On 10/2/2011 11:53 AM, d...@foxfire-energy.com wrote:
If it were me (Depending on how big the back up loads are), I'd make
the array direct grid tie, and then set up a smaller stand alone
system (At the house) for critical loadsback up.. more like a big
UPS.. (no DC in)
db
Dan Brown
Foxfire E
On 9/3/2011 7:57 PM, Darryl Thayer wrote:
I have had one experiance with equalizers, the batteries be came very
unequal. (over time of course)
*From:* R Ray Walters
*To:* RE-wrenches
*Sent:* Saturday, September 3, 2011 5:55 PM
*Subject:* Re: [RE-wrenches] unique battery bank design question
I am sad to report that /Louis Valenta of interisland Solar in Hawaii
has passed away in the last few days.
Louis had a heart attack about a week ago and this is probably related
to that.
//He was a very good person, friend and also extremely knowledgeable in
our industry.
//
We will re
On 8/18/2011 11:10 AM, Marco Mangelsdorf wrote:
Evergreen Solar, one of the last remaining independent U.S. module
manufacturers, announced their plan to file for bankruptcy protection
this week.
Done in by plummeting module pricing no doubt.
I'm sure you all are getting the same kind of so
On 8/15/2011 6:34 PM, Darryl Thayer wrote:
Hi wrenches, I have been informed off list that my system is not a
supported configuration, that one phase can be paralelled, but the
other two can not, one only on each of the other legs. So unless
Outback comes back with more info, I was wrong. (mi
Behalf Of *boB
Gudgel
*Sent:* Thursday, July 28, 2011 10:56 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] 2 SW inverters on three phase
Do you just want to charge batteries and are these regular 120VAC
SWs ?? 120/208 ??
If so, you should just be able to connect each SW from neutr
On 7/28/2011 12:32 PM, William Miller wrote:
Friends:
First of all, the inverters are PS series, not SW.
Second, I have created a solution: I can acquire a transformer that
will connect a primary across two of the 208 generator phases and
create 120/240 off of the secondary. This will imbal
Do you just want to charge batteries and are these regular 120VAC SWs
?? 120/208 ??
If so, you should just be able to connect each SW from neutral to hot.
No stacking necessary.
A regular SW stacking cable won't work for delta connections because
that assumes
the phases are going to
On 7/26/2011 4:42 PM, Joel Davidson wrote:
Power factor less than 1.0 can shorten the life of and damage
equipment and reduce PV production. We installed a 200 kW PV system on
a facility with a lot of 3-phase motors and monitored the PV and the
grid. We measured around 0.7 PF being delivered by
This is an interesting observation regarding this that we heard about.
boB
We have a friend from Washington State that also took the UL class. The
instructor was not a UL employee, but rather a professional installer
from Florida. His class was ok, but nothing in depth for anyone that
al
On 7/19/2011 2:34 PM, David Brearley wrote:
Presumably the latter---added as part of the cycle of revisions
initiated in 1987.
The array shorting requirement must have gone away near 1993 or 1994 as
I designed an opening and shorting of the array style GFPD version in
1994 while at Trace Engi
On 7/14/2011 1:43 PM, Allan Sindelar wrote:
Wrenches,
I'm stumped as to the best approach for a customer who wants a
non-grid-tied, batteryless PV-powered EV charging station. See below,
from one of our salespeople. Any ideas?
Thank you,
Allan
So, does this car in the car charging station
On 7/1/2011 10:04 AM, Bill Brooks wrote:
Nick,
If your voltage is low and there is no ground fault, either positive
and negative are connected mid string, bringing the voltage down, or a
bunch of modules never got connected in series. In either case, the
Voc difference between the two string
On 7/1/2011 12:12 AM, boB Gudgel wrote:
On 7/1/2011 12:07 AM, boB Gudgel wrote:
On 6/30/2011 11:35 PM, boB Gudgel wrote:
On 6/30/2011 8:35 PM, Nick Vida wrote:
Hi wrenches.
