<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">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><br><div id="AppleMailSignature" dir="ltr"><div><div id="AppleMailSignature"><span style="background-color: rgba(255, 255, 255, 0);">Jesse Dahl</span></div><div id="AppleMailSignature"><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div id="AppleMailSignature"><span style="background-color: rgba(255, 255, 255, 0);">NABCEP PV Installation Professional</span></div><div id="AppleMailSignature"><span style="background-color: rgba(255, 255, 255, 0);">IBEW Local 292 - Electrician </span></div><div id="AppleMailSignature"><span style="background-color: rgba(255, 255, 255, 0);">Electrical/Solar PV Instructor - HCC</span></div></div><div id="AppleMailSignature"><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div>Sent from my iPhone</div><div dir="ltr"><br>On Nov 22, 2018, at 12:10 AM, <<a href="mailto:bruce@willpowerelect.com">bruce@willpowerelect.com</a>> <<a href="mailto:bruce@willpowerelect.com">bruce@willpowerelect.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><span style="font-family:Verdana; color:#0033cc; font-size:10pt;"><div>Compadres,</div><div><br></div><div>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><br></div><div>Cheers,<br></div><div><br></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><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;">Bruce Fiero-RMI</span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;"><span style="font-size: 12pt;" mce_style="font-size: 12pt;"><span style="font-size: 10pt;" mce_style="font-size: 10pt;"><span style="font-size: 8pt;" mce_style="font-size: 8pt;"><span style="font-size: 10pt;" mce_style="font-size: 10pt;"><span style="font-size: 12pt;" mce_style="font-size: 12pt;"><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;"><span style="color: #355a8c;" mce_style="color: #355a8c;"><br></span></span></span></span></span></span></span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;"><span style="color: #355a8c;" mce_style="color: #355a8c;"><sigimg0></span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><b><span style="font-size: 10pt;" mce_style="font-size: 10pt;"><span style="color: #355a8c;" mce_style="color: #355a8c;"><br></span></span></b></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><span style="font-size: 8pt;" mce_style="font-size: 8pt;"><span style="color: #425f9e;" mce_style="color: #425f9e;"><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;"><span style="font-size: 10pt;" mce_style="font-size: 10pt;"><span style="color: #355a8c;" mce_style="color: #355a8c;"><b>"</b><i><b>Energizing the Rogue Valley"</b></i></span></span></span></span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><span style="color: #355a8c;" mce_style="color: #355a8c;"><br></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><span style="color: #225995; 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color: #425f9e;" mce_style="font-family: "times new roman", times; color: #425f9e;"><span style="color: #355a8c;" mce_style="color: #355a8c;"><b>P:</b> 541.535.3965<br><b>F:</b> 541.512.0061<br><b>E:</b> <a title="bruce@willpowerelect.com" href="mailto:bruce@willpowerelect.com" mce_href="mailto:bruce@willpowerelect.com" target="_blank">bruce@willpowerelect.com</a><br><b>W:</b> <a title="Willpower Electric, LLC" href="http://www.willpower-electric.com" mce_href="http://www.willpower-electric.com" target="_blank">Willpower Electric, LLC</a> </span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;"><span style="font-family: "times new roman", times;" mce_style="font-family: "times new roman", times;"><span style="color: #425f9e;" mce_style="color: #425f9e;"><span style="color: #355a8c;" mce_style="color: #355a8c;"><br></span></span></span></span></div><div style="font-family: verdana, geneva;" mce_style="font-family: verdana, geneva;"><span style="font-family: "times new roman", times; 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