I too am interested in anyone that has installed these. I had some concerns
back on Nov 10, 2014. Here is a copy/past from that conversation:
Something does not add up to me. The cell has a voltage discharge curve way
outside that of RE equipment, 1.75 Vpc down to 0.5Vpc. I can't see how this
technology could be scaled to RE applications without wasting much of the
capacity. From what I see, only about 40% could be used before LVD.
And this:
The Aquion battery claims their 2.4kWh, 48 volt stack operates from 59 to 30
volts. Many inverters have a LBCO of 1.75 Vpc (42 volts). Depending on voltage
sag, that means about half of the capacity of the Aquion battery can't be used.
Even if the outback can operate down to 1.5 Vpc, you are still not able to use
the full capacity of the battery unless your load is less than 800 Watts.
I have reviewed their technical presentation and it looks to me like the
capacity simply can't be used in the off grid environment. If you can't use it,
why do they rate it at 2.4kWh? BTW, the Voltage vs.Energy chart on the spec
sheet does not match the first chart I posted.
On Jan 29, 2016, at 7:30 AM, Chris Schaefer <ch...@solarandwindfx.com> wrote:
To All,
Great insight on the lithium movement. I do am looking for anyone
dealing with the new Aquion batteries. I’ve got a couple of potential clients
that have inquired about them. Saw them at a NABCEP training session last
spring and while the idea is moving I wasn’t impressed. Perhaps it’s time to
start a new thread, “Aquion batteries”.
Thanks,
Christopher
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf
Of d...@energysolarnow.com
Sent: Friday, 29 January, 2016 00:49
To: Dan Fink
Cc: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] LiFePO4; WAS Availability of Powerwall Batteries
Thanks for sharing your experience with these batteries, Dan.
I have similar SOC issues with an off-grid customer who has the Aquion Hybrid
Ion batteries.
It has difficulty reaching full charge from solar, requiring the genny to kick
on each morning even in the summer.
This is even worse in cold winter weather.
Your explanation of the change in Peukert's exponent above 80% SOC with NiFe
batteries sounds like what is happening here as well.
Do you have any experience with Aquion batteries that you can share?
Thanks
Don Barch
Energy Solar
d...@energysolarnow.com <mailto:d...@energysolarnow.com>
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