I had an interesting case today that I have been thinking about
since it happened. I dont have all the details b
On 7/1/2011 12:07 AM, boB Gudgel wrote:
On 6/30/2011 11:35 PM, boB Gudgel wrote:
On 6/30/2011 8:35 PM, Nick Vida wrote:
Hi wrenches.
I had an interesting case today that I have been thinking about
since it happened. I dont have all the details because the
homeownter had to leave before I
On 6/30/2011 11:35 PM, boB Gudgel wrote:
On 6/30/2011 8:35 PM, Nick Vida wrote:
Hi wrenches.
I had an interesting case today that I have been thinking about since
it happened. I dont have all the details because the homeownter had
to leave before I was done with the service call, but here is
On 6/30/2011 8:35 PM, Nick Vida wrote:
Hi wrenches.
I had an interesting case today that I have been thinking about since
it happened. I dont have all the details because the homeownter had to
leave before I was done with the service call, but here is what I do
know. SB5000 with 2 strings of
0.798.6770
>
> Mobile: +530.392.0356
>
> *From:*re-wrenches-boun...@lists.re-wrenches.org
> [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *boB
> Gudgel
> *Sent:* Thursday, June 30, 2011 10:19 PM
> *To:* RE-wrenches
> *Cc:* Nick Vida
> *Subject:* Re: [RE-
On 6/30/2011 8:35 PM, Nick Vida wrote:
Hi wrenches.
I had an interesting case today that I have been thinking about since
it happened. I dont have all the details because the homeownter had to
leave before I was done with the service call, but here is what I do
know. SB5000 with 2 strings of
ubject: Re: [RE-wrenches] 24 volt Battery Bank comparison
From: boB Gudgel mailto:b...@midnitesolar.com>>
Date: Thu, June 02, 2011 8:56 pm
To: RE-wrenches mailto:re-wrenches@lists.re-wrenches.org>>
Nobody mentioned this in this thread, but it occurs to me that the
x
I have one and used it for finding uninsulated spaces, but cannot
attest to its durability or suitability for the other uses
mentioned above.
boB Gudgel wrote at 01:00 AM 6/1/2011:
>This might be a good reason for an installer to have one of those
FLIR (or similar) thermal
hot with the imager.
I just wish they were cheaper !
boB
boB Gudgel wrote at 01:00 AM 6/1/2011:
This might be a good reason for an installer to have one of those FLIR (or
similar) thermal imager cameras.  They're a bit on the expensive side, but
could
really be helpful for so m
is is done in the EV business.
Larry Crutcher
Starlight Solar Power Systems
11871 S Fortuna Road, #210
Yuma, AZ 85367
la...@starlightsolar.com <mailto:la...@starlightsolar.com>
(928) 342-9103
On May 31, 2011, at 11:16 PM, boB Gudgel wrote:
OK, I've been hearing for years now that one ba
n was system
reliability and redundancy and the idea of a single string failure was
a big worry which is why I never would consider it.
Tom
*From:* boB Gudgel <mailto:b...@midnitesolar.com>
*Sent:* Tuesday, May 31, 2011 8:16 PM
*To:* RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org&
OK, I've been hearing for years now that one battery string is best and
maybe two but no more should be used.
What is the reason for this fear ???What is the experience with
multiple strings in parallel ??
If it is because of current sharing of the strings, that shouldn't be an
insurm
Just as an aside, today's inverters are pretty much a Class D audio
amplifier anyway.
An inverter ~could~ actually be used for a subwoofer amplifer in some
cases.
I've always wanted to have an inverter with an audio jack on it just for
that and actually
did try that back a Trace Enginee
On 4/27/2011 4:50 PM, Starlight Solar, Larry Crutcher wrote:
Benn,
I've had requests like this in the past and have found in EVERY case
the customer has no idea that it will take a
$$$multi-tens-of-thousands to replace the generator power. If you have
the estimating experience, throw out a ver
On 4/27/2011 3:51 PM, benn kilburn wrote:
Wrenches,
I have been asked about sizing PV systems for a couple different music
festivals that have been run solely off of generators in the past.
