Argh...this is an ongoing, as in years' long, pain point with my long time SunPower friends. <div><br></div><div>They've been looking into a device that would go between the old style non-Maxeon cell module strings and TL inverter that would effectively dissipate the polarization charge every night. And we've been waiting for several years for them to release this product. As to when it will actually be available for distribution, I don't know. </div><div><br></div><div>From my experience, this surface polarization phenomenon (when the strings are not + grounded) can mean an output hit of 25 or more percent. </div><div><br></div><div>On the bright side, even though such an array may not have had a + ground for years, we've seen the polarization dissipate after getting grounded and the output go back to expected levels.</div><div><br></div><div>marco<br><div><br></div><div><br><br>On Wednesday, October 14, 2020, <<a href="mailto:louis@solarcowboyz.com">louis@solarcowboyz.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><span style="font-family:Verdana;color:#000000;font-size:10pt"><div>Looking for feedback on the following, any help would be appreciated;</div><div><br></div><div>Positive grounded arrays(Sunpower systems) what is being used as an Inverter replacement?</div><div>Hard to get SMA's SBxxxxUS older style units that have the built-in POS/NEG grounding capability...</div><div>As far as I know the newer line of Inverters from SMA will not work ; they are TL's and are not compatible.</div><div><br></div><div>It would be tempting to "Un-Ground" the array and use the newer line of TL Inverters from SMA.</div><div>The Discon would need to do both POS/NEG lines;OK</div><div>I know of this being done with Arrays that are NEG grounded.</div><div><br></div><div>How much of a Power loss from the array would be expected due to removing the POS ground on Sunpower panels and run them Un-grounded ?</div><div>Guessing say 15 to 20% ?</div><div><br></div><div>This may be a solution that the customer would go along with short of replacing the entire system.</div><div><br></div><div><br></div><div><br></div><div><br></div><div>Best Regards</div><div>Louis Segarra </div><div>Tech Department/Field Operations</div><div>Solar Cowboyz</div><div>(530) 273-4895</div><div>(916) 212-0282</div> </span></div>
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