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We end up doing a lot of off grid rewires, and one thing we do when combining new and old modules is to use 2 controllers. <div>We'll put the odd, old mismatched stuff on a used C40, and put the new modules on the MX60. </div><div>Every salvage module in the world has ended up here in Taos, and many have no documentation to even try to match them to new modules.<div>We still try and stock 12 v modules, but my store room has ended up with a real hodgepodge of singles.</div><div>We only sell 4 or 5 a year, so nostalgia aside, I'm considering finally dropping 12 v.<br><div><br></div><div><br></div><div><div>R. Walters</div><div>Solarray.com<span class="Apple-tab-span" style="white-space: pre; "></span></div><div>NABCEP # 04170442<span class="Apple-tab-span" style="white-space: pre; "> </span></div><div><div><br></div><div><br></div><div>On Dec 11, 2008, at 5:55 AM, Wind-sun.com wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <div><font face="Calibri" size="2">For larger off grid systems - pretty much anything over 600 watts - we have been recommending only MPPT type controllers, such as the Outback & Xantrex. Since they can match almost any panel size to any battery size, it has reduced our dependence on the often hard to get 12 volt panels.</font></div> <div><font face="Calibri" size="2"></font> </div> <div><br></div></blockquote></div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><br></div></span><div><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span> </div><br></div></div></div></body></html>