I have used the Sunpower 327 modules with Radian inverters and Charge controllers it does get connected backwards and it works fine, I have a mobile system that is also SunPowered with Outback FX inverters. Outback has a white paper on this type of application. Regarding the modules well good luck Jerry
On Wed, Aug 20, 2014 at 6:46 PM, Ray Walters <r...@solarray.com> wrote: > Greetings fellow Wrenches; > > I have a customer that just purchased some Sunpower E20 -435 modules > somehow from Ebay, and wants me to design a backup power system for him. > This system would be battery based and not be grid tied. SO the question > is: has Sunpower put to rest the positive grounding issue with these > modules? > I would want to either use a negative ground system or go ungrounded, as > the charge controllers and battery based inverter do not play well with a > positive grounded system. > My idea is that I could run these modules at lower voltage, either all in > parallel (85.6 Voc) or 2 in series (191 Voc) with Midnite Classic > controllers, and that the whole surface polarization issue will be > minimized at these lower voltages. > I know this came up before, and Sunpower basically said they would revoke > their warranty for any battery based systems, (which is why I'm no longer a > Sunpower dealer.... :) > Don't the newer Sunpower modules no longer need positive ground, and if > so, which models is this true for? In this case, the warranty is already > suspect, so that's not an issue. It just has to work safely. > > Thanks in advance for your help, > > -- > R.Ray Walters > CTO, Solarray, Inc > Nabcep Certified PV Installer, > Licensed Master Electrician > Solar Design Engineer > 303 505-8760 > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. > org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > >
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