[RE-wrenches] Array/battery relationship (WAS Battery Watt hours FLA VS Iron Edison Batteries)

Fri Oct 14 14:55:46 PDT 2016

Dana (and I'm curious if others agree),
I used to work with 4-5 days of storage, back with modules were 
expensive and batteries were relatively cheap. As in recent years these 
two have reversed - modules are cheap and batteries are dear - my 
fundamental design approach has changed. I now design around 2-3 days of 
storage with a larger array, as long as there's a backup generator in 
the system. I size to at least 100% of the projected winter average 
daily load.

The batteries recharge more quickly, including on partly cloudy days 
between storms. They spend more of their time full, thus keeping them 
happier and giving them as much or more life, even with more and deeper 
cycling. FLAs are easier to EQ, given the hotter charge rate. And the 
customer spends less.

You used to live in SW Colorado, a similar sunny winter climate. Is it 
the same in Idaho where you live now?
Allan

*Allan Sindelar*
allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*

**

On 10/14/2016 3:36 PM, Dana wrote:
>
> I recommend 4 days backup min & 5 days backup if budget allows of 
> storage and Iron Edison were saying that 2 days was sufficient. To 
> clarify - I said “magical” as in wondering if there was something 
> special, I-E did not say this.
>
> __________________________________________________________
>
> Dana Orzel
>
> Great Solar Works, Inc - NABCEP # 051112-136**
>
> dana at solarwork.com <mailto:dana at solarwork.com> - www.solarwork.biz 
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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 *Dan Fink
> *Sent:* Friday, October 14, 2016 12:04 PM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] Battery Watt hours FLA VS Iron Edison 
> Batteries
>
> Tom; I have never seen Iron Edison saying NiFe is "magical" -- do you 
> have a specific webpage on their site that says this?
>
> All batteries have advantages and disadvantages, and also myriad 
> technical issues for the installer to overcome.
>
>
> Dan Fink
>
> Adjunct Professor of Solar Energy Technology, Ecotech Institute
>
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>
> ~ PV Installation Professional
>
> ~ Small Wind Installer
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> Executive Director, Buckville Energy
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>
> On Fri, Oct 14, 2016 at 10:14 AM, Tom Duffy <Tom at solar-biz.com 
> <mailto:Tom at solar-biz.com>> wrote:
>
> Hi Dana
>
> Two thoughts… how many days of autonomy are they quoting?
>
> If nickel Iron were this magical how come nobody has noticed them for 
> the past 100 years?
>
> Kind regards
>
> *Tom Duffy*
>
> *Senior Solar Design Engineer*
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> *From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org 
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>] *On Behalf Of *Dana
> *Sent:* Friday, October 14, 2016 8:56 AM
> *To:* 'RE-wrenches' <re-wrenches at lists.re-wrenches.org 
> <mailto:re-wrenches at lists.re-wrenches.org>>
> *Subject:* [RE-wrenches] Battery Watt hours FLA VS Iron Edison Batteries
>
> Good Morning All,
>
> I have a charity case client that needs 760 to 900 AHR at 24 VDC. I 
> have installed HUP Solar One Batteries for 20+ years and do not have 
> any experience with the Iron Edison battery. My client went to Iron 
> Edison & was told that 360 AHR at 24 VDC would cover the same AHR as a 
> 760 to 900 AHR in FLA.  I understand you can use the IE deeper 
> typically than a FLA.
>
> Math is math to me & how I have sized [successfully for years] Is 
> there something I am missing or has my client been misinformed?
>
> __________________________________________________________
>
> Dana Orzel
>
> Great Solar Works, Inc -  NABCEP # 051112-136
>
> dana at solarwork.com <mailto:dana at solarwork.com> - www.solarwork.biz 
> <http://www.solarwork.com>
>
> *O*- 970.626.5253 <tel:970.626.5253> *F* - 970.626.4140 
> <tel:970.626.4140>  c *- *208.721.7003 <tel:208.721.7003>
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> *_"Responsible Technologies for Responsible People since 1988_**_" _*
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