WrenchesI have used Iron Edison Batteries and 12 volts is tough but l have had
no issues at 48, you can set the high side voltage enough to work well. They
are a very thirsty battery technology but may last for ever. Round trip
efficiency is 70% at best so a larger array is required and the batteries don't
like it to cold either.Jerry Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Ken Schaal <k...@commonwealthsolar.com>
Date: 11/21/18 11:36 AM (GMT-08:00) To: RE-wrenches
<re-wrenches@lists.re-wrenches.org> Subject: Re: [RE-wrenches] Ni-Fe update?
Hey alexis.Any thoughts regarding these comments about Ni-fi batteries?Ur
running them DC direct?Hope all is well. KenOn Wed, Nov 21, 2018, 2:25 PM David
Katz <dk...@backwoodssolar.com wrote: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 KatzOn 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
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