[RE-wrenches] RE-wrenches Digest, Vol 5, Issue 275

[Jimmy]

re-wrenches-request at lists.re-wrenches.org wrote:

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>
>Today's Topics:
>
>   1. Re: Ballasted Roof Racking Recommendations? (Dana Brandt)
>   2. Re: Power line communications interference (Dana Brandt)
>   3. Re: Ballasted Roof Racking Recommendations? (Bill Hoffer)
>   4. Re: Trojan L-16 SG Readings- Did Something Change? (John DeBoever)
>   5. Battery Specialist (dan at foxfire-energy.com)
>   6. Re: Battery Specialist (bob ellison)
>   7. Re: Ballasted Roof Racking Recommendations? (R Ray Walters)
>   8. Re: Ballasted Roof Racking Recommendations? (benn kilburn)
>   9. Re: Ballasted Roof Racking Recommendations? (David Brearley)
>  10. Grid tie with BB (Rich Nicol)
>  11. Re: Grid tie with BB
>      (Larry Crutcher,	Starlight Solar Power Systems)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Fri, 31 Aug 2012 12:17:21 -0700
>From: Dana Brandt <dana at ecotechenergy.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Ballasted Roof Racking Recommendations?
>Message-ID:
>	<CAEo4MB0BYk3gmJPdYKxVgXLWGG1XQu2paqFakSV01h-jNreinA at mail.gmail.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>We just did a system on 10 degree AET and liked it. I think they have a 30
>degree option. I'd be worried about inter-row shading, though.
>
>The DPW POWER-FAB BRM has more flexibility with row spacing, but I found it
>to be pretty expensive.
>
>Dana
>
>Dana Brandt
>Ecotech Energy Systems, LLC
>www.ecotechenergy.com
>dana at ecotechenergy.com
>360.318.7646
>
>
>On Tue, Aug 28, 2012 at 1:56 PM, Glenn Burt <glenn.burt at glbcc.com> wrote:
>
>> Hi Ryan,****
>>
>> ** **
>>
>> We have used the AET Rayport stainless steel ballasted racking system on
>> dozens of installations and have been quite satisfied with the light
>> ballast required (all open racking), integral module grounding, lightweight
>> of materials (pressed stainless steel) and quickness of assembly.****
>>
>> ** **
>>
>> http://aetenergy.com/products/RAYPORT-B-solar-mount-solution****
>>
>> ** **
>>
>> Glenn Burt****
>>
>> glb, Consulting Company****
>>
>> ** **
>>
>> *From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
>> re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Ryan Harkins
>> *Sent:* Tuesday, August 28, 2012 2:32 PM
>> *To:* RE-wrenches
>> *Subject:* [RE-wrenches] Ballasted Roof Racking Recommendations?****
>>
>> ** **
>>
>> Anyone have recommendations for a ballasted roof racking manufacturer?
>>  Tilts of 30-degrees or more would be best.  ****
>>
>> ** **
>>
>> *Ryan Harkins**
>> NABCEP Certified Solar PV Installer /
>> Project Manager*
>>
>>
>>
>> ****
>>
>> _______________________________________________
>> List sponsored by Home Power magazine
>>
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>------------------------------
>
>Message: 2
>Date: Fri, 31 Aug 2012 12:26:59 -0700
>From: Dana Brandt <dana at ecotechenergy.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Power line communications interference
>Message-ID:
>	<CAEo4MB2=jAX34QE8qCn5WZZzG4w6K1HWUmaGUT_jihtRr2Zizg at mail.gmail.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>Enphase recommends this ferrite toroid you can put on the lines to the pump
>to filter out the noise:
>
>http://www.digikey.com/scripts/DkSearch/dksus.dll?vendor=0&keywords=Epcos%20B64290L0082X087&cur=USD
>
>Dana
>
>Dana Brandt
>Ecotech Energy Systems, LLC
>www.ecotechenergy.com
>dana at ecotechenergy.com
>360.318.7646
>
>
>On Thu, Aug 23, 2012 at 2:51 PM, August Goers <august at luminalt.com> wrote:
>
>> William,
>>
>> You might try calling Enphase again. I was discussing a similar issue with
>> them recently and they said that they have a noise filter option for
>> handling noisy lines. As with all tech support, some representatives are
>> better than others.
