Re: [RE-wrenches] 300W 72 cell micro inverters

[Drake]

That  would be at the 120% rating, so by rule of 
thumb, OK. I have a ground mount that has a 
ration of 1.15% with M-190s (figuring 199 W / 
inverter). It has quite a bit of clipping in the 
spring. It has optimized tilt for the location. A 
ballasted roof mount with a 10 or 15 degree tilt 
likely wouldn't have that issue.


This system went in the spring of 2010, and has 
only  had one M-190 failure out of 24, amazingly enough.


At 10:22 AM 2/9/2015, you wrote:

What do you typically get out of a 300 watt panel for production when you
are grid tied? I know in theory (STC) it is a 300 watt module but we
rarely if ever (except in very cold weather)see near that for an output. I
use (as a general, 77 degrees F) design parameter, 77% for overall power
production output output. I'm sure you would get a little clipping, but I
guess a significant amount would depend on a number of variables on the
site, time of the year, weather conditions, etc.

Daryl


> Yeahif you're OK with a not insignificant amount of clipping going on.
>
> -Original Message-
> From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
> Behalf Of penobscotso...@midmaine.com
> Sent: Sunday, February 08, 2015 2:33 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] 300W 72 cell micro inverters
>
> Hey Jason,
>The M-250's work well with LG 300 watt (60 cell) modules.
>
> Daryl
>
>
>> Hi Jason,
>>
>> The Enphase C250 Microinverters for three-phase commercial
>> applications does work with 72 cell modules.
>>
>> On Sun, Feb 8, 2015 at 12:58 PM, Jason Szumlanski <
>> ja...@floridasolardesigngroup.com> wrote:
>>
>>> The ABB micros seem to be solid and easy to install. We have two
>>> sites with them with no issues. Unfortunately, the monitoring system
>>> sucks compared to Enphase and was far more difficult to set up. I
>>> really wish Enphase would come up with a good 72 cell option because
>>> we find ourselves competing with 300W modules occasionally, and
>>> consumers (irrationally) jump to the conclusion that bigger is
>>> better.
>>>
>>>
>>> [image: Logo-Sq-80.png]
>>>
>>> Jason Szumlanski
>>>
>>> Principal Solar Designer
>>>
>>> Florida Solar Design Group
>>>
>>> (239) 491-8010 office
>>>
>>> (239) 410-4985 mobile
>>>
>>> Authorized Sales Agent for Fafco Solar
>>>
>>> [image: Fafco-Solar-Enphase-Logo.png]
>>>
>>> License CVC56701
>>>
>>>
>>> On Sun, Feb 8, 2015 at 3:15 PM, Bill Hennessy 
>>> wrote:
>>>
 Hi folks--

 We're planning a micro inverter install using 300W 72 cell modules
 for an area with a fair amount of shading. The choices we've found
 are ABB micro
 0.3 or APS YC500A.
 Any stories to tell about either of these or another suggestion?

 Thanks for your time.

 Bill Hennessy
 Berks Solar, LLC
 371 Centennial Rd
 Mertztown, PA 19539

 o 610 682 4300
 c 484 560 4666
 NABCEP certified installer
 PA contractor #44411
 www.berkssolar.com








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>>>
>>> *Florida Solar Design Group is not an engineering or architectural
>>> firm and acts only as a consultant and authorized independent sales
>>> agent.
>>> Any
>>> advice or work product provided shall not be considered licensed
>>> professional services provided under Florida Statute Chapters 471,
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>>
>>
>> --
>>
>> Cordially,
>>
>> Nick Soleil
>> *Enphase Energy* | Field Applications Engineer
>>
>> office 707-763-4784 <%28707%29%20763.%204784> x7267 cell 07-321-2937
>>
>> 
>>
>> *Powering What’s Next*™* | *The Enphase Energy Management
>> System
>>  
>> 
>> 
>> 
>>
>>
>> NABCEP Certified Solar PV Installer #03262011-300
>>
>> California C10 Licensed Ele

Re: [RE-wrenches] tax credit carryover

[Kristopher Schmid]

I am interested in the answer to your question, Kirk.  If you find it
somewhere other than on this thread, can you please let me know.  I have
heard 5 years, but not from a CPA.