The problem i'm having is determining the energy consumption of
music/stage (amps, speakers, lights, et
On 4/25/2011 8:56 AM, Mark Frye wrote:
Folks,
I have an Enphase D380 micro inverter sitting on my workbench (such as
it is).
With my ohm meter I can detect continuity between the chasis and the
AC equipment ground pin, between the chasis and the DC- pin, and
between the AC equipment ground
On 3/26/2011 9:32 AM, Dan Fink wrote:
Mark;
An example:
http://tinyurl.com/4p4367b
and a whole home package! Even includes a Kill-Watt for all your
energy production monitoring needs:
http://tinyurl.com/4qgogt9
And for an added bonus if you read now, one for a direct grid tie wind
turbin
On 3/19/2011 7:53 AM, Drake wrote:
Hello Wrenches,
I had an inquiry concerning the effect of EMP on photovoltaic
systems. We are heading for a period of solar activity that likely
will produce this effect. According to a local AEP (American Electric
Power) representative, the utility is spe
On 2/8/2011 3:40 PM, David Brearley wrote:
However, the term "panel" does appear in the NEC in the context of Article
690 "Solar Photovoltaic Systems." (You'll have to submit a proposal to the
Code Making Panel to change the name of the Article, Michael.) Panel is
defined a "collection of modules
On 2/5/2011 11:30 AM, Greg Egan wrote:
Fellow Scientists,
I got in a discussion with a wrench the other day. He is under the
impression that when a PV module is at short circuit current there is
no voltage. My understanding of electricity is that if there's no
voltage there's no current bec
On 1/28/2011 8:41 AM, Solar Energy Solutions wrote:
Joel,
Our company cannot survive without selling an entire system. When we
help the unqualified and untrained we legitimize unsubstantiated pv
businesses. We get a dozen phone calls a month from folks wanting us
to install their systems.
On 11/20/2010 4:36 PM, Mark Frye wrote:
From the 2006 white paper:
*
"Polarization
*
Incorrect grounding of SunPower modules can inducea surface charge
which would lower the energyproduction. Previously SunPower has
announced the
discovery of the "surface polarization" effect which creates
On 11/19/2010 5:22 PM, Glenn Burt wrote:
It has been my experience that if Sunpower modules are installed
contrary to their manufacturer recommended positive ground
configuration, that in a short time you will only be generating a few
watts. I have seen this in more than one instance when the
K. Not the
best way, just
a quick and dirty way. And even then, it's not quite the same as a PV array.
Just an approximation.
boB
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of
On 11/16/2010 11:20 AM, Richard Scott wrote:
The KACO blueplanet 1502xi inverter has a minimum MPPT voltage of
125Vdc but cannot be connected to a battery.
I would not recommend hooking a battery up to the input of just any
grid tie inverter unless it was designed for it.
The current from a ba
On 10/22/2010 10:25 AM, Allan Sindelar wrote:
Ray,
I don't think Robin has posted anything, it just came in a
conversation we had. As I understand it, service equipment must have
nothing interfering with designated working clearance, within a few
inches of depth allowed. With Outback, Magnum,
On 10/20/2010 12:16 PM, jay peltz wrote:
Hi Jeff,
Its not the voltage but amps, the apollo is only 80amps, and the old
MX's you can push to 70 so no real advantage there.
j
I think that what he means is that by switching to a 48V battery you can
have (add)
twice as much array power ratin
simply showing up on site
and randomly selecting various aspects of the product for verification
-- including the software.
The overall UL1741 certification process is extremely complex, very
time consuming, and quite expensive.
Dan
--- On *Fri, 10/8/10, boB Gudgel //* wrote:
From: b
On 10/9/2010 3:07 PM, Carl Hansen wrote:
Greetings,
Does anyone know if newer Macintosh computers are still
incompatible with Modsine inverters, and how about Mac loptops ?
