<div dir="ltr"><div><div>Wrenches<br></div>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.<br></div>Jerry<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 23, 2016 at 3:04 AM, Jesse Dahl <span dir="ltr"><<a href="mailto:dahlsolar@gmail.com" target="_blank">dahlsolar@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif">Attached are two photos. One shows the IV curve of two dissimilar modules in series and the other shoes them in parallel. </div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Wed, Jun 22, 2016 at 12:37 PM, Daniel Tittmann <span dir="ltr"><<a href="mailto:daniel@greenwired.com" target="_blank">daniel@greenwired.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr"><div><div data-smartmail="gmail_signature"><div>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. </div><div><br></div><div>Can anyone out there explain if this would be a good idea or a bad one? </div><div><br></div><div>Let say we have </div><div>4 x 100 watt 17.5 Vmp modules </div><div>2 x 245 watt 30.5 Vmp modules</div><div><br></div><div>what would be the outcome of 2 strings of modules</div><div>both with: 2 x 100 watt + 1 x 245 watt </div><div>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?</div><div><br></div><div>thanks for your advice</div><div>Cheers-</div><div>Daniel</div><span><font color="#888888"><div><br></div><div><br></div><div dir="ltr"><br></div><div dir="ltr">Daniel Tittmann <div>CTO</div><div>Greenwired</div><div><a href="http://www.greenwired.com" target="_blank">www.greenwired.com</a></div><div><a href="mailto:daniel@greenwired.com" target="_blank">daniel@greenwired.com</a></div><div><a href="tel:707-923-2001" value="+17079232001" target="_blank">707-923-2001</a> (office)</div><div><a href="tel:707-206-5088" value="+17072065088" target="_blank">707-206-5088</a> (Cell)</div></div></font></span></div></div>
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<br></span></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div data-smartmail="gmail_signature"><div dir="ltr">Jesse Dahl<div><br></div><div>RE-Power LLC</div><div>NABCEP - PV Installation Professional </div><div>NABCEP - PV Technical Sales</div><div>MREA - PV Site Assessor</div><div>Solar PV Instructor - Hibbing Community College</div><div>IBEW Local 292</div><div><a href="tel:218-235-0167" value="+12182350167" target="_blank">218-235-0167</a></div><div><br></div></div></div>
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