>>
>> -August
>>
>>
>> August Goers
>>
>> Luminalt Energy Corporation
>> m: 415.559.1525
>> o: 415.641.4000
>> august at luminalt.com
>>
>>
>> -----Original Message-----
>> From: re-wrenches-bounces at lists.re-wrenches.org
>> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
>> Miller
>> Sent: Thursday, August 23, 2012 10:32 AM
>> To: RE-wrenches
>> Subject: [RE-wrenches] Power line communications interference
>>
>> Friends:
>>
>> In the old days of the Sunny Boy Control Light we battled problems with
>> power line communications due to interference from external sources.  I am
>> now troubleshooting a problem with and Enphase Envoy.  I have spoken to
>> Tech Support several ties about this.  I was told I need to move the Envoy
>> out to the array, not an elegant solution.
>>
>> Never once was it suggested that interference could be the problem but it
>> turns out when we turn off a pond pump the system communicates flawlessly.
>> Have any of you dealt with this?  If so, what have you done to remedy the
>> problem?
>>
>> William
>>
>> Miller Solar
>> Voice :805-438-5600
>> email: william at millersolar.com
>> http://millersolar.com
>> License No. C-10-773985
>>
>> _______________________________________________
>> List sponsored by Home Power magazine
>>
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>------------------------------
>
>Message: 3
>Date: Fri, 31 Aug 2012 12:36:53 -0700
>From: Bill Hoffer <sunengser at gmail.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Ballasted Roof Racking Recommendations?
>Message-ID:
>	<CAL4Seawz7KOhf1a1gLe=g7LQRs3Dm=CPVAjqunJY95BkJWxnPQ at mail.gmail.com>
>Content-Type: text/plain; charset="windows-1252"
>
>Ryan
>
>I do not think that they have a 30 degree option, but I have been pretty
>impressed with Dynoraxx <http://dynoraxx.com/>tool-less approach and using
>fiberglass non-conductive material ( read no grounding of racking).  Now
>all we need is a fiberglass non-conducting module frame!
>
>Bill Hoffer
>
>On Fri, Aug 31, 2012 at 12:17 PM, Dana Brandt <dana at ecotechenergy.com>wrote:
>
>> We just did a system on 10 degree AET and liked it. I think they have a 30
>> degree option. I'd be worried about inter-row shading, though.
>>
>> The DPW POWER-FAB BRM has more flexibility with row spacing, but I found
>> it to be pretty expensive.
>>
>> Dana
>>
>> Dana Brandt
>> Ecotech Energy Systems, LLC
>> www.ecotechenergy.com
>> dana at ecotechenergy.com
>> 360.318.7646
>>
>>
>> On Tue, Aug 28, 2012 at 1:56 PM, Glenn Burt <glenn.burt at glbcc.com> wrote:
>>
>>> Hi Ryan,****
>>>
>>> ** **
>>>
>>> We have used the AET Rayport stainless steel ballasted racking system on
>>> dozens of installations and have been quite satisfied with the light
>>> ballast required (all open racking), integral module grounding, lightweight
>>> of materials (pressed stainless steel) and quickness of assembly.****
>>>
>>> ** **
>>>
>>> http://aetenergy.com/products/RAYPORT-B-solar-mount-solution****
>>>
>>> ** **
>>>
>>> Glenn Burt****
>>>
>>> glb, Consulting Company****
>>>
>>> ** **
>>>
>>> *From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
>>> re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Ryan Harkins
>>> *Sent:* Tuesday, August 28, 2012 2:32 PM
>>> *To:* RE-wrenches
>>> *Subject:* [RE-wrenches] Ballasted Roof Racking Recommendations?****
>>>
>>> ** **
>>>
>>> Anyone have recommendations for a ballasted roof racking manufacturer?
>>>  Tilts of 30-degrees or more would be best.  ****
>>>
>>> ** **
>>>
>>> *Ryan Harkins**
>>> NABCEP Certified Solar PV Installer /
>>> Project Manager*
>>>
>>>
>>>
>>> ****
>>>
>>> _______________________________________________
>>> List sponsored by Home Power magazine
>>>
>>> List Address: RE-wrenches at lists.re-wrenches.org
>>>
>>> Options & settings:
>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>
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>>>
>>>
>>
>> _______________________________________________
>> List sponsored by Home Power magazine
>>
>> List Address: RE-wrenches at lists.re-wrenches.org
>>
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>>
>
>
>-- 
>Bill Hoffer PE
>NABCEP Certified Solar PV Installer?
