Omega Engineering.
http://www.omega.com/pptst/5TC.html
You must be careful about the thermal conductivity of the attachment
method. These pads, part number is TAP, are made of Kapton, and
provide some level of thermal insulation. I have some on my array that
are still in place after two yea
All utility interactive inverters must be connected to a DEDICATED branch
circuit. NO LOADS on the inverter side of the OCPD.
Not to mention that it is the UL1741 listing process that verifies personnel,
property, and utility protection from injury, shock, and fire. This kind of
stuff from Ch
David,
Do you have a diode in series to prevent nighttime discharge of the battery
thru the module? I have done this for a 100A/H battery with a 16W thinfilm
module. I used a series diode, but maybe this is not necessary?
See ya!
Marv
Director of Technology and Support, North America
SolarE
Come on, Bob.
It’s a ground fault in the array. Just one more example why ungrounded arrays
are FAR safer.
See ya!
Marv
Director of Technology and Support, North America
SolarEdge Technologies, Inc.
Tech Support Mobile: +530.798.6770
Mobile: +530.392.0356
From: re-wrenches-boun...@lists.re-
Drake,
This is a HUGE problem. If you want a real earful, talk to John Wiles, Bill
Brooks, or Greg Ball about this.
While you might think that the anodizing on the aluminum would prevent
electrical contact to the copper, it doesn't last long with just a little
vibration (usually due to wind).
Wrenches,
I feel compelled to reply here, as I have personally performed all of these
tests and listed several dozen inverters over the last 10 years.
The "Utility-Interactive" marking on listed inverters means that they meet all
of the Utility Protective Function requirements as outlined in IE
al Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marv Dargatz
Sent: Wednesday, July 20, 2011 11:11 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Anti-Islanding Explanantion
Wrenches,
I feel compelled to reply here, as I have
All,
Please note that I left Enphase about one year ago, and joined John Berdner at
SolarEdge.
To answer the question, virtually all inverters will deliver more power than
their rating. The Max power test for listing on the CEC list of eligible
inverters requires a full power run at elevated
This all works fine, until you fire up a generator to charge batteries. If the
generator remains within voltage and frequency limits, you stand a good chance
of overvoltaging the batteries. In this situation it is best to disable the
utility-interactive PV system while charging batteries from
As long as an appropriately sized and rated OCPD is used on the input and/or
output circuit of both devices, it shouldn't be a problem.
If it is a problem, it is with the testing certification process, and the
standard needs to be fixed, or the testing laboratory needs to re-evaluate
their inte
I agree 100% with Jay, except . . . I prefer diesel.
You can store it safely (for several years), the energy density is high.
And, you don't have to rely on delivery systems.
See ya!
Marv
Director of Technology and Support, North America
SolarEdge Technologies, Inc.
Tech Support North America:
Hey Mick,
We used a lot of SSRs in wind turbine controls. Found them to be
extremely reliable. Overrating the device is a very good idea. Also
be careful of very low temperatures, as the Current Transfer Ratio
(CTR) of the optical isolation can degrade over time and eventually
cause failure
I wonder how long until one of these starts a fire
in a non-dedicated branch circuit in a home.
Think about it. There's a VERY GOOD REASON for requiring utility
interactive inverters to be tied to a dedicated branch circuit.
See Ya!
Marv
Enphase Energy
707 763-4784 x7016
Matt Lafferty w
Keith,
The whole grounding issue has been very contentious, confounding, and
confusing. The introduction of the changes with the 2008 NEC seems to
have complicated things further.
Also, just a general comment; in general (there will be exceptions for
larger systems, depending on electrical c
Wrenches,
There is NO RECALL of any Enphase products. There has NEVER been a
recall of any Enphase product.
Demand has far exceeded our expectations. This has led to challenges
with product availability which may have resulted in misinformation in
the field.
Ramping up production is our nu
Wrenches,
Yes, we have an agreement with Akeena to
supply
units for their Andalay product, but the speculation that we are
diverting our deliveries from general
distribution is absolutely not true. Please consider these facts:
The vast majority of our product is shipped
into general
distribut
Be careful with the silicon. Most of it is
hygroscopic, and contains acetic acid.
Automobile windshields are often secured with Butyl rubber caulk. It
is impervious to moisture. Might this be a good choice? I also wonder
if a polyurethane (like sikaflex) would be appropriate.
See Ya!
Mar
Title: Efficiency Curves of Fronius
Inverters?
Jeff,
Try this.
http://www.gosolarcalifornia.org/equipment/inverter_tests/summaries/
Hope this helps.
