Re: [RE-wrenches] SW master & slave

[Allan Sindelar]

Mac, Unlike the later Outback, for which you designate a master, the SWs had no way to do such designation. I think that when you boot them up (apply DC power), whichever unit receives power first becomes the master, and the other becomes the slave. According to the manual, the issue of master/slave generator control applies only to parallel-stacked inverters operating at 120V  AC output with a SWI/PAR stacking cable, and not with series stacking (120/240 VAC) configuration. Page 96: When using two units in parallel, it is recommended that only the SLAVE inverter be used to control the generator. This is required because the generator control system includes a cool down timer that causes the controlling inverter to disconnect from the generator before it turns the generator off. If the MASTER controls the generator, then the SLAVE may not stay in sync with the MASTER during the cool-down period since it will remain in sync with the generator and not follow the MASTER. There currently is no adjustment for the cool-down period, so restricting the generator control to the SLAVE is the only solution available at this time. Allan Allan Sindelar al...@positiveenergysolar.com NABCEP Certified Photovoltaic Installer NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder and Chief Technology Officer Positive Energy, Inc. 3209 Richards Lane (note new address) Santa Fe, New Mexico 87507 505 424-1112 www.positiveenergysolar.com On 5/25/2012 7:16 AM, mac Lewis wrote: Hello wrenches, I recently series stacked two SW 4024s.  Everything seems to work fine.  I want to follow the recommendation that the slave device is the generator controlling inverter.  How do I tell which is the master and which is the slave? Thanks -- Mac Lewis "Yo solo sé que no sé nada." -Sócrates _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org

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