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*
al...@sindelarsolar.com <mailto:al...@sindelarsolar.com>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
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Founder (Retired), Positive Energy, Inc.
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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**

d...@solarwork.com <mailto:d...@solarwork.com> - www.solarwork.biz <http://www.solarwork.com>

*O*- 970.626.5253 *F* - 970.626.4140   c *- *208.721.7003**

*_"Responsible Technologies for Responsible People since 1988_**_" _*

*From:*RE-wrenches [mailto:re-wrenches-boun...@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

IREC Certified Instructor™ for:

~ PV Installation Professional

~ Small Wind Installer

Executive Director, Buckville Energy

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970.672.4342 <tel:970.672.4342>


On Fri, Oct 14, 2016 at 10:14 AM, Tom Duffy <t...@solar-biz.com <mailto:t...@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-boun...@lists.re-wrenches.org <mailto:re-wrenches-boun...@lists.re-wrenches.org>] *On Behalf Of *Dana
*Sent:* Friday, October 14, 2016 8:56 AM
*To:* 'RE-wrenches' <re-wrenches@lists.re-wrenches.org <mailto:re-wrenches@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

d...@solarwork.com <mailto:d...@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>

*_"Responsible Technologies for Responsible People since 1988_**_" _*


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