Thanks,
Kris

On Sat, Feb 7, 2015 at 2:43 PM, Kirk Herander  wrote:

> What is the length of carryover for the Federal tax credit (individual)?
> It’s clear in the tax code a business has a one year carry back & 20 year
> carry forward. For the residential, it seems to indicate only a 1 year
> carry forward, but not explicitly stated. Thoughts? Thanks.
>
>
>
> *Kirk Herander*
>
> *VT Solar, LLC *
>
> *Proven PV provider since 1991*
>
> *www.vermontsolarnow.com *
>
> dba Vermont Solar Engineering
>
> NABCEPTM Inaugural Certificant
>
> VT RE Incentive Program Partner
>
> 802.863.1202
>
>
>
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-- 
Shine On!

Kris Schmid
Legacy Solar, LLC
864 Clam Falls Trail
Frederic, WI 54837
www.legacysolar.com
715-653-4295
NABCEP Certified PV Installer
Licensed Wisconsin Master Electrician
BSEE
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Re: [RE-wrenches] NABCEP consultant fee

[Kristopher Schmid]

Chris,

I have done this in the past.  WI incentives used to require NABCEP cert.
Looking back, i probably undercharged.  Given that you are putting your
reputation and certification on the line and therefor will need to be
involved in design, planning, and inspection, i think that a percentage of
the installed cost would be a good way to approach it.  I see this service
as very similar to a construction manager who typically receives 5-7% of
project cost.

Just my .02

Kris

On Sat, Feb 7, 2015 at 9:28 AM, Chris Schaefer 
wrote:

> Good Day All,
>
> While I’m unsure how all states handle NABCEP, here in New
> York in order to obtain state incentives you or someone within your company
> must be a NABCEP PV professional. With the growth that our industry is
> experiencing there are more and more non-PV companies jumping into the
> scene. These companies are seeking out NABCEP individuals to add to their
> staffs without actually adding them to the payroll. My question to my
> NABCEP peers is what are you charging per project or how are you getting
> financially reimburse for your time/skills? Per watt, per project? If
> you’re uncomfortable making this public feel free to share your thoughts
> with me off list via my email or give me a call.
>
>
>
> Sincerely,
>
> Christopher Schaefer
>
>
>
> Chris Schaefer’s
>
> [image: SolarWindFX]
>
> *Tel/Fax 585-229-2083 <585-229-2083> or Cell
> 585-748-1870 <585-748-1870>  *
>
> * 5115 South Hill Road ~ Canandaigua New York 14424*
>
> *www.solarandwindfx.com  ~ E-mail:
> ch...@solarandwindfx.com *
>
>
>
>
>
>
>
>
>
>
>
>
>
> Thomas Jefferson, the author of our great Constitution, once said,
> "democracy" will cease to
> exist
> when you take away from those who are willing to work and give to those who
> would not."
>
>
>
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-- 
Shine On!

Kris Schmid
Legacy Solar, LLC
864 Clam Falls Trail
Frederic, WI 54837
www.legacysolar.com
715-653-4295
NABCEP Certified PV Installer
Licensed Wisconsin Master Electrician
BSEE
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Re: [RE-wrenches] 300W 72 cell micro inverters

[Jarmo . Venalainen]

Hi:

One thing to keep in mind with clipping, (module over sizing), is that if 
a system has 10%-15% off clipping, that will not affect total annual 
energy harvest and depending on dust and temperature conditions will 
likely even improve it.

Heres' a graph which shows the energy harvest graphically for a 250W 
module with a 250W inverter and a and 300W module with a 250W inverter.

 
Please note the graph does not include any dust effects.  To compensate 
for dust, the modules should always be of the order of 4% more powerful 
than the inverter, unless you plan on washing modules every month.

Related to this, large commercial systems we have been supplying inverters 
to are 30-70% oversized as the sinking cost of modules makes the return on 
investment come out as maximized in that range of oversizing,

JARMO 
_
 


Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalai...@schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 








*** Please consider the environment before printing this e-mail




From:
Drake 
To:
RE-wrenches , 
Date:
02/10/2015 06:51 AM
Subject:
Re: [RE-wrenches] 300W 72 cell micro inverters
Sent by:
"RE-wrenches" 



That  would be at the 120% rating, so by rule of 
thumb, OK. I have a ground mount that has a 
ration of 1.15% with M-190s (figuring 199 W / 
inverter). It has quite a bit of clipping in the 
spring. It has optimized tilt for the location. A 
ballasted roof mount with a 10 or 15 degree tilt 
likely wouldn't have that issue.

This system went in the spring of 2010, and has 
only  had one M-190 failure out of 24, amazingly enough.

