[RE-wrenches] Charging Multiple Battery Banks

[Larry]

The Blue Sky should still work as long as he switches PV positive and 
negative. However, I like the idea of charging just the 24 volt system 
and feeding AC to the Outbacks to charge the 48 volt bank. A little more 
loss but mush easier to implement. You could easily control when AC is 
fed to the 48 volt system based on voltage of the 24 volt battery.

Larry

On 3/25/15 10:24 AM, Ray Walters wrote:
> 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
>>>>>

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