Ray: I believe either a MPPT or PWM charge controller will work. I say I believe because IndOp is new and we actually designed it to work with MPPT inverters. It should work with PWM as well but I have only tried it with one PWM charge controller (Morningstar) and that worked fine. Until we get some experience out there I don't want to over promise but in theory it should be fine.
Another option is to use IndOp connected directly to the battery and a separate diversion regulator. Since failure of a diversion regulator can create serious problems some backup is highly recommended (also required by NEC). Best Regards, John Berdner General Manager, North America [cid:image001.jpg@01CDFAC6.C81684C0] 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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Ray Walters Sent: Thursday, January 24, 2013 2:29 PM To: RE-wrenches Subject: Re: [RE-wrenches] 24V Module Query 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 [cid:image001.jpg@01CDFAC6.C81684C0] 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-boun...@lists.re-wrenches.org<mailto:re-wrenches-boun...@lists.re-wrenches.org> [mailto:re-wrenches-boun...@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 al...@positiveenergysolar.com<mailto:al...@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/> CONFIDENTIALITY NOTICE: This e-mail and its attachments are intended only for the use of the individual or entity who is the intended recipient and may contain information that is privileged, confidential and exempt from disclosure or any type of use under applicable law. If the reader of this e-mail is not the intended recipient, or the employee, agent, or representative responsible for delivering the e-mail to the intended recipient, you are hereby notified that any dissemination, distribution, copying, or other use of this e-mail is strictly prohibited. If you have received this e-mail in error, please reply immediately to the sender. P Please think of the environment before printing this email _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org> CONFIDENTIALITY NOTICE: This e-mail and its attachments are intended only for the use of the individual or entity who is the intended recipient and may contain information that is privileged, confidential and exempt from disclosure or any type of use under applicable law. 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