blatantly have his link in them otherwise I think you are not doing your job IMO.
There are many other places for “off grid” products.
Backwoods Solar also has a catalog http://www.backwoodssoalr.com
BeUtilityFree has a great Sourcebook http://www.beutilityfree.com
Real Goods also has a good Surcebook http://www.relgoossolar.com
I would be leery of buying solar modules off of eBay as many of those organizations are fly by night operations. I would deal with a company that has a track record.
In regards to the nickel iron battery, BeUtilityFree also sells nickel iron batteries and I believe actually stocks them and they will match or beat any one else’s price on nickel iron cells plus I believe has the best battery warranty in the industry. https://www.beutilityfree.com/Electric/Ni-Fe
Nickel iron electrolyte is a mixture of potassium hydroxide (KOH) and Lithium hydroxide (LiOH)
They should both be high quality grades and not some “off the shelf” stuff.
I have a small set of nickel iron cells that are 70 years old that I believe at one time where used for powering up a radio. They are 37.5 Ah battery that I turned into a 12V battery. I use them to recharge small electric items such as my cell phone, AA and AAA rechargeable batteries etc. Indeed they work like new after so many years.
I believe the cells you are selling are not made identical to the original nickel iron battery and I correct? Do you believe that your cells will last as long as the original cells and what so what makes you think that when materials today generally are not what they used to be when Thomas Edison started making his cells.