>Sunergy Engineering Services PLLC
>2504 Columbia Ave NW
>East Wenatchee WA 98802-3941
>SunEngSer at gmail.com Cell:(509)679-6165
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>------------------------------
>
>Message: 4
>Date: Fri, 31 Aug 2012 20:05:22 +0000
>From: John DeBoever <jdeboever at trojanbattery.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Trojan L-16 SG Readings- Did Something
>	Change?
>Message-ID:
>	<CC4E5D1C542D8C4C9CBEE800875F05357F8D248C at Trojmail1.trojanbattery.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>Sequoya, Wrenches,
>
>Thank you for your patience on this, as I had no easy Internet connection. Below are the clarifications requested.
>
>
>
>
>?  Trojan Premium L16RE-B datasheet can be found here: http://www.trojanbatteryre.com/PDF/datasheets/L16REB_TrojanRE_Data_Sheets.pdf
>
>
>
>?  Trojan Premium line ( http://www.trojanbatteryre.com/PDF/Premium_Trojan_ProductLineSheet.pdf   ) has indeed changed its specific gravity from nominal 1.260+-0.007 to nominal 1,280+-0.007 since March 2012 production.  This change was motivated to reduce the confusion in the field between Trojan Premium line S.G. values and Trojan Signature line S.G. values.  They are now identical.  Only Trojan IND line S.G. remain at 1.260 .
>
>
>?  During the beginning of the life of the battery, an optimized development process of the plates porosity will take place to maximize the surface access contact between the electrolyte and the lead sulfate crystal within Trojan proprietary exclusive paste formulation.  This optimum moisture of the active material at the beginning of the battery life is the continuation of an advanced factory-controlled 72-hour curing process and increase the electrical conductivity and improved discharge performance of the active material paste, resulting in Trojan's proven both sustained capacity and total overall ampere-hours,  resulting in more operating power. The variation can reflect approximately 7 points in the S.G.
>
>
>?  The date code can be found on the negative terminal and consist of one letter and one figure.  The figure for 2012 is "2". Any date code from and after "E2"  (i.e. Code date with letter E2, F2, G2,...)
>
>will have a nominal S.G. of 1.280 . Prior that, the nominal S.G. was 1,260.
>
>I hope that helps,
>
>John
>
>
>
>John F. DeBoever
>Global Technical & Projects Director - Renewable Energy
>Trojan Battery Company
>
>12380 Clark Street
>Santa Fe Springs, CA 90670
>Tel: +1-562-236-3000 Ext. 3139
>Cell: +1-845-514-7600 - NY office time zone: USA EST (GMT-5)
>Skype: john.f.deboever
>Fax: +1-562-236-3239
>jdeboever at trojanbattery.com<mailto:jdeboever at trojanbattery.com>
>www.trojanbattery.com<http://www.trojanbattery.com/>
>
>From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Sequoya Cross
>Sent: Thursday, August 30, 2012 3:08 PM
>To: re-wrenches at lists.re-wrenches.org
>Subject: [RE-wrenches] Trojan L-16 SG Readings- Did Something Change?
>
>We are wondering if anybody knows when the Trojan L-16RE-B batteries went from full SG readings of 1.265 (after an 18 month "plate forming" period) to 1.280 that they now state on the data sheet. We have been having customers use 1.250 as a full reading which would gradually increase over time to 1.265 and that might take/might not be seen for 18 months. Now we see that a "full reading" should be 1.280 and maybe still a "plate forming" period or maybe not? Does anyone know the date code that we can use with customers to see what they should be looking for (should have been somewhere between 2010 and 2012)? I have this question out to Trojan as well, but haven't received confirmation and wanted to know what data you all were seeing as well.
>
>Thanks-
>
>Sequoya Cross
>1589 Rapid Lightning Creek Rd
>Sandpoint, Idaho 83864
>www.backwoodssolar.com<http://www.backwoodssolar.com/>
>Phone(208)263-4290
>Fax (888) 273-8279
>
>We are an online and catalog business that caters to off-grid and grid-tie customers, with technicians that own and operate a variety of renewable energy systems using the products that we sell. We take great pride in getting to know our products so that we can recommend the best for our customers.
