[RE-wrenches] Aquion Batteries

Dana dana at solarwork.com
Fri Jan 29 09:53:56 PST 2016


The set of curves below is a first generation for Aquion.

Attached is a more current set FYI.

 

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Dana Orzel 

Great Solar Works, Inc -  NABCEP # 051112-136

E - dana at solarwork.com  - Web - solarwork.com 

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"Responsible Technologies for Responsible People since 1988"  

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From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Starlight Solar Power Systems
Sent: Friday, January 29, 2016 7:55 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Aquion Batteries

 

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 <chris at 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-bounces at lists.re-wrenches.org] On Behalf Of don at energysolarnow.com
Sent: Friday, 29 January, 2016 00:49
To: Dan Fink
Cc: re-wrenches at 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

don at energysolarnow.com

 

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