[RE-wrenches] Charging Multiple Battery Banks

Wed Mar 25 10:24:52 PDT 2015

Hi Jeremy;

I usually would combine both buildings all into one system, KISS 
principle, and also less cost. Later when those batteries die, replace 
with a properly sized bank.  I also wouldn't be building a new system 
around an SW4024, those are getting really dated. Great inverter, but 
they don't last forever.  They have excellent resell value on Ebay for 
folks that need replacements in dual and quad systems.
Having said that, Jerry's idea of 2 controllers on one array sounds like 
it would work, but not with Blue Sky because of the grounding as Larry 
mentioned.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 3/25/2015 10:36 AM, Larry wrote:
> Keep in mind that the Midnite controller has a combined PV and bat. 
> negative and the Blue Sky requires isolated PV and bat. negative.
> Larry Crutcher
> Starlight Solar Power Systems
> On 3/24/15 6:11 PM, Jeremy Rodriguez wrote:
>> The thought was to charge the batteries for a new building utilizing 
>> an SW4024 with new classic controller and new L A batteries, and once 
>> those batteries are charged send the PV to the house system which is 
>> the 48v setup with dual outback inverters and dual SB3048 CCs.  Lead 
>> acid batteries as well. 3 years old
>> I've never had this come up in 16 years!
>>
>>
>> Jeremy Rodriguez
>> All Solar, Inc.
>> 1463 M
>> Penrose Colorado 81240
>>
>> Sent by Jeremy's iPhone. Sorry for typos and shorthand!
>>
>> On Mar 24, 2015, at 5:31 PM, "Ray Walters" <ray at solarray.com 
>> <mailto:ray at solarray.com>> wrote:
>>
>>> What's the reasoning behind two different battery banks at different 
>>> voltages? What is the other equipment involved: batteries type, age, 
>>> inverters, etc.?
>>> R.Ray Walters
>>> CTO, Solarray, Inc
>>> Nabcep Certified PV Installer,
>>> Licensed Master Electrician
>>> Solar Design Engineer
>>> 303 505-8760
>>> On 3/24/2015 5:07 PM, Jeremy Rodriguez wrote:
>>>> It would be 2kw of PV
>>>>
>>>> Jeremy
>>>> All Solar
>>>> Penrose, CO
>>>>
>>>> ------------------------------------------------------------------------
>>>> Date: Tue, 24 Mar 2015 12:17:20 -1000
>>>> From: jerrysgarage01 at gmail.com
>>>> To: re-wrenches at lists.re-wrenches.org
>>>> Subject: Re: [RE-wrenches] Charging Multiple Battery Banks
>>>>
>>>> How big of a system are you looking at as some of the smaller 
>>>> charge controllers are auto sensing
>>>> Jerry
>>>>
>>>> On Tue, Mar 24, 2015 at 12:11 PM, Jeremy Rodriguez 
>>>> <allsolarjeremy at msn.com <mailto:allsolarjeremy at msn.com>> wrote:
>>>>
>>>>     Wrenches,
>>>>     I have a client that wants to charge a 24v battery bank and a
>>>>     48v bank with the same array. Different charge controllers,
>>>>     with some type of relay is what I was thinking, and using the
>>>>     controller's aux. 12v output for the relay control.
>>>>     The primary battery to be charged would be the 24v bank, then
>>>>     once it is fully charged, divert the pv to the secondary
>>>>     controller at the 48v bank.
>>>>
>>>>     Any comments or recommendations on this would be helpful.
>>>>
>>>>     Jeremy Rodriguez
>>>>     All Solar Inc.
>>>>     Penrose, CO
>>>>
>>>>     _______________________________________________
>>>>     List sponsored by Redwood Alliance
>>>>
>>>>     List Address: RE-wrenches at lists.re-wrenches.org
>>>>     <mailto:RE-wrenches at lists.re-wrenches.org>
>>>>
>>>>     Change listserver email address & settings:
>>>>     http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>>
>>>>     List-Archive:
>>>>     http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>>>     <http://www.mail-archive.com/re-wrenches%40lists.re-wrenches.org/maillist.html>
>>>>
>>>>     List rules & etiquette:
>>>>     www.re-wrenches.org/etiquette.htm
>>>>     <http://www.re-wrenches.org/etiquette.htm>
>>>>
>>>>     Check out or update participant bios:
>>>>     www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________ List sponsored by 
>>>> Redwood Alliance List Address: RE-wrenches at lists.re-wrenches.org 
>>>> Change listserver email address & settings: 
>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: 
>>>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html 
>>>> List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out 
>>>> or update participant bios: www.members.re-wrenches.org
>>>>
>>>>
>>>> _______________________________________________
>>>> List sponsored by Redwood Alliance
>>>>
>>>> List Address:RE-wrenches at lists.re-wrenches.org
>>>>
>>>> Change listserver email address & settings:
>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>>
>>>> List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>>>
>>>> List rules & etiquette:
>>>> www.re-wrenches.org/etiquette.htm
>>>>
>>>> Check out or update participant bios:
>>>> www.members.re-wrenches.org
>>>>
>>>
>>> _______________________________________________
>>> List sponsored by Redwood Alliance
>>>
>>> List Address: RE-wrenches at lists.re-wrenches.org 
>>> <mailto:RE-wrenches at lists.re-wrenches.org>
>>>
>>> Change listserver email address & settings:
>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>
>>> List-Archive: 
>>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>>
>>> List rules & etiquette:
>>> www.re-wrenches.org/etiquette.htm 
>>> <http://www.re-wrenches.org/etiquette.htm>
>>>
>>> Check out or update participant bios:
>>> www.members.re-wrenches.org <http://www.members.re-wrenches.org>
>>>
>>
>>
>> _______________________________________________
>> List sponsored by Redwood Alliance
>>
>> List Address:RE-wrenches at lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive:http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> www.members.re-wrenches.org
>>
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20150325/4c16d337/attachment-0002.html>