>
>
>
>
>
>
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>
>Message: 5
>Date: Fri, 31 Aug 2012 15:53:54 -0700
>From: <dan at foxfire-energy.com>
>To: re-wrenches at lists.re-wrenches.org
>Subject: [RE-wrenches] Battery Specialist
>Message-ID:
>	<20120831155354.720a661d8db719b1f2ad39509c9edaa3.a0c674c5df.wbe at email14.secureserver.net>
>	
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>------------------------------
>
>Message: 6
>Date: Fri, 31 Aug 2012 18:57:39 -0400
>From: "bob ellison" <reellison at gmail.com>
>To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Battery Specialist
>Message-ID: <00f801cd87cc$068092a0$1381b7e0$@com>
>Content-Type: text/plain; charset="utf-8"
>
>I wire them thru bus bars now, but in the past before I did that I used to move them around occasionally. 
>
> 
>
>Later,
>
>Bob
>
> 
>
>From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of dan at foxfire-energy.com
>Sent: Friday, August 31, 2012 6:54 PM
>To: re-wrenches at lists.re-wrenches.org
>Subject: [RE-wrenches] Battery Specialist
>
> 
>
>Hi Guys, Seems my "Battery Specialist" is back. Yes, this is the same guy that convinced a few of my customers that most installers are clueless because we clean terminals with a wire brush instead of a razor blade (and don't believe in desulphators).  Now it seems he's telling folks that batteries should always be operated in the exact Sequence in which they were originally configured. i.e. #1 in the string should always be #1, #2 should always be #2 etc. I've been suggesting to folks (who still run multi string set ups) that they physically mix up their batteries periodically (at least once mid life cycle), to manually alter high resistance current paths. Call me old fashion, but I'm of the impression that only  Kirchhoff's Laws apply here. Am I missing something - again? Thanks db
>
> 
>
>
>Dan Brown
>Foxfire Energy Corp.
>Renewable Energy Systems
>(802)-483-2564
>www.Foxfire-Energy.com
>NABCEP #092907-44
>
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>
>Message: 7
>Date: Fri, 31 Aug 2012 21:43:41 -0600
>From: R Ray Walters <ray at solarray.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Ballasted Roof Racking Recommendations?
>Message-ID: <4A49BD16-8A0C-4037-8033-AECB1924BCC2 at solarray.com>
>Content-Type: text/plain; charset="windows-1252"
>
>Sunpower has just that.  Very easy install, no grounding issues, super high efficiency. Downsides: expensive, Plastic, finicky layouts from their engineers that preclude using it on smaller roofs.
>
> I would use it again for a larger roof that needed to max out the output/ sq ft of roof.  It's probably the best commercially available module in the world, definitely the most efficient.  Last I checked it qualified as American made, though some of it is made in indonesia I believe.
>
>Ray Walters
>
>On Aug 31, 2012, at 1:36 PM, Bill Hoffer wrote:
>
>> Ryan
>> 
>> I do not think that they have a 30 degree option, but I have been pretty impressed with Dynoraxx tool-less approach and using fiberglass non-conductive material ( read no grounding of racking).  Now all we need is a fiberglass non-conducting module frame!
>> 
>> Bill Hoffer
>> 
>> On Fri, Aug 31, 2012 at 12:17 PM, Dana Brandt <dana at ecotechenergy.com> wrote:
>> We just did a system on 10 degree AET and liked it. I think they have a 30 degree option. I'd be worried about inter-row shading, though. 
>> 
>> The DPW POWER-FAB BRM has more flexibility with row spacing, but I found it to be pretty expensive. 
>> 
>> Dana
>> 
>> Dana Brandt
>> Ecotech Energy Systems, LLC
>> www.ecotechenergy.com
>> dana at ecotechenergy.com
>> 360.318.7646
>> 
>> 
>> On Tue, Aug 28, 2012 at 1:56 PM, Glenn Burt <glenn.burt at glbcc.com> wrote:
>> Hi Ryan,
>> 
>>  
>> 
>> We have used the AET Rayport stainless steel ballasted racking system on dozens of installations and have been quite satisfied with the light ballast required (all open racking), integral module grounding, lightweight of materials (pressed stainless steel) and quickness of assembly.
