Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] _____ From: Peter Parrish [mailto:[EMAIL PROTECTED] Sent: Friday, November 21, 2008 9:10 AM To: 'RE-wrenches' Cc: 'Peter Parrish' Subject: DC Rating of Disconnects I am looking into using the PV Powered PVP2000 inverter for some small, low voltage designs. The string Voc will be around 200 Vdc, worst case. Since the PVP2000 doesn't come with a DC disconnect, I am wondered what other wrenches who install the PVP2000 have been doing about this. I hate to spend $150 on a 600 V AC/DC disco such as the SD HU361RB to provide the means of disconnection. I believe that the 240 V AC discos such as the SD DU221RB have no DC rating. >From an academic point of view, I wonder why the smaller discos are not dual rated, since we all know that the real-time voltage difference in a 240 V AC system can be 41% greater than 240 V. In any event, any Code-compliant solutions would be greatly appreciated. - Peter Peter T. Parrish, President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED]
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