[RE-wrenches] 24V Module Query

[Ray Walters]

Hi John;

Would we not need an MPPT controller, just a regular PWM type, then?  
That might be a solution for these democracy arrays.

Ray

On 1/24/2013 3:16 PM, John Berdner wrote:
>
> Alan:
>
> You can also use one of our Optimizers with IndOp.
>
> This will buck of boost the module voltage to match the battery voltage.
>
> Still would need some form of charge control to protect the battery 
> but this would provide an easy way to add new 60 cell modules to an 
> existing 72 cell array.
>
> Feel free to contact me if you have any questions.
>
> Best Regards,
>
> John Berdner
>
> General Manager, North America
>
> SmallBannerPictEngnew
>
> SolarEdge Technologies, Inc.
>
> 3347 Gateway Boulevard, Fremont CA 94538 USA */(*Please note of our 
> new address.)/*
> T: 510.498.3200, X 747
>
> M: 530.277.4894
>
> *From:*re-wrenches-bounces at lists.re-wrenches.org 
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of 
> *Allan Sindelar
> *Sent:* Thursday, January 24, 2013 11:35 AM
> *To:* RE-wrenches
> *Subject:* [RE-wrenches] 24V Module Query
>
> 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 <mailto: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 <http://www.positiveenergysolar.com/>
>
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