>> 
>>  
>> 
>> http://aetenergy.com/products/RAYPORT-B-solar-mount-solution
>> 
>>  
>> 
>> Glenn Burt
>> 
>> glb, Consulting Company
>> 
>>  
>> 
>> From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Ryan Harkins
>> Sent: Tuesday, August 28, 2012 2:32 PM
>> To: RE-wrenches
>> Subject: [RE-wrenches] Ballasted Roof Racking Recommendations?
>> 
>>  
>> 
>> Anyone have recommendations for a ballasted roof racking manufacturer?  Tilts of 30-degrees or more would be best.  
>> 
>>  
>> 
>> Ryan Harkins
>> NABCEP Certified Solar PV Installer /
>> Project Manager
>>          
>> 
>> 
>> 
>> 
>> _______________________________________________
>> List sponsored by Home Power magazine
>> 
>> List Address: RE-wrenches at lists.re-wrenches.org
>> 
>> Options & settings:
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>> 
>> 
>> 
>> _______________________________________________
>> List sponsored by Home Power magazine
>> 
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>> 
>> 
>> 
>> 
>> -- 
>> Bill Hoffer PE
>> NABCEP Certified Solar PV Installer?
>> Sunergy Engineering Services PLLC
>> 2504 Columbia Ave NW
>> East Wenatchee WA 98802-3941
>> SunEngSer at gmail.com Cell:(509)679-6165
>> 
>> 
>> _______________________________________________
>> List sponsored by Home Power magazine
>> 
>> List Address: RE-wrenches at lists.re-wrenches.org
>> 
>> Options & settings:
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>> Check out participant bios:
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>Message: 8
>Date: Fri, 31 Aug 2012 22:13:12 -0600
>From: benn kilburn <benn at daystarsolar.ca>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Ballasted Roof Racking Recommendations?
>Message-ID: <CC66E6E6.1C1ED%benn at daystarsolar.ca>
>Content-Type: text/plain; charset="us-ascii"
>
>Ray,
>Are those the BIPV ones?
>Can you provide a model or a link?
>Thanks,
>Benn
>
>DayStar Renewable Energy Inc.
>www.daystarsolar.ca  *  Ph: 780-906-7807
>Construction Electrician Solar Photovoltaic Systems Certified
>Certificate # 0007S
>HAVE A SUNNY DAY
>
>On 31/08/12 9:43 PM, "R Ray Walters" <ray at solarray.com> wrote:
>
>Sunpower has just that.  Very easy install, no grounding issues, super high
>efficiency. Downsides: expensive, Plastic, finicky layouts from their
>engineers that preclude using it on smaller roofs.
>
> I would use it again for a larger roof that needed to max out the output/
>sq ft of roof.  It's probably the best commercially available module in the
>world, definitely the most efficient.  Last I checked it qualified as
>American made, though some of it is made in indonesia I believe.
>
>Ray Walters
>
>
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>Message: 9
>Date: Fri, 31 Aug 2012 23:19:01 -0500
>From: David Brearley <david.brearley at solarprofessional.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Ballasted Roof Racking Recommendations?
>Message-ID:
>	<BB29B71E-1B20-4336-8940-58FC9C382020 at solarprofessional.com>
>Content-Type: text/plain; charset="us-ascii"
>
>Here's a link:
>
>http://us.sunpowercorp.com/commercial/products-services/rooftop-solar-systems/T5/
>
>On Aug 31, 2012, at 11:13 PM, benn kilburn wrote:
>
>> Ray,
>> Are those the BIPV ones?
>> Can you provide a model or a link?
>> Thanks,
>> Benn
>> 
>> DayStar Renewable Energy Inc. 
>> www.daystarsolar.ca  *  Ph: 780-906-7807 
>> Construction Electrician Solar Photovoltaic Systems Certified
>> Certificate # 0007S
>> HAVE A SUNNY DAY
>> 
>> On 31/08/12 9:43 PM, "R Ray Walters" <ray at solarray.com> wrote:
>> 
>> Sunpower has just that.  Very easy install, no grounding issues, super high efficiency. Downsides: expensive, Plastic, finicky layouts from their engineers that preclude using it on smaller roofs.
