[RE-wrenches] unique battery bank design question

[Larry Crutcher, Starlight Solar Power Systems]

There is only one 12 volt tap and one 24 volt tap plus ground. Picture two 12 volt batteries in series for 24 volts with the center going to the 12 volt tap. The only other positive voltage source is the 24 volt connection. The equalizer pulls from that terminal to maintain equilibrium between the two batteries.
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For 48 volt to 24 or 12 volt conversion we sell the IDC converters from Samlex America. http://www.samlexamerica.com/products/subcategory.asp?CategoryID=5&packagetype=13

Larry




On Sep 2, 2011, at 11:10 AM, Michael Welch wrote:

> I am merely a solar bozo.
> 
> One correction, I think it "shares" current from the second 12 V tap, not the 24 V tap.
> 
> I do not know if the equipment is capable of an equalizing scheme whereby it can tap 12 V and 24 V off the same 48 V string (per the original question in this thread), but a quick call to Vanner would provide answers. 
> 
> Larry Crutcher, wrote at 10:26 AM 9/2/2011:
> 
>> Correct. As a mobile RE dealer and service center, I see quite a few 24 volt systems with Vanner or other equalize type converters. As 12 volt current increases it causes one battery voltage to drop. The equalizer then shares current from the 24 volt tap to the 12 volt tap to maintain equal voltage across the two batteries. I'm not sure I said it better the Michael, just different for more clarity.
>> 
>> Are you sure you are not a REAL wrench?
>> 
>> Larry
>> Starlight Solar Power Systems
>> 
>> On Sep 2, 2011, at 9:45 AM, Michael Welch wrote:
>> 
>>> What the Vanner Voltmaster equalizer does is track the voltage differences between two parts of the string, and provides current from the other part to the first part when needed. If a tap decreases the voltage in part of the string, the other part of the string is used to help make up for it -- equalizing the two. 
>>> 
>>> Gosh, I hope I described that well enough, not being a real wrench and all.
>>> 
>>> http://www.vanner.com/battery-equalizers/
>>> 
>> 
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