Hybrid Car – More Fun with Less Gas

iron hydroxide battery?

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Posted by Willcox on January 2, 2005, 1:03 am
Anybody know of information on old type iron hydroxide batteries? Like
used on farms  before the Rural Electrification Act?? I know they're big
and heavy, but last forever. Where can I find information on how these
are built?

Posted by Robert Morein on January 2, 2005, 1:38 am

You may not want to build one.
Unlike lead acid, iron batteries have only 70% charge efficiency.
This means you have to put in much more than you take out.

Posted by Gymy Bob on January 2, 2005, 2:59 am
 "Unlike lead acid"?

Even at 100% efficiency by the amphour rating we still charge our banks at
135-140VDC and discharge them at 125VDC and less as the charge wanes. That
is an 11% loss just by voltage level alone.

I doubt you will get out the amp*hours you put in either. The conversion
process produces gases, boils the electrolyte and wastes heat.

Posted by uguess on January 2, 2005, 3:28 am

Not to mention the cost of replacement every 3-5 years

Posted by Robert Morein on January 2, 2005, 4:01 am
 I've heard of charge efficiencies of around 90%, not in big disagreement
with what you say.
The Xantrex SW Plus manual has a section on iron batteries. The units can be
adjusted to work with iron batteries, but they specifically point out the
much lower charge efficiencies.

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