At 10:22 AM 2/9/2015, you wrote:
>What do you typically get out of a 300 watt panel for production when you
>are grid tied? I know in theory (STC) it is a 300 watt module but we
>rarely if ever (except in very cold weather)see near that for an output. 
I
>use (as a general, 77 degrees F) design parameter, 77% for overall power
>production output output. I'm sure you would get a little clipping, but I
>guess a significant amount would depend on a number of variables on the
>site, time of the year, weather conditions, etc.
>
>Daryl
>
>
> > Yeahif you're OK with a not insignificant amount of clipping going 
on.
> >
> > -Original Message-
> > From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] 
On
> > Behalf Of penobscotso...@midmaine.com
> > Sent: Sunday, February 08, 2015 2:33 PM
> > To: RE-wrenches
> > Subject: Re: [RE-wrenches] 300W 72 cell micro inverters
> >
> > Hey Jason,
> >The M-250's work well with LG 300 watt (60 cell) modules.
> >
> > Daryl
> >
> >
> >> Hi Jason,
> >>
> >> The Enphase C250 Microinverters for three-phase commercial
> >> applications does work with 72 cell modules.
> >>
> >> On Sun, Feb 8, 2015 at 12:58 PM, Jason Szumlanski <
> >> ja...@floridasolardesigngroup.com> wrote:
> >>
> >>> The ABB micros seem to be solid and easy to install. We have two
> >>> sites with them with no issues. Unfortunately, the monitoring system
> >>> sucks compared to Enphase and was far more difficult to set up. I
> >>> really wish Enphase would come up with a good 72 cell option because
> >>> we find ourselves competing with 300W modules occasionally, and
> >>> consumers (irrationally) jump to the conclusion that bigger is
> >>> better.
> >>>
> >>>
> >>> [image: Logo-Sq-80.png]
> >>>
> >>> Jason Szumlanski
> >>>
> >>> Principal Solar Designer
> >>>
> >>> Florida Solar Design Group
> >>>
> >>> (239) 491-8010 office
> >>>
> >>> (239) 410-4985 mobile
> >>>
> >>> Authorized Sales Agent for Fafco Solar
> >>>
> >>> [image: Fafco-Solar-Enphase-Logo.png]
> >>>
> >>> License CVC56701
> >>>
> >>>
> >>> On Sun, Feb 8, 2015 at 3:15 PM, Bill Hennessy 
> >>> wrote:
> >>>
>  Hi folks--
> 
>  We're planning a micro inverter install using 300W 72 cell modules
>  for an area with a fair amount of shading. The choices we've found
>  are ABB micro
>  0.3 or APS YC500A.
>  Any stories to tell about either of these or another suggestion?
> 
>  Thanks for your time.
> 
>  Bill Hennessy
>  Berks Solar, LLC
>  371 Centennial Rd
>  Mertztown, PA 19539
> 
>  o 610 682 4300
>  c 484 560 4666
>  NABCEP certified installer
>  PA contractor #44411
>  www.berkssolar.com
> 
> 
> 
> 
> 
> 
> 
> 
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Re: [RE-wrenches] Off Grid Inverter Replacement Questions

[jay peltz]

It's amazing how different our experiences are with the same equipment!

I've installed hundreds of outbacks, and fixed my share to be sure. But they 
are the only one I know of that sends just boards and that you don't have to 
send the inverter back ( offgrid ). In the dozens of rebuilt outbacks, I've 
never had to re-fix one. 
Their ship time on board sets is pretty fast. 
The CC issue is long in the past, FYI


Out of the dozen magnums I've installed I've had one DOA, another fail in 2 
months, and a 3rd that had such bad rf noise I had to replace it with a VFX. 
My last failure took almost 3 weeks from removal to replacement while I waited 
to get it back. Yes fixed for free. 

Schneider no longer sends board sets. I just had a customer buy a new XW, vs 
try and repair it, given the unknown repair time or cost, truck cost both ways, 
my time etc. 

SMA, wish I could get my clients to afford them!  


So I'm with john. 

Jay
Peltz power. 