Thanks,
Carl Hansen
Hansen&Sun elect.
My Mac Book Pro (from early 2009) worked off of a c
On 10/8/2010 6:04 PM, Matt Lafferty wrote:
Hola Wrenches,
Does anybody know off the top of their head if the
/"5-minute-wait-to-interconnect"/ function is tested on 100% of
inverters produced? /(i.e. every single inverter is tested with AC &
DC within the start parameters of the unit for at l
*boB
Gudgel
*Sent:* Monday, September 06, 2010 12:44 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] RE Visio shapes files
On 9/5/2010 9:32 PM, William Miller wrote:
boB:
I have a set of template and stencil files on my web site at:
http://www.millersolar.com/resources/resources.html
I
On 9/5/2010 9:32 PM, William Miller wrote:
boB:
I have a set of template and stencil files on my web site at:
http://www.millersolar.com/resources/resources.html
I never progressed beyond version 4.1T because it still works for me.
You are probably using a newer version, but these files sh
Hello Wrenches.
Do any of you know where to find shape library files for drawing RE pix
in Microsoft Visio ??
Solar, Wind, batteries, etc...
Thanks,
boB
___
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
O
On 8/27/2010 7:51 PM, cvso...@aol.com wrote:
Help!
Has anyone delt with RF interference between a dog control device
and GVFX3524. It seems that some frequency in the inverter (or maybe
the FlexMax 80) is cancelling the emitted signal from a dog control
device which shocks the dog when th
Jeff Oldham wrote:
I have seen this on my last 3 MX60 controllers and it is very
frustrating and looks to be a design flaw. I can calibrate the meters
to be accurate at either the Absorb point OR the Float point but NOT
both!! Not only that but the meter calibrations tend to drift a bit in
jus
Drake Chamberlin wrote:
boB,
Thanks, I will check all connections when I get out there. Is there
anyway a loose connection could cook the batteries?
A loose connection, if it was like I described, would tend to
under-charge the batteries. I would think that
if there were ~that~ much of a
Drake Chamberlin wrote:
I called her back just now, and the voltage readings on the Mate, MX
and Trimetric all match. Humm.
The batteries are 4, 4 1/2 year old, U.S. Battery L-16s wired in 24
volt configuration. It seems that I remember postings of Wrenches
having problems with these batte
Joel Davidson wrote:
Interesting news item, but the link does not connect to the fire
fighter report. Does someone have the correct report link?
In May 2010 the Fire Protection Research Foundation (FPRF) completed a
one-year research project addressing photovoltaic (PV) power systems.
The repo
Darryl Thayer wrote:
That is a good question, I have not an answer, but of course it should
be based on the amp hour of the battery bank, absorb charging voltage,
and of course the charging source in the case of generators.
Following Ron's advise start at C/5 for SOC less than 50% then C/10
t
Richard L Ratico wrote:
Interesting question, Mick. It may depend on the point in the cycle when the
transformer lost power and the duration of the blip.
Dick Ratico
--- You wrote:
Before I present a suggestion, here's a question:
If by chance William is able to energize the transformer witho
toddc...@finestplanet.com wrote:
Don't you think the transformer is good for isolation?
Todd
I like transformer isolation, but I suppose as long as the neutral of
the generator is
tied to ground and battery negative you'll be OK.
As far as capacitors go, there is usually plenty of capacitan
Jeff Yago wrote:
First let me say that we almost never work on failed systems,
especially when its for somebody that picked our brains on pretense of
buying a system, then they went out and bought everything on the
internet, and when nothing worked they call us!
Also, let me say that the foll
s trying to find it in the
NEC, but it isn't there. I'm going back to my myth!
Robin Gudgel
boB Gudgel wrote:
Forwarding a message from Robin Gudgel...
Robin Gudgel wrote:
The CBI QY series of DC breakers have an arc shoot that is required to
quench a DC arc. This breaker would
Forwarding a message from Robin Gudgel...
