[RE-wrenches] SW master & slave

[Philip]

Either inverter will become the master at many times during the life of the system, likewise the slave. 

SW inverters didn't stack so much as live together under the same roof and stay 180 degrees out of the other's way. We've all seen marriages like that ;-)

Phil




On May 25, 2012, at 1:08 PM, "Dana" <dana at solarwork.com> wrote:

> If you totally power down do you always need to power up the “master” first or if you reverse the power up will the slave become the master now?
>  
>  
> Dana Orzel -  Great Solar Works, Inc -  E - dana at solarwork.com -  V 970.626.5253
> F - 970.626.4140     C - 970.209.4076     web - www.solarwork.com 
> "Responsible Technologies for Responsible People since 1988"
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> From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Allan Sindelar
> Sent: Friday, May 25, 2012 7:47 AM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] SW master & slave
>  
> 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
> Allan at 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
> 
>  
> 
> 
> 
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