> On Feb 4, 2015, at 8:01 PM, John Blittersdorf  
> wrote:
> 
> Allan,
> I would replace with a VFX3524 and a Mate3 as long as the backup 
> generator is big enough.  FX's don't load share or gen support. I have had 
> lousy luck with getting several magnums repaired.  All have been switched to 
> Outback.  The Radian would be a nightmare to install compared to a single FX. 
>  I sell Radians primarily for grid tie backup systems and very high demand 
> off grid. And to replace Magnums.  I have had no trouble with Outback service 
> and getting boards for on site repairs. Quality of boards OK. The Mate 3 is 
> more intuitive than the Mate and has lots more information.  Works fabulously 
> with OpticsRE for monitoring.   I have a remote mountaintop transmitter site 
> that has been a nightmare for years and now we finally got all the pieces 
> together at one time to make it work.. Good generator (EcoGen) new batteries, 
> and 4000 watts of solar on top of pole racks (to self clear of snow) VFX3648 
> with IOTA 12v battery charger for the DC Loads, and the MATE3 hooked up to 
> the internet and OpticsRE.  All is now calm on the mountaintop.
> 
> John Blittersdorf
> Central Vermont Solar & wind
> 
>> On Fri, Jan 30, 2015 at 8:02 PM, Allan Sindelar  
>> wrote:
>> Esteemed Wrenches,
>> This question is prompted by a specific customer's situation, and I have a 
>> question related to this, but I'm mainly using the situation to ask a 
>> broader question.
>> 
>> The specific situation: A customer's Xantrex SW+2524 has been acting 
>> erratically. Fixing the inverter is not the issue; the client is quite 
>> remote, and costs of diagnosis, parts and labor for these legacy units have 
>> gone up enough that the customer has already decided to replace the unit 
>> with a current product. From my perspective, the issues at hand revolve 
>> around how to safely and cleanly install a modern inverter into a system 
>> structured around old equipment. 
>> 
>> The specific question: Outback's FX series is the current product that most 
>> readily replaces the SW/SW+ series: it's also 120V in/out, and it has DC on 
>> the right and AC in/out on the left of a horizontally-laid out unit. 
>> However, several times in recent years I have heard disparaging comments, 
>> both here and in private conversations, about the purported drop in quality 
>> of Outback's inverters and controllers since Alpha bought them, but 
>> specifically because units, or parts of units, are now made in China, rather 
>> than in the U.S. What I want to know, please, are answers to two+ questions: 
>> 1) what's the real scoop? what is now made where? and 2) what actual 
>> experiences, specifically product failures, have any of you had that 
>> directly relate to changes directly attributable to overseas production? In 
>> other words, how much of this is real and how much is rumor?
>> 
>> The bigger question (and this issue will come up frequently in the coming 
>> years): the SW+, like the SW before it, operates at 120V AC on both input 
>> and output. More and more modern battery-based inverters input and output 
>> split-phase 120/240V AC. When should I hesitate to replace a 120V legacy 
>> inverter with a 120/240V unit?
>> 
>> Among larger whole-house single inverters, Outback's FX and VFX units 
>> operate at 120V, but these are older models. SMA's Sunny Island is 120V 
>> only, but this is generally considered a weakness in typical SI 
>> installations, and these expensive units don't adapt as well as replacements 
>> in older home systems. Magnum's MS4024 is available in either configuration. 
>> Outback's Radian and Schneider's XW and Conext SW are only available as 
>> 120-240 units.
>> 
>> Here are the issues that I see: 
>> Don't do it if a backup generator is 120V AC-only. It will work, but is hard 
>> on the inverters, as all charging current will come in on one leg of the 
>> inverter's AC input. Fortunately, relatively few generators are 120V-only; 
>> pretty much just the smaller invert

[RE-wrenches] Off Grid Inverter Replacement Questions

[Dana]

I have to share Jays experience here. I have lost track of how many OB 
inverters and charge controllers I have installed since OB hit the scene. 

I have never had a dead unit out of a box and have only had to swap out 4 sets 
of circuit broads over the years(mostly due to lightning related). I have never 
had a bad board initially and not had a replacement die.

 

I can say that the wait on the tech line has lengthened severely over time and 
leaving a message for a call back is a joke (3 days till a response on the last 
message I left).

 

I have to applaud the OB collection of equipment for compatibility OB to OB and 
communication has been great. The old Trace SW series used to have “HAL2001” on 
the front panel as a reference to 2001 Space Odyssey movie because it ran the 
ship. I would have to say that today’s OB equipment has taken that a step 
further. I live in OB GTVFX grid tied with battery backup for the last 10 years 
and it has been flawless.

 

I caution the new owners of OB to not get complacent (Xanterex is a prime 
example) and keep the quality that they were famous for and improve the tech 
support access. When I am on a site 2 hours from the shop, barely have cell 
service, & need tech support, I need it then not in 3 days & the email response 
time is typically the same as leaving a message.

 

I will continue for now to install OB.

