<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">HI Bruce,<div class=""><br class=""></div><div class="">OB specifies 2000 watts STC max for the FM-80 at 24v. </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Gotta say I've never measured 3X solar irradiance, impressive.</div><div class=""><br class=""></div><div class="">jay</div><div class="">peltz power</div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 22, 2018, at 7:37 AM, Solar <<a href="mailto:dahlsolar@gmail.com" class="">dahlsolar@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class="">I live in Northern MN and we get very cold days (-50F +) and very crisp clear days when it\u2019s this cold. I\u2019ve seen 1333 WM2 on the same plane as my array with snow reflecting sun light. Using the daystar irradiance meter. I am at 1400\u2019 so your increased elevation with very cold temps, snow and edge of cloud could maybe cause it. Maybe a calculation of extremes could give you an idea. Rearrange the formula and get the irradiance needed to cause this high of watts. <div class=""><br class=""><div dir="ltr" class=""><div class=""><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Jesse Dahl</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><br class=""></span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">NABCEP PV Installation Professional</span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">IBEW Local 292 - Electrician </span></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Electrical/Solar PV Instructor - HCC</span></div></div><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class=""><br class=""></span></div>Sent from my iPhone</div><div dir="ltr" class=""><br class="">On Nov 22, 2018, at 12:10 AM, <<a href="mailto:bruce@willpowerelect.com" class="">bruce@willpowerelect.com</a>> <<a href="mailto:bruce@willpowerelect.com" class="">bruce@willpowerelect.com</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class=""><div dir="ltr" class=""><span style="font-family:Verdana; color:#0033cc; font-size:10pt;" class=""><div class="">Compadres,</div><div class=""><br class=""></div><div class="">I have 4 identical arrays of 3 strings of 3 Solarworld SW 245 mono (2010 model) to FM80s. When designing, not exceeding 150 voc was critical. No record temp data available. Location ~ 4,000' Pacific Northwest. Recently replaced an FM80 with 6 blown FETs showing max power at 3075 watts! This from a 2205 watt array into a 24 volt battery. Max historical voc is ~120. My guess at record low temp is -10F. tc%/ºC MPP doesn't get anywhere close. What would the WM2 need to be in order to achieve 3075 watts on a 2205 watt array? BTW, 2 of the four original chargers are still working fine and one of them also shows 3075 watts max power. Edge of cloud effect against snow field at bottom of array?</div><div class=""><br class=""></div><div class="">Cheers,<br class=""></div><div class=""><br class=""></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;" class=""><span style="color: #355a8c; font-family: "times new roman", times; font-size: 12pt;" mce_style="color: #355a8c; font-family: "times new roman", times; font-size: 12pt;" class="">Bruce Fiero-RMI</span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;" class=""><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;" class=""><span style="font-size: 12pt;" mce_style="font-size: 12pt;" class=""><span style="font-size: 10pt;" mce_style="font-size: 10pt;" class=""><span style="font-size: 8pt;" mce_style="font-size: 8pt;" class=""><span style="font-size: 10pt;" mce_style="font-size: 10pt;" class=""><span style="font-size: 12pt;" mce_style="font-size: 12pt;" class=""><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;" class=""><span style="color: #355a8c;" mce_style="color: #355a8c;" class=""><br class=""></span></span></span></span></span></span></span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;" class=""><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;" class=""><span style="color: #355a8c;" mce_style="color: #355a8c;" class=""><sigimg0></span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;" class=""><b class=""><span style="font-size: 10pt;" mce_style="font-size: 10pt;" class=""><span style="color: #355a8c;" mce_style="color: #355a8c;" class=""><br class=""></span></span></b></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;" class=""><span style="font-size: 8pt;" mce_style="font-size: 8pt;" class=""><span style="color: #425f9e;" mce_style="color: #425f9e;" class=""><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;" class=""><span style="font-size: 10pt;" mce_style="font-size: 10pt;" class=""><span style="color: #355a8c;" mce_style="color: #355a8c;" class=""><b class="">"</b><i class=""><b class="">Energizing the Rogue Valley"</b></i></span></span></span></span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;" class=""><span style="color: #355a8c;" mce_style="color: #355a8c;" class=""><br class=""></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;" class=""><span style="color: #225995; 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