AEE Solar sold NiFe batteries from Russia in the late 1990s. They last a long time but were hard to use with inverters. A 12 volt pack has 10 cells. Each cell reaches full charge at 1.7 volts so the pack would be at 17 volts. that is 68 volts in a 48 volt pack. inverters turn off for over-voltage before that. When they are operating the cells are at 1.2 volts. The charge efficiency is about 60% when you look at watt hours in vs. watt hours out. They also use a lot of distilled water. I had a set that required watering every 3 weeks. I did not keep up with watering once and one of the cells exploded when the water level got below the plates. I would suggest L-ion batteries instead. David Katz
On Wed, Nov 21, 2018 at 10:37 AM Ray <r...@solarray.com> wrote: > Charge efficiency is really low, Charging parameters can be hard to get > right, Voltage is not stable under heavy loads, and they are really > expensive to boot. I've never sold them for these reasons, but I have > replaced some sets that customers were unhappy with. They seem to work OK, > only if there are no large surge loads, and the battery and array are sized > large enough. Unfortunately because of the cost, folks seem to really > under size them, which only exasperates the above issues. > > There's good reasons this old battery chemistry has not been widely > adopted by the solar industry. It does have its place, and I understand > the train industry uses it because A) they have cheap on grid charging > available, so efficiency doesn't matter, and B) they have telecomm type > loads with very little surge. > > Ray Walters > Remote Solar > 303 505-8760 > > On 11/21/18 10:55 AM, d...@foxfire-energy.com wrote: > > Hi Guys, I have a potential customer inquiring about installing a pre > packaged Iron Edison system.. I recall hearing strange stories about Ni-Fe > batteries but don't recall the specifics. I have done a few searches with > mixed results.. And have friends advising I run like a Rabbit.. Thought I'd > run it by you folks for an update.. > Thanks, and Happy Turkey Day. > > db > > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564 > www.Foxfire-Energy.com > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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