See Ya!
Marv
Enphase Energy
707 763-4784 x7016
Jeff Clearwater, Village Power Design wrote:
Hey Folks,
Anyone have or kn
There are many points here that really need to be
made. I could write for days on this subject, but I'll just make a few
points in anticipation that it will generate some open and accurate
discussion. Here's my 10 cents, in no particular order:
Right off the bat, don't get me wrong. Utiliti
Check out the following link. Just ONE example of
what the utility must deal with.
http://tdworld.com/customer_service/power_new_technology_solves/
I'm not defending the utilities. They definitely have their faults
(argh, argh), but they have some severe challenges that we are not
always se
IEEE1547 totally changed the way the utility
protective functions are specified.
For line voltage, the old UL1741 and IEEE1547 have the same table but
the requirement is different.
Here is the table:
Under 1741, the inverter had to trip off at less than the stated
voltage (for the high t
SMA absolutely operates solely on Batt SOC. In
fact, the Germans pride themselves on their "superior" SOC management,
and have convinced some battery manufacturers to extend the battery
warranty based on this "superior" SOC management.
See Ya!
Marv
Enphase Energy
707 763-4784 x7016
Darryl
Title: Re: [RE-wrenches] Square D DC disconnects
The testing for the HU series switches was
performed by Square D according to a procedure that I wrote when
working with SMA. The procedure was reviewed and accepted by UL as
valid for the dedicated purpose of PV disconnect when used with the SM
Title: Re: [RE-wrenches] Square D DC disconnects
Not sure why the following reply which I posted a
couple of hours ago never got posted on the list. I can offer more
detail as to the considerations the test process must be given for this
application if anybody is interested.
Begin previous me
And Sunpower. But, they're not on the list
http://www.enphaseenergy.com/downloads/Enphase_Module_Compatibility_List.pdf
because Sunpower has not officially endorsed their use with Enphase.
We should probably take any further discussion off list.
See ya!
Marv
707 763-4784 x7016
Marco Man
Marco,
You are right on with your observation. It is extremely frustrating
when "industry experts" in a technical industry use the wrong technical
terms.
rant ON
Another example; the improper use of "panel" when the intended meaning
is "module". Check 690.2 for the definitions. Just wait
Ungrounded (transformerless) systems require PV
wire, not USE2. PV wire is listed under the ZKLA category at UL. Go
to the UL certifications page (
http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.html )
and enter ZKLA in the "UL Category Code" box for a list of approved
manufa
One key requirement for the installation of
grid-tied PV is that it be connected to a dedicated circuit. This is
mandatory to prevent circuit conductor overloading under certain fault
conditions. A DIYer may be inclined to connect his PV into an existing
circuit. We even get inquiries about
Esteemed wrenches,
Any assistance here would be greatly appreciated.
Does anybody know of a comprehensive list that tells what modules have
PV wire and which ones have only USE2? The thought of contacting every
PV module manufacturer and extracting this information from them is
very daunting
Marco,
If you don't have success with the list, contact me directly and I'll
be glad to help.
See ya!
Marv
707 763-4784 x7016
Marco Mangelsdorf wrote:
As in Enphase 190s, S11 version, with the MC3
connectors.
As in about 100 of ‘em.
Anyone have any suggested
The CEC max power tests require continuous output
power monitoring for 180 minutes. At the end of the test, the CEC
published power rating of the inverter is the manufacturer's stated max
power OR the lowest power measured during the CEC test, whichever is
lower. So, most manufacturers set th
This should not be troubling at all. It is very
straight forward.
Because there is only one module per inverter, and the conductors are
sized for all possible overcurrent conditions, no further consideration
is necessary for the DC side of the circuit.
For the ac side, section 690.8(A)(3) ap
Dana, Marco, Wrenches,
In most locations, if the interest is in maximum lifetime energy
production, it does make sense to use modules with STC power ratings
significantly higher than the inverter max power rating.
This is explained in the whitepaper located at:
http://www.enphaseenergy.com/
Marco,
Sorry, I missed that question in the previous e-mail.
A couple of points about the compatibility list:
1. We include only modules that have passed our internal math check
for compatibility over the temperature range of the inverter.
2. If the module manufacturer objects to being on
Randy
Randy
Sadewic
Positive
Energy
Office:
505 424-1112
Cell:
505 570-0137
From:
re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marv
Dargatz
Sent: Monday, May 10, 2010 3:59 PM
To: RE-wrenches
S
Try Amphenol.