>> 
>>  I would use it again for a larger roof that needed to max out the output/ sq ft of roof.  It's probably the best commercially available module in the world, definitely the most efficient.  Last I checked it qualified as American made, though some of it is made in indonesia I believe.
>> 
>> Ray Walters
>> 
>
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>------------------------------
>
>Message: 10
>Date: Sat, 1 Sep 2012 08:35:25 -0400
>From: "Rich Nicol" <rich at solartechvt.com>
>To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
>Subject: [RE-wrenches] Grid tie with BB
>Message-ID: <002801cd883e$46cc33b0$d4649b10$@solartechvt.com>
>Content-Type: text/plain; charset="us-ascii"
>
>Wrenches,
>
>I'm have a mental block with battery backup systems such as the Outback
>Radian. Perhaps someone can help me get over it!
>
>Essentially these systems sell back power off the top of the battery bank
>and the array is maintaining the state of charge of the battery bank through
>traditional charge controllers. If you have a modest battery bank sized for
>limited use on critical circuits and a good size array for the benefit of
>net metering I would think it would be necessary to limit the current the
>charge controllers are capable of delivering to the battery bank to prevent
>damage to the batteries when the controllers are Bulking or Absorbing, but
>then it would seem that we limiting the utility of the larger array. If the
>current from the controllers was not limited they will self-limit as voltage
>rises, plus I suppose they will mostly be in float mode except when the
>batteries are cycled but again it seems that we are limiting the capability
>of the array compared to a straight grid tied system with a traditional grid
>tied only inverter.
>
>An example would be a 8000 watt array using a couple of flexmax80
>controllers with a string of 8 - L16 AGMs feeding a  Radian.
>
>What am I missing here?
>
>Thanks 
>
>Rich
>
> 
>
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>
>Message: 11
>Date: Sat, 1 Sep 2012 10:43:07 -0600
>From: "Larry Crutcher,	Starlight Solar Power Systems"
>	<larry at starlightsolar.com>
>To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>Subject: Re: [RE-wrenches] Grid tie with BB
>Message-ID: <B2A9B879-B459-49D8-A5C6-B171D6579796 at starlightsolar.com>
>Content-Type: text/plain; charset="windows-1252"
>
>Rich,
>
>In your example you have 8kW feeding a 20kWh battery (assuming 400AH bat). This is about 0.4C charge rate. If these were flooded batteries, I might consider limiting bulk current to 0.2C because in standby use they do not need to be fully recharged in one day. Slow battery charging promotes longer life.
>
>Since you mention that these are AGM I would not worry about the excess current, especially in a stand by configuration. Some AGM manufacturers publish that you can provide charge current up to 5C without harm. For your bank that would be 2000 amps at 57Vdc! I believe all good quality AGM's can withstand high bulk charge currents because of the efficient way hydrogen and oxygen are recombined. Controlling voltage is the more important factor. So I don't think you are missing anything.
>
>Larry Crutcher
>Starlight Solar Power Systems
>
>
>
>
>On Sep 1, 2012, at 6:35 AM, Rich Nicol wrote:
>
>Wrenches,
>I?m have a mental block with battery backup systems such as the Outback Radian. Perhaps someone can help me get over it!
>Essentially these systems sell back power off the top of the battery bank and the array is maintaining the state of charge of the battery bank through traditional charge controllers. If you have a modest battery bank sized for limited use on critical circuits and a good size array for the benefit of net metering I would think it would be necessary to limit the current the charge controllers are capable of delivering to the battery bank to prevent damage to the batteries when the controllers are Bulking or Absorbing, but then it would seem that we limiting the utility of the larger array. If the current from the controllers was not limited they will self-limit as voltage rises, plus I suppose they will mostly be in float mode except when the batteries are cycled but again it seems that we are limiting the capability of the array compared to a straight grid tied system with a traditional grid tied only inverter.
>An example would be a 8000 watt array using a couple of flexmax80 controllers with a string of 8 - L16 AGMs feeding a  Radian.
>What am I missing here?
>Thanks
>Rich
> 
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>End of RE-wrenches Digest, Vol 5, Issue 275
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