[RE-wrenches] SW 4024 now grid tie
Allan Sindelar
allan at positiveenergysolar.com
Wed Nov 18 22:38:21 PST 2009
There is no reason that the two inverters need to work as a team.
We have a system in operation since 2002 with a SW4048 and an SW5548 and 4200W of PV in a GTWB setup. Both have SWGTIs. The two inverters are not stacked, as they support different subpanels and load profiles and there are no 240V loads. The 4048 is set to sell, the 5548 only to float. The 4048 can charge and EQ from the grid at 30A AC, the 5548 is limited to 5A grid input. The 4048 is the workhorse, both buying and selling, and the 5548 primarily runs house loads. Works like a charm, and the two inverters don’t fight each other.
Allan Sindelar
Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.PositiveEnergySolar.com <http://www.positiveenergysolar.com/>
From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of toddcory at finestplanet.com
Sent: Tuesday, November 17, 2009 8:03 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] SW 4024 now grid tie
Here is an old 2001 posting from Bill Brooks...
William, Marco, and Jeff C.,
Here is the method I found to be most effective:
INVERTER SETUP (MENU 9)
set to SELL
BATTERY CHARGING (MENU 10)
set ABSORPTION TIME to 0:00 on both machines.
set MAX CHARGE AMPS to 1 amp on both machines.
BATTERY SELLING (MENU 17)
set MAX SELL AMPS to X amps on both machines. (where 2X is the Max AC amps
that the PV array can produce. (e.g. 4000 Watts should set both to 18
amps --18A*120V=2160Watts)
Both temp comp probes must be installed so as to operate at the same
temperature. I have tried adjusting the float setting and that also works
particularly for an inverter that is out of DC calibration. They still get
out of wack at times at different temperatures because the slope of the temp
comp probes are usually not the same. This should keep both machines selling
as evenly as they can and limit each machine to a maximum of half the AC
Watts output. The one amp MAX charge amps keeps one unit from charging while
the other one sells.
Try it and see how you like it.
Bill.
-----Original Message-----
From: William Miller [mailto:wrmiller at slonet.org]
Sent: Wednesday, September 26, 2001 6:19 PM
To: RE-wrenches at topica.com
Subject: RE: system output honesty [RE-wrenches]
Marco:
I must not have been very clear, but you don't necessarily end up with the
same numeric float voltage setting. Take the inverter with the lower
output and increase it's float voltage one increment at a time (I think it
adjusts in 0.2 volt increments) while checking sell amps. The change
should be immediate and obvious. (If it doesn't improve, try decreasing
float voltage because my memory may not be accurate.)
William
At 01:09 AM 9/26/01 -1000, you wrote:
>William,
>
>Maybe you have the magic touch with your dual SWs, but my dual SWs are set
>at the same float voltage and, as Bill B. noted, they don't "share" those
>incoming PV electrons very equitably.
>
>On another note, has anyone received an AEI MM5 or MM3 yet?
>
>marco
>ProVision Technologies
>Hilo, land of declining tourism Hawai'i
>
>Friends:
>With dual SW inverters (I believe, if memory serves me right) I finally
>discovered that adjusting the float voltage until they both sell more or
>less equally does the job of balancing.
>William
>
>
>
>
>
>
>At 05:04 PM 9/25/01 -0700, you wrote:
>>Jeff C.,
>>
>>It is less important with a small array, but it still will work slightly
>>better. The much bigger issue with dual inverters in sell mode is that
they
>
>>don't behave nicely with each other (they don't know how to share). One
>>inverter invariably wins the conversion battle and the other inverter sits
>>idle, or more likely, starts drawing power from the grid to fight the
other
>
>>inverter.
>>
>>I have yet to see a dual SW system on the grid the worked really well. You
>>can trick them into working with various settings. I have a set of
settings
>
>>that has worked well for me, others on the list may have their own
methods.
>
>>If people are interested, we can do this onlist. If not, email me and I'll
>>send them offlist.
>>
>>Bill.
>>
>>
__________________________________________________________________
William Miller
SLO Communications: Communications and Power Systems Consulting
PO Box 50, Santa Margarita, CA 93453
Voice :805-438-5600 Fax: 805-438-4607 VMail: 805-546-4875
email: wrmiller at slonet.org
License No. C-10-773985
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On Tuesday, November 17, 2009 2:18pm, "Dana" <dana at solarwork.com> said:
Hey all,
I have a client who was off grid and is now grid tied and has [2] Trace SW 4024 Inverters. I realize the parameters are not the best for high efficiency but the client is not into changing out to newer equipment.
Whom at which telephone @ Xantrex might be the best bet to talk to for programming advice for grid tie application for the SW 4024 inverters?
Dana Orzel
Great Solar Works, Inc
www.solarwork.com
E - dana at solarwork.com
V - 970.626.5253
F - 970.626.4140
C - 970.209.4076
I will be the shift in how the world uses power! - Dana Orzel
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