Robin Gudgel wrote:
The CBI QY series of DC breakers have an arc shoot that is required to
quench a DC arc. This breaker would work just fine as an AC breaker although
is not marked as such. I am not sure if the AC breakers (QL, QZ and QZD
series) have
er than prim power classes, are
more of
a backup. If they wanted to, they could just use the run time meter to
decide if it is warranty or not, maybe.
Thanks again,
boB
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wr
tartar
with that fish, please.
Thanks guys.
boB
Jason Szumlanski
Fafco Solar
Southwest Florida
Original Message
Message: 3
Date: Tue, 30 Mar 2010 12:07:28 -0700
From: boB Gudgel
To: RE-wrenches
Subject: Re: [RE-wrenches] Kohler Generator Issues
Message-ID: <4bb24bf0.7000...@midniteso
Nick Soleil wrote:
Hi Jeff:
I have had some similar issues with the Kohler generators in
recent years, after installing hundreds of air cooled and water cooled
generators from them. I have heard that they are less reliable now,
and the company is harder to deal with now.
Recently, I t
--- On Sat, 2/13/10, August Goers wrote:
From: August Goers
Subject: [RE-wrenches] anti islanding?
To: "RE-wrenches"
Date: Saturday, February 13, 2010, 10:29 AM
Hi Wrenches,
Does anyone know where I can go to read about general
information on how grid tied inver anti islanding works? I
tances of people
experiencing distress from inverter operation just to rule out the
possibility -or take it into account.
I know that some people are becoming more sensitive to
environmental influences but this inverter is quiet, just the usual
fan sound occasionally. I used to be able to hear
nfluences but this inverter is quiet, just the usual
fan sound occasionally. I used to be able to hear the sound of an
ultrasonic alarm system back when I was in my 20's & 30's - now I
just hear ringing in my ears.
Ron
On 4-Feb-10, at 1:30 AM, boB Gudgel wrote:
Dan F
e sound of an
ultrasonic alarm system back when I was in my 20's & 30's - now I
just hear ringing in my ears.
Ron
On 4-Feb-10, at 1:30 AM, boB Gudgel wrote:
Dan Fink said:
"That's a tricky situation. There are only two possibilities
for what's causing t
Dan Fink said:
"That's a tricky situation. There are only two possibilities for what's
causing the problem; sound or electromagnetic radiation"
I'm betting that it's sound. Remember how you could hear televisions
singing
away at 15 kHz ?? That still gives some people headaches.
How old i
Ian Woofenden wrote:
This is one of my pet peeves too...
A few snippets and observations from my frequently given electrical
terms presentation:
If I asked you "How far is it to Vancouver?" and you answered "45
miles per hour," everyone listening would know that someone was
confused. But w
swingjun...@gmail.com wrote:
Thanks to all who responded,
The article Marco references, is the one referenced in the tinyurl in
my original post. I did not find anything of significance in the
previous Solar Pro issues. Based on the responses it seems there is no
good data out there to answer
Antony Tersol wrote:
Assume 3 parallel battery stings, with identical batteries of internal
resistance r.
Assume identical wire leads of resistance R.
Then when the batteries have the same state of charge and their
internal resistances are equal, one can solve for the current in each
string.
Brian Teitelbaum wrote:
William,
The SW Parallel Stacking Interface (SWI/PAR) was much more than just a
cable (like the Series Stacking Cable -SWI). it was a separate box,
like the Grid Tie Interface (GTI) unit was. It retailed for about $345.00
Good luck finding one.