 



Dana Orzel 

Great Solar Works, Inc -  NABCEP # 051112-136

E - d...@solarwork.com  - Web - solarwork.com 

O - 970.626.5253  C - 208.721.7003 - No FAX Line

"Responsible Technologies for Responsible People since 1988"  

P Please consider the environment before printing this email.

 

 

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of jay peltz
Sent: Tuesday, February 10, 2015 12:09 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Off Grid Inverter Replacement Questions

 

It's amazing how different our experiences are with the same equipment!

 

I've installed hundreds of outbacks, and fixed my share to be sure. But they 
are the only one I know of that sends just boards and that you don't have to 
send the inverter back ( offgrid ). In the dozens of rebuilt outbacks, I've 
never had to re-fix one. 

Their ship time on board sets is pretty fast. 

The CC issue is long in the past, FYI

 

 

Out of the dozen magnums I've installed I've had one DOA, another fail in 2 
months, and a 3rd that had such bad rf noise I had to replace it with a VFX. 

My last failure took almost 3 weeks from removal to replacement while I waited 
to get it back. Yes fixed for free. 

 

Schneider no longer sends board sets. I just had a customer buy a new XW, vs 
try and repair it, given the unknown repair time or cost, truck cost both ways, 
my time etc. 

 

SMA, wish I could get my clients to afford them!  

 

 

So I'm with john. 

 

Jay

Peltz power. 

 

 

 

On Feb 4, 2015, at 8:01 PM, John Blittersdorf  
wrote:

Allan,

I would replace with a VFX3524 and a Mate3 as long as the backup generator 
is big enough.  FX's don't load share or gen support. I have had lousy luck 
with getting several magnums repaired.  All have been switched to Outback.  The 
Radian would be a nightmare to install compared to a single FX.  I sell Radians 
primarily for grid tie backup systems and very high demand off grid. And to 
replace Magnums.  I have had no trouble with Outback service and getting boards 
for on site repairs. Quality of boards OK. The Mate 3 is more intuitive than 
the Mate and has lots more information.  Works fabulously with OpticsRE for 
monitoring.   I have a remote mountaintop transmitter site that has been a 
nightmare for years and now we finally got all the pieces together at one time 
to make it work.. Good generator (EcoGen) new batteries, and 4000 watts of 
solar on top of pole racks (to self clear of snow) VFX3648 with IOTA 12v 
battery charger for the DC Loads, and the MATE3 hooked up to the internet and 
OpticsRE.  All is now calm on the mountaintop.

 

John Blittersdorf

Central Vermont Solar & wind

 

On Fri, Jan 30, 2015 at 8:02 PM, Allan Sindelar  wrote:

Esteemed Wrenches,
This question is prompted by a specific customer's situation, and I have a 
question related to this, but I'm mainly using the situation to ask a broader 
question.

The specific situation: A customer's Xantrex SW+2524 has been acting 
erratically. Fixing the inverter is not the issue; the client is quite remote, 
and costs of diagnosis, parts and labor for these legacy units have gone up 
enough that the customer has already decided to replace the unit with a current 
product. From my perspective, the issues at hand revolve around how to safely 
and cleanly install a modern inverter into a system structured around old 
equipment. 

The specific question: Outback's FX series is the current product that most 
readily replaces the SW/SW+ series: it's also 120V 

Re: [RE-wrenches] tax credit carryover

[Carl Adams]

My CPA said that for residential customers, the credit could be carried
forward until the year the credit expires (2016)

Carl Adams
NABCEP Ceritifed Solar Installer
Sunrock Solar

On Tue, Feb 10, 2015 at 12:54 PM, Kristopher Schmid 
wrote:

> I am interested in the answer to your question, Kirk.  If you find it
> somewhere other than on this thread, can you please let me know.  I have
> heard 5 years, but not from a CPA.
>
> Thanks,
> Kris
>
> On Sat, Feb 7, 2015 at 2:43 PM, Kirk Herander  wrote:
>
>> What is the length of carryover for the Federal tax credit (individual)?
>> It’s clear in the tax code a business has a one year carry back & 20 year
>> carry forward. For the residential, it seems to indicate only a 1 year
>> carry forward, but not explicitly stated. Thoughts? Thanks.
>>
>>
>>
>> *Kirk Herander*
>>
>> *VT Solar, LLC *
>>
>> *Proven PV provider since 1991*
>>
>> *www.vermontsolarnow.com *
>>
>> dba Vermont Solar Engineering
>>
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Re: [RE-wrenches] 300W 72 cell micro inverters

[Dave Click]

Regarding the clipping, which the power electronics guys would rather I 
call "power limiting"...


