[RE-wrenches] Sunpower off grid?

[Jerry Shafer]

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 <ray at 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 at 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20140821/a1ef0f0e/attachment-0003.html>