Darryl has a good point. I've intentionally shaded my array (9 modules in series) and have seen the VDC drop from 225vdc or so to around 170ish. Basic string sizing with these modules and this inverter say 8 is the minimum number of modules, but 8 would drop me out of MPPT during shade issues, which I have.
Jesse Sent from my iPhone On Oct 21, 2012, at 9:22 PM, Darryl Thayer <daryl_so...@yahoo.com> wrote: > thanks David, Well spoken (I would add the words after ", you have many > strings of 3 modules in series" the words (connected in parallel)" > > I have found one other tigo trick, If you are supplying an inverter with a > short string, and some modules or even one module is shaded the inverter can > drop out of MPPT range of the modules greatly reducing the power of the > string. So you have to do string sizing with reduced voltage from the Tigo's > in mind. > > Darryl, > BTW I am out of hospital after 90 days looking forward to full recovery by > spring, Hi everyone, I seem to have made it. > > > From: David Katz <dk...@aeesolar.com> > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > Sent: Wednesday, October 17, 2012 11:34 AM > Subject: Re: [RE-wrenches] Tigo Tech Support Response > > Larry and Dan, > Jacob’s response is a bit misleading. Tigo Maximizers operate in the buck > mode, by lowering the voltage of a shaded module and increasing the current > to match other modules in a string, so the unshaded modules are not affected. > If you use Maximizers in an off grid situation, you must still have enough > voltage to charge the battery. If you are using a typical 150 vdc input > charge controller with 3 modules in series, you could still charge the > battery on the voltage of 2-1/2 modules in series. More typically in an off > grid system, you have many strings of 3 modules in series. If one has a > lower voltage because of Maximizer operation, it will be ignored by the > charge controller which will be tracking the full voltage strings. > If you want to use Maximixers in an off grid situation, I suggest using them > with a Xantrex 600 vdc charge controller and one or two strings of modules. > > David Katz > CTO & Founder > AEE Solar Inc > P: 707 825-1200 > F: 707 825-1202 > dk...@aeesolar.com > www.aeesolar.com > DISCLAIMER: > This communication, along with any documents, files or attachments, is > intended for the use of only the addressee and contains privileged and > confidential information. If you are not the intended recipient, you are > hereby notified that any dissemination, distribution or copying of any > information contained in or attached to this communication is strictly > prohibited. If you have received this message in error, please notify the > sender immediately by e-mail reply and destroy the original communication and > its attachments without reading, printing or saving in any manner. > > > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Larry > Crutcher, Starlight Solar Power Systems > Sent: Wednesday, October 17, 2012 7:16 AM > To: RE-wrenches > Subject: Re: [RE-wrenches] Tigo Tech Support Response > > Dan, > > Thanks for posting this. I am fascinated and puzzled with their response. Why > would they not advertise this point? I see nothing on their site that > suggests the Module Maximizer functions with off-grid PV systems. Many > battery based systems that we have installed over the years certainly could > benefit from their technology and the monitoring. > > Has anyone ever used the Tigo Maximizers with a battery based system? > > Larry Crutcher > Starlight Solar Power Systems > > > > > On Oct 16, 2012, at 5:25 PM, <d...@foxfire-energy.com> > <d...@foxfire-energy.com> wrote: > > Hi Guys, following is the response from Tigo on the question of using their > optimizers for battery charging: > > Hello Dan > > Thank you for the phone call yesterday. I have answers to some of your > questions. > > - At the moment, we only sell arc fault detection services to combiner box > manufacturers to incorporate into their combiner boxes. However, in a short > amount of time (estimates say about a month), we will offer string level arc > fault detection. > > - The maximizers will work just fine with batteries/charge controllers ONLY > if the battery/charge controller has an MPPT input. There are those out there > that do not have this type of input, so be sure to purchase accordingly. > > - We do offer module level monitoring. > > Thanks and let me know if you have any other questions! > > --------------------------------- > Regards, > > Jacob Jackson > Tech Support Engineer > Tigo Energy > > > db > > Dan Brown > Foxfire Energy Corp. > Renewable Energy Systems > (802)-483-2564 > www.Foxfire-Energy.com > NABCEP #092907-44 > _______________________________________________ > List sponsored by Home Power magazine > > List Address: 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 > > Check out participant bios: > www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: 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 > > Check out participant bios: > www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: 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 > > Check out participant bios: > www.members.re-wrenches.org >
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