To be clear, "Longer 100% production around noon" (implied in that image 
that this is somehow beneficial) means "this system could have produced 
more energy but didn't because the inverter was too small." Assuming 
similar efficiencies, a 300W micro-inverter clearly would have produced 
more energy on that day than the 250W inverter. I imagine that what you 
mean was that if you're locked into a certain ac limit here (either you 
can only use a 250W micro, or maybe your service conductors limit your 
ac rating) then yes, a higher dc/ac ratio may have more power limiting 
but will produce more energy at the expense of your kWh / kWdc yield (a 
consideration for some projects).


Given that the ABB inverters have their highest efficiencies at the 
higher end of their power outputs, which is not where PV modules 
typically operate (unless you stick a 400W module on it), I'm curious 
whether a typical 280W module would actually produce more energy over a 
year with an Enphase 240W vs the ABB 300W in most locations. Over the 
full Enphase power range it's more efficient than the ABB:


At ~100W dc input, Enphase is at about 96.4% efficient and the ABB 300W 
is at 95.8%.

At ~250W input: Enphase 96.4%, ABB 96.1%.
And yes, at 315W input: Enphase 76.2% steady-state, ABB 96.4%.

It could go without saying (but I have momentum) that you should not 
spend $2000 on a larger inverter(s) that will help your array produce 
$200 more energy over its 25-year life. It's up to you to figure that 
out given your site conditions and as noted in the last thread that 
addressed this topic, weather data probably underestimates the benefit 
due to its averaging out most short-term edge-of-cloud effects.


Anyway, maybe C250s would meet the OP's needs and they're actually the 
slightest bit more efficient than the standard 240W unit. That is, until 
you add the transformer since the output is 220-248V L-N. That 
presumably makes the ABB the efficiency winner, but hopefully the above 
is still useful. Sorry, no personal experience with any of the 
ABB/APS/C250 units. I probably should have opened with that to save you 
some time.


DKC

On 2015/2/10 13:05, jarmo.venalai...@schneider-electric.com wrote:

Hi:

One thing to keep in mind with clipping, (module over sizing), is that 
if a system has 10%-15% off clipping, that will not affect total 
annual energy harvest and depending on dust and temperature conditions 
will likely even improve it.


Heres' a graph which shows the energy harvest graphically for a 250W 
module with a 250W inverter and a and 300W module with a 250W inverter.



Please note the graph does not include any dust effects.  To 
compensate for dust, the modules should always be of the order of 4% 
more powerful than the inverter, unless you plan on washing modules 
every month.


Related to this, large commercial systems we have been supplying 
inverters to are 30-70% oversized as the sinking cost of modules makes 
the return on investment come out as maximized in that range of 
oversizing,


JARMO
_
*
Jarmo Venalainen*  | *Schneider Electric **|  Xantrex Brand*  | 
*CANADA*  | *Sales Application Engineer* *
Phone:* +604-422-2528  | *Tech Support:* 800-670-0707  | *Mobile:* 
+604-505-0291 *
Email:* _jarmo.venalainen@schneider-electric.com_ 
 | 
*Site:*_www.Xantrex.com_  | *Address:* 3700 
Gilmore Way, Burnaby, BC V5G4M1










*** Please consider the environment before printing this e-mail



From:   Drake 
To: RE-wrenches ,
Date:   02/10/2015 06:51 AM
Subject:Re: [RE-wrenches] 300W 72 cell micro inverters
Sent by:"RE-wrenches" 






That  would be at the 120% rating, so by rule of
thumb, OK. I have a ground mount that has a
ration of 1.15% with M-190s (figuring 199 W /
inverter). It has quite a bit of clipping in the
spring. It has optimized tilt for the location. A
ballasted roof mount with a 10 or 15 degree tilt
likely wouldn't have that issue.

This system went in the spring of 2010, and has
only  had one M-190 failure out of 24, amazingly enough.

At 10:22 AM 2/9/2015, you wrote:
>What do you typically get out of a 300 watt panel for production when you
>are grid tied? I know in theory (STC) it is a 300 watt module but we
>rarely if ever (except in very cold weather)see near that for an 
output. I

>use (as a general, 77 degrees F) design parameter, 77% for overall power
>production output output. I'm sure you would get a little clipping, but I
>guess a significant amount would depend on a number of variables on the
>site, time of the year, weather conditions, etc.
>
>Daryl
>
>
> > Yeahif you're OK with a not insignificant amount of