<div dir="ltr"><div>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<br>
</div>Jerry<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Aug 20, 2014 at 6:46 PM, Ray Walters <span dir="ltr"><<a href="mailto:ray@solarray.com" target="_blank">ray@solarray.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Greetings fellow Wrenches;<br>
<br>
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.<br>
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?<br>
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.<br>
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.<br>
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.... :)<br>
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.<br>
<br>
Thanks in advance for your help,<br>
<br>
-- <br>
R.Ray Walters<br>
CTO, Solarray, Inc<br>
Nabcep Certified PV Installer,<br>
Licensed Master Electrician<br>
Solar Design Engineer<br>
<a href="tel:303%20505-8760" value="+13035058760" target="_blank">303 505-8760</a><br>
<br>
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