<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">HI Ash,<div class=""><br class=""></div><div class="">You don’t give a lot of data to the system, tilt, orientation, probably its 12 in series ( probably?), location, or room available for added modules, how difficult to add new wires or are the wires off the roof large enough to handle another string of modules, does the inverter have good ventilation if its going to be worked hard.</div><div class=""><br class=""></div><div class="">So depending on answers to all that, I might consider just adding 12 more 190 watt 72 cell/44voc modules in parallel. </div><div class="">I’d check with SMA to see if that is going to be any issue with the inverter as that is up around 4000 watts.</div><div class="">or you could remove 2 modules and then make 2 sets of 10 modules, which would be around 3550 watts. </div><div class=""><br class=""></div><div class="">I’m just not a big fan of removing already installed working parts. </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">jay</div><div class=""><br class=""></div><div class="">Peltz power</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 21, 2016, at 12:47 PM, Ash Bowersock <<a href="mailto:Ash.Bowersock@rgsenergy.com" class="">Ash.Bowersock@rgsenergy.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Good day RE Wrench crew,<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">I’ve got a client whom installed a 2kW array with a 3kW SunnyBoy inverter a number of years back. Due to the age of the system I assume it is single MPPT. The client oversized his inverter in the hopes of using it for this future expansion (and unfortunately his installer went along with it). The original modules were 12 SolarWorld 175’s I believe, and we would be looking at adding SolarWorld 280’s more than likely. To me it is clear that this is poor design practice and not something I am willing to do. My recommendation is a micro-inverter system that we tie in w/his existing using an AC Combiner. But the client wants to know exactly why we don’t want to just add a second string of 12 SolarWorld 280’s to his 6 year old SunnyBoy inverter.<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Can someone please give me a technical reason why mixed modules on a string inverter is “poor design practice”?<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">The more technical and dry an explanation, the better ;)<span class="Apple-converted-space"> </span><o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">If you can’t convince them, bore them to tears with the details.<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="background-color: white; background-position: initial initial; background-repeat: initial initial;"><tbody class=""><tr class=""><td valign="top" style="padding: 0in;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 14pt; font-family: 'Baskerville Old Face', serif; color: rgb(153, 153, 153);" class="">Ash Bowersock</span><span style="color: rgb(31, 73, 125);" class=""><br class=""></span><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(153, 153, 153);" class="">Senior System Designer<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><a href="http://www.rgsenergy.com/" style="color: rgb(149, 79, 114); text-decoration: underline;" class=""><span style="font-family: '.HelveticaNeueInterface-M3'; color: blue; text-decoration: none;" class=""><img border="0" width="349" height="83" id="_x0000_i1025" src="http://rgsenergy.com/images/new_rgs_energy-cpbs.png" alt="RGS Energy" class=""></span></a><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(153, 153, 153);" class=""><o:p class=""></o:p></span></div></td></tr><tr class=""><td valign="top" style="padding: 5.25pt 0in 3pt;" class=""></td></tr><tr class=""><td valign="top" style="padding: 0in;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(153, 153, 153);" class="">833 W. 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