Wrenches One thing to consider is that a good charge controller will cost more then a few modules so in most cases now with the current pricing is to remove and replace with new, I would like to keep the old ones in play with what ever is controlling them but build the new array, stack them up with a FM 80 and forget about it. if you customer is looking long term, I bet that they would understand and go for it. Jerry
On Thu, Jun 23, 2016 at 3:04 AM, Jesse Dahl <dahlso...@gmail.com> wrote: > Attached are two photos. One shows the IV curve of two dissimilar modules > in series and the other shoes them in parallel. > > On Wed, Jun 22, 2016 at 12:37 PM, Daniel Tittmann <dan...@greenwired.com> > wrote: > >> In the rough and tumble world of off grid system management for people >> who have been piecing together systems for years it is not uncommon for our >> company to come to a project and find many different types of solar >> modules. In most cases these modules are working fine and producing power >> but often have different output profiles. In an effort to upgrade systems >> and increase production I have often had the idea of building string of >> these different modules and feeding them into an MPPT controller. >> >> Can anyone out there explain if this would be a good idea or a bad one? >> >> Let say we have >> 4 x 100 watt 17.5 Vmp modules >> 2 x 245 watt 30.5 Vmp modules >> >> what would be the outcome of 2 strings of modules >> both with: 2 x 100 watt + 1 x 245 watt >> would this cause issues with the MPPT controller (say OB FM60) or the >> modules? Obviously you need to build strings that will fit the profile of >> the controller and not over to the series string rating and voltage >> tolerance of the modules but from a production standpoint where does this >> land? >> >> thanks for your advice >> Cheers- >> Daniel >> >> >> >> Daniel Tittmann >> CTO >> Greenwired >> www.greenwired.com >> dan...@greenwired.com >> 707-923-2001 (office) >> 707-206-5088 (Cell) >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >> > > > -- > Jesse Dahl > > RE-Power LLC > NABCEP - PV Installation Professional > NABCEP - PV Technical Sales > MREA - PV Site Assessor > Solar PV Instructor - Hibbing Community College > IBEW Local 292 > 218-235-0167 > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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