See ya!
Marv
707 763-4784 x7016
William Miller wrote:
Marco
Yes, Weiland is a knock-off. I have a sample packet I got at some
trade show, they seem to match well. They may or may not have
listing.
Here are e-mail addresses I have for MC:
s.schlesin...@multi-contact
Wrenches,
Please note that Enphase has completed testing and received listing for
the ac connectors and the DC connectors for use as the disconnect as
required by the NEC. No other disconnect device is required. This
information is contained in the latest Installation and Operations
manual,
Bill,
I agree with everything you're saying, if you substitute "cell
temperature" for "ambient temperature".
See ya!
Marv
707 763-4784 x7016
Bill Brooks wrote:
Peter,
Not to belabor the issue, but your understanding of the I-V curve and how it
responds to changes in irradiance and t
ker in the load
center has been opened."
Sorry, but that's just not a clear a set of instructions yet. Can we
open these connectors under load or are we never supposed to open them
under load?
Kent Osterberg
Blue Mountain Solar
Marv Dargatz wrote:
Wrenches,
Ple
ule still says don't open under load. Fortunately
that isn't a serious problem because the dc current should be zero if
the ac power is disconnected. But that is ignoring the possibility of
a dc short circuit in the inverter.
Kent Osterberg
Blue Mountain Solar
Marv Dargat
he ambient temperatures are
likely to be
different. Just a brain teaser—it was fun teasing your brain.
Bill.
From:
re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marv
Dargatz
Sent: Friday, May 21, 2010 7:26 AM
To: RE-wrenches
All,
We've used a number of the Dent Instruments dataloggers.
http://www.dentinstruments.com/
Good performance, great support. A little pricey, and the interface is
a bit clunky, but an overall good value.
DEFINITELY a huge step above the TED.
See ya!
Marv
707 763-4784 x7016
Darryl
Title: Re: [RE-wrenches] AC wiring loss on micro-inverters
Nick,
Sorry for the delayed reply. I've been traveling and am just catching
up on e-mails.
Your method is absolutely correct. We're working on an appnote and a
calculator to provide you guys with some quick tools.
David also brings
Nick,
We do not offer a T cable, but that's a great idea. I'll shop it
around and see what comes out of it. By the way, the Soladeck seems to
be a great product. For residential rooftops it also allows you to go
directly through a roof penetration and transition to Romex
immediately. Makes
Dan,
Thank you SO much for that post. You are absolutely right on.
EVERY component in a circuit can be the weak link. Component quality, design
margin, and actual use conditions really dictate what is going to fail, and
when.
See ya!
Marv
Director of Technology and Support, North America
S
All,
We had a component quality problem with some early production batches.
Unfortunately you guys in the field had to go thru a fair amount of grief
before we wrapped our heads around what was going on, identified the root
cause, and fixed the problem. We absolutely stand behind the product
Has anybody on this list ever used Thermoil? http://thermoil.com/
My dad has a Jeep that sits for months at a time while they travel in the
winter. He used Thermoil in the battery when it was new, and it's still going
strong after more than ten years. He also put it in the house batteries in
Allan,
You might consider low ESR/ESL capacitors in parallel with the batteries to
provide motor start surge. Much cheaper and require no maintenance.
See ya!
Marv
Director of Technology and Support, North America
SolarEdge Technologies, Inc.
Tech Support North America: +877.360.5292
Mobile:
There's just no substitute for an oscilloscope.
See ya!
Marv
Director of Technology and Support, North America
SolarEdge Technologies, Inc.
Tech Support North America: +877.360.5292
Mobile: +530.392.0356
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wren
Dan,
You had me rolling on the floor, clutching my (now sore) stomach, and not able
to see due to the flood of tears in my eyes.
Perhaps you should buy smaller underwear that isn’t capable of reaching above
your belly button.
See ya!
Marv
Director of Technology and Support, North America
Sol
What is "peak volts" and "peak amps"?
The only ratings that should apply here are Vmp and Imp. Plus, of course,
deratings for temperature and correction for irradiance and angle of incidence.
See ya!
Marv
Director of Technology and Support, North America
SolarEdge Technologies, Inc.