Brian Teit
Jeff Yago wrote:
There have been some good advice related to battery bank sizing and a better
description of how Sunny Islands work with SunnyBoys, but I am afraid we are
getting away from my original post that started this and that was:
Since a battery based inverter has a battery charging se
boB Gudgel wrote:
Jason Lerner wrote:
Hi Bob,
I put on an old Todd charger with Voltage regulation, but not absorb
and float. I can change the voltage up or down as needed. Changing
out the remote is a good idea. I do have another Magnum inverter at
another location, but was trying to
Jason Lerner wrote:
Hi Bob,
I put on an old Todd charger with Voltage regulation, but not absorb
and float. I can change the voltage up or down as needed. Changing
out the remote is a good idea. I do have another Magnum inverter at
another location, but was trying to avoid another couple
Conrad Geyser wrote:
We always fill any conduit at the point of building penetrations for
air sealing. Otherwise in winter, not only will the conduit get house
moisture condensing inside of it, but it will act a a nice thermo
siphon for pulling warm air out of the house…..
Just a note her
Keith Cronin wrote:
http://www.helixwind.com/en/index.php
Anyone have any feedback on these?
Thanks
You might as Mick Sagrillo. He's evidently doing some consulting for them.
http://www.helixwind.com/en/newsDetail.php?nid=62
Although, I bet that Helix Wind will have anybody working for
's active, electronic PFC.I probably won't be around to
see, but I bet that high temperature
superconductors will play a big roll in reducing all losses.
boB
Brian Teitelbaum
AEE Solar
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches
Drake Chamberlin wrote:
One question about power factor:
We know it is the ratio of the real power to the apparent power, and
that most utility meters only register real power (watts). Reactive
power doesn't dissipate as heat like power loss through a resistor.
The question is: What is the
Marv Dargatz wrote:
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
Matt Tritt wrote:
Darryl,
Say what?! This would seem to indicate that solid core is actually
better for DC than stranded wire. Can this possibly be true??
Matt
The reason that stranded is higher resistance than solid is that there
is more "air" in between the strands. Solid
wire doesn't
Wind-sun.com wrote:
See http://en.wikipedia.org/wiki/Eddy_current
The practical effects of running a single wire in 98% of the systems
that any solar installers will ever see is probably just about zero,
and it also only applies to AC currents (or rapidly varying DC, which
is not common).
Wo
pretty fundamental cabin, so the TV and DVD
player are
the most exotic things plugged in. The run to the pump is
adequately
sized - - - - - in other words, it all seems run of the
mill, except
that the pump only ran successfully one time and not on any
further
attempts. Golly..
Matt
boB Gudge
Matt Tritt wrote:
The next time I'm up there I'll take another tech with me, plenty of
meters and go through every DC and AC connection (they all looked good
first time around) to try and get to the bottom of the problem prior
to taking a harder look at Magnum. I have to say, though, that I hav
g the peak
DC voltage seen at the inverter terminals due to L-C resonance.
boB
--- On Sat, 8/1/09, boB Gudgel wrote:
From: boB Gudgel
Subject: Re: [RE-wrenches] Magnum inverters (not really a power factor issue)
To: "RE-wrenches"
Date: Saturday, August 1, 2009, 6:22 PM
Larry Crutcher, Starlight Solar wrote:
Hey Matt,
I sure wish their techie's would get to the bottom of it. I am getting
gun-shy about selling Magnum and they are about the best available for
small 12 volt systems. I have spend hours trying to solve the problem.
My customer is still not a happ
a power factor deficit,(I think not), a
motor starter problem or an inverter issue? I have to admit to being
somewhat baffled by this one because it ran the pump once, but not after.
Matt T
boB Gudgel wrote:
boB Gudgel wrote:
>>So, because of the different ways of specifying PF,
jay peltz wrote:
Hi Darryl,
But what are the differences and when do they come into play?
Question interruptus and my 2 cents worth, Jay...
