[RE-wrenches] SW master & slave

[Dana]

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"

P Please consider the environment before printing this email

 

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
 <mailto:Allan at positiveenergysolar.com> 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 <http://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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