Tech Supp
obile: +530.392.0356
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Wallace Stahle
Sent: Tuesday, July 03, 2012 3:36 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Kyocera KC 120-1R = 102 Watt
On Jun 28, 2012, at 11:11 AM, Marv Dargatz
I had a similar situation with my own PV system many years ago. The utility
person demanded a disconnect within 10 feet of the meter. When I pulled out a
copy of the rule 21 interconnect agreement (I'm in California), and pointed out
that there was no such requirement, they got on the phone fo
Mark,
From an inverter manufacturer's standpoint there is a huge advantage in
running positive ground in all installations. Since the ground is
provided through the GFDI circuit of the inverter, only one
configuration of inverter must be stocked, and there is no need to
provide field configu
n.
See Ya!
Marv
Enphase Energy
707 763-4784 x7016
jay peltz wrote:
Hi Marv,
What do they do in Europe or japan?
How are they grounded, or are they grounded?
thanks,
jay
On Sep 21, 2008, at 11:17 AM, Marv Dargatz wrote:
Mark,
From an inverter manufacturer's standpoint there is a huge advant
Peter,
The qualification testing for UL1741/IEEE1547 listing of the inverters
covers anti-islanding in excruciating detail. In addition, every
inverter must be tested on the production line to ensure compliance with
the Utility Interactive requirements. The fact that an inverter has the
"Ut
It is ETL listed.
Still shown on the website:
http://www.intertek-etlsemko.com/portal/page/cust_portal/ITK_PGR/PRODUCT_DIRECTORIES_PG/ETL_LISTED_PG
Click on "ETL Listed Directory" on the left and search for "SMA".
It is the 6th of 6 listings.
I'm actually a bit surprised that it's still liste
Wrenches,
The Enphase system meets all regulatory requirements for a utility
interactive PV system. Also, we were very careful and thorough in
making sure that it meets all NEC requirements. If you run into an AHJ
who has objections, please put them in contact with our Customer Support
peop
Third Sun Solar & Wind Power Ltd.
340 West State Street, Unit 25
Athens, OH 45701
740.597.3111 Fax 740.597.1548
www.Third-Sun.com
Clean Energy - Expertly Installed
- "Marv Dargatz" <[EMAIL PROTECTED]> wrote:
Wrenches,
The Enphase system meets all re
Mark,
Some of your conjecture has been addressed by other wrenches in
subsequent posts. I do not think that this is the right forum for
further discussion of this kind. I believe this forum is intended for
technical and regulatory discussions. Is there a forum for
marketing/sales/strategy
Greg,
The 200W, 96 cell inverter is CSA listed to UL1741, and is on the CEC
list of eligible inverters. Obviously there are more products on the
way, but I'm not at liberty to discuss the details right now. We do
keep the website VERY up to date.
Your results are very much inline with our
Hey, I've renamed the subject to "Xantrex XW".
See Ya!
Marv
Enphase Energy
707 763-4784 x7016
Tump wrote:
Sounds like the old trace GTI boxes...UP DOWN UP DOWN
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of R.Scott
Carlson
Sent: Monday, October 2
Kurt,
The NEC provides for, and the AHJs have accepted the use of the
connectors as a form of disconnect. Of course, each branch is also
connected to a dedicated branch overcurrent device (circuit breaker).
On the DC side, since only one module is connected to each inverter, the
connectors
wrote:
--On Monday, December 29, 2008 8:29 AM -0800 Marv Dargatz
wrote:
The NEC provides for, and the AHJs have accepted the use of the
connectors as a form of disconnect. Of course, each branch is also
connected to a dedicated branch overcurrent device (circuit breaker).
On the DC side,
I'd suggest a differential voltage probe and a current probe with a two
channel scope. Observe both waveforms simultaneously. Phase shift
(PF), amplitude, waveshape, harmonics, etc all at one time. Most
digital scopes you can store the waveforms, download them to your
computer, or just take
All,
Mean Time Between Failure (MTBF) is a statistical number that is based
on failure rates of components in a piece of equipment, under specific
operating conditions. Numerical analysis, with testing and historical
data, results in this calculated number. MTBF can be applied to a
number of
Wrenches,
There has been substantial interest and discussion about MTBF. As
promised last week, here is the link.
http://www.enphaseenergy.com/support/downloads.cfm
It is near the bottom of the page and is titled "Reliability of Enphase
Micro-Inverters".
Comments and questions are welcome
Travis,
You are exactly right. As long as you do not exceed the max open
circuit voltage or short circuit current rating you're perfectly fine.
Even if you put 300W of module on the inverter, it will just hit power
limit until the irradiance declines enough to let the MPPT work again.
No pro
ill continue to charge the same battery bank.
Best,
Travis Creswell
Ozark Energy Services
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marv Dargatz
Sent: Tuesday, April 07, 2009 7:32 PM
To: RE-wrenches
S
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