<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 Mac,<div class=""><br class=""></div><div class="">Sunpower used to have a white paper that showed positive ground was only needed above a certain voltage. Like 200v+ from memory.</div><div class=""><br class=""></div><div class="">I don\u2019t know if these particular modules would fall into that category.</div><div class=""><br class=""></div><div class="">jay</div><div class=""><br class=""></div><div class="">peltz power</div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jan 20, 2018, at 9:59 AM, Jerry Shafer <<a href="mailto:jerrysgarage01@gmail.com" class="">jerrysgarage01@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><div class="">Mac<br class=""></div>I have used the sunpower 318 on trailers with the outback charge controller FM-60, which was wired for positive ground. However this was the only power on board, did not have any issues when connected to the truck or via the outback PS 2 except when I connected the laptop to the Mate 3 and had it plugged it to the inverter power, this would pop the GFI, I used an optical interface to prevent this from happening. I will say the Outback is more expensive then the panel so it may not be worth it.<br class=""></div>Jerry<br class=""></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Sat, Jan 20, 2018 at 3:43 AM, Mac Lewis <span dir="ltr" class=""><<a href="mailto:maclewis1@gmail.com" target="_blank" class="">maclewis1@gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="">Hi Wrenches,<div class=""><br class=""></div><div class="">I have a buddy that would like to use a leftover SunPower E20-327-C-AC, panel on his RV. Obviously he would need to take the inverter off. What I'm not sure of is if this panel can operate in an ungrounded configuration, or negative ground or does this still need a positive ground? If it does need a positive ground, are there any decent MPPT charge controllers that are fully isolated from PV to battery side, that would allow PV + ground and Battery - ground?</div><div class=""><br class=""></div><div class="">Thanks<span class="HOEnZb"><font color="#888888" class=""><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div class="m_-9163084289110836735gmail_signature"><div class=""><br class=""></div><div class=""><font face="'times new roman', serif" color="#305A78" class=""><br class=""></font></div><div class=""><br class=""></div>Mac Lewis<br class=""><br class=""><span style="font-family: "Times New Roman"; font-size: inherit; color: rgb(255, 153, 0);" class=""><b class=""><font size="3" face="Arial, Helvetica, sans-serif" class=""><p align="left" class=""><font face="Verdana, Arial, Helvetica, sans-serif" class=""><span style="font-size:small" class=""><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)" class=""><font face="'times new roman', serif" class="">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)" class=""><font face="'times new roman', serif" class="">-Sócrates</font></span></span></span></font></p></font></b></span></div>
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