Except for REAL long lines, like utility transmission lines, the AC skin
effect, which is what I think
you might be referring to here, is probably not
North Texas Renewable Energy Inc wrote:
August
I made a service call to a residential PVinstallation several years
ago that I did not install. The vintage Trace, size I don't recall,
had quit working. The Delta surge suppressor had actually ruptured
along it's radial seam, a result I had alway
lto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of boB Gudgel
Sent: Thursday, July 30, 2009 4:45 PM
To: Matt
Cc: RE-wrenches
Subject: Re: [RE-wrenches] Power Factor
Matt wrote:
Possibly a PF question, or maybe one for Magnum - boB,
One of the guys at work is (almost) running a 3/4 hp s
CBI breaker ?
boB
On Jul 30, 2009, at 4:03 PM, Matt wrote:
Unh - hunh, but it will run on the generator. If it didn't, I would
go for the bad starter or motor, but it "seems" like the PF could be
an issue??
Matt T
boB Gudgel wrote:
Matt wrote:
Possibly a PF ques
oltage drops to zero
or at least very low.
boB
boB Gudgel wrote:
Matt wrote:
Possibly a PF question, or maybe one for Magnum - boB,
One of the guys at work is (almost) running a 3/4 hp sub pump with a Magna AE
48. Or rather, he isn't. According to him when he first
hink not), a motor
starter problem or an inverter issue? I have to admit to being somewhat baffled
by this one because it ran the pump once, but not after.
Matt T
boB Gudgel wrote:
boB Gudgel wrote:
>>So, because of the different ways of specifying PF, it is always best
to th
boB Gudgel wrote:
>>So, because of the different ways of specifying PF, it is always best
to think of Power Factor as being the ratio of real (in phase) power, or
VA to reactive power >>(VARS or "Volt Ampere Reactive"). That will
work in all cases.
OOOps ! See,
ants Power factor to be close to 1.
Obviously there isn't PF on DC, and it is my understanding that most
inverters can operate at most power factors.
Not 100% sure, but I think GT inverters would help not hurt the PF
problem in most situations.
Correct me on any and all of this, Oh fellow w
Ron Young wrote:
Ok, so all seem to be in agreement more or less. How do I break it to
British Columbia Hydro? :-|
I think they must be misunderstanding what they are asking for but the
question is in the section for PV and on the same line as the total
output in Kwh of the PV. Power Factor %
Nick Lucchese wrote:
Wrenches,
While we're on the subject of CBI breakers does anyone know a sure way
to distinguish between the AC and DC versions? Depending on the order
we get our stock from both Outback (or Outback vendors) as well as
directly from Midnite. It's obvious with Midnite's 150
Allan Sindelar wrote:
Dan,
My understanding is that CBI breakers aren't based on a temperature-related
mechanical action, but a "magnetic-hydraulic" function. I recall that this
was marketed (by Outback? Robin?) as superior to thermal-trip mechanisms as
it was not prone to heat-induced nuisance t
Kent Osterberg wrote:
Allan,
I've had trouble with breakers opening when they shouldn't. On an
array of two strings of Mitsubishi 175s (Isc = 7.9A) I had two 15-A
breakers open. Last week, I had a low-power call from a customer with
three strings of Evergreen 190s (Isc = 7.1A); one 15-A bre
toddc...@finestplanet.com wrote:
"If neither pole is grounded then both must be treated as potentially
hot."
_Only with regard to the other hot wire._ If you do not reference one
conductor to ground than the other one will not present any danger
unless you are referenced to its mate... as in
Darryl Thayer wrote:
The reason for grounding to limit the hazards associated with fault conditions. If a utility source is unintensionally connected to high voltage the pair of wires can be at elevated voltage. example would be if a 13,000 volt line falls onto a 120 volt line, the 120 volt line
On Jul 23, 2009, at 12:58 PM, boB Gudgel wrote:
Larry Crutcher, Starlight Solar wrote:
Hi Jay,
An interesting quandary indeed.
This is another good example of an application that I was trying to
grill Sunpower about --- as far as grounding their modules that need
to be positive grounded
Larry Crutcher, Starlight Solar wrote:
Hi Jay,
An interesting quandary indeed.
This is another good example of an application that I was trying to
grill Sunpower about --- as far as grounding their modules that need to
be positive grounded
in order to take advantage of their higher efficienc
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