[RE-wrenches] 24V Module Query

Thu Jan 24 14:56:12 PST 2013

True, the 2512iX-HV model is for 12 volt systems only. The 1524iX will operate with 12 or 24 volt and can handle up to 57Voc. However, in the manual it recommends no more than 45.6 Voc for 24 volt operation with 33 to 37 volt modules. I'm guessing the conversion efficiency suffers outside that range.

Larry Crutcher
Starlight Solar Power Systems

On Jan 24, 2013, at 3:07 PM, Allan Sindelar wrote:

Larry,
Yes, but isn't it 12V-only output? When I called Rick Cullen to ask if he had anything to work with 60-cell modules, he told me only in 12V output, which we seldom encounter any more.
Thanks,
Allan

Allan Sindelar
Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder and Chief Technology Officer
Positive Energy, Inc.
3209 Richards Lane (note new address)
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com

On 1/24/2013 2:01 PM, Larry Crutcher, Starlight Solar Power Systems wrote:
> Blue Sky Energy just came out with a MPPT controller for 60 cell modules called the 2512iX-HV. It can handle up to 270 Watts input/60 cells and 340 Watts input with 36 cell modules.
> 
> Larry Crutcher
> Starlight Solar Power Systems
> 
> 
> 
> 
> On Jan 24, 2013, at 1:15 PM, Jay Peltz wrote:
> 
> Hi guys
> 
> I've buying the new 6" cell x 72 cell from Trina from a few suppliers. 
> Big yea, but same 44voc  so it's an easy add to existing systems. 
> 
> A huge relief. 
> 
> Jay
> 
> Peltz power
> 
> Sent from my iPhone
> 
> On Jan 24, 2013, at 12:11 PM, Ray Walters <ray at solarray.com> wrote:
> 
>> Hi Allan;
>> 
>> I've been in the same conundrum lately.  I found that AEE and others have 12 v modules (Solartech), but the price per watt is double or triple.  My take is that somewhere around 200 to 400 watts, its more cost effective to go to the GT modules with an MPPT controller.  Blue Sky makes the 1524, and 3024 that can take up to 57 Voc, so those would work at still fairly low cost.  Unfortunately many of the other low cost MPPT controllers won't work with the 60 cell modules.  At some point, it may actually be cost effective to just use 60 cell modules with non MPPT controllers, and just forget about the extra 24 cells.  (I know that sounds crazy, but PV less than $1/ watt is crazy too)
>> 
>> I'm trying to add modules to an existing array of 8 Siemens 12 v modules, and it just doesn't work out, except with separate controllers. 
>> Also, its amazing how much PV you can throw at an off grid project these days for $10k.
>> It almost makes messing around with the old modules a waste of time.
>> Perhaps the solution might be to remove old arrays for customers wanting to really up size, and then reuse the old modules for small systems?
>> 
>> Ray
>> 
>> On 1/24/2013 12:35 PM, Allan Sindelar wrote:
>>> Wrenches,
>>> We have years of installing 36-cell (12V) and 72-cell (24V) modules for battery-based customers. Most of our systems are 24V or 48V nominal. Over the last few years, sources of conventionally-sized 72-cell modules have dried up - as cells have increased in size, most modules and most newer factory production lines have either gone to 60-cell (20V) modules, or 72 cells in 300+ watt ranges. It seems that the formerly common 72 cell, 24V modules in the 150-190 watt range, which are well-suited to integrating into existing systems, are no longer available.
>>> 
>>> 60-cell modules in the common 220-250 watt range can't be added to an existing system unless run through a dedicated MPPT charge controller that can convert voltage, such as an FM, XW60, Classic or TriStar; the added cost of any of these controllers cancels out the low prices of the modules.
>>> 
>>> Who continues to manufacture 72-cell modules? Which distributors carry them?
>>>     I am aware of three options - are there more?
>>>     - Sunpower makes one module in the 245 watt range that can be used negative ground, but it's very high efficiency (and with high Voc/Vmp as well) and very pricey;
>>>     - Sanyo/Panasonic has 225-240 watt modules, but also quite premium and pricey;
>>>     - Ameresco bought the rights to manufacture many former BP modules, and I think they make some. But we had to replace lots of failed BP modules in that size range, and are hesitant to use their technology, fearing that the problems may persist in the continued line.
>>> 
>>> Thank you for any discussion and recommendations.
>>> Allan
>>> -- 
>>> Allan Sindelar
>>> Allan at positiveenergysolar.com
>>> NABCEP Certified Photovoltaic Installer
>>> NABCEP Certified Technical Sales Professional
>>> New Mexico EE98J Journeyman Electrician
>>> Founder and Chief Technology Officer
>>> Positive Energy, Inc.
>>> 3209 Richards Lane (note new address)
>>> Santa Fe, New Mexico 87507
>>> 505 424-1112
>>> www.positiveenergysolar.com
>>> 
>>> 
>>> 
>>> 
>>> 
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