HI Dave;
Based on the evidence, I might suspect a short in the inverter, or the
inverter was feeding a heavy load when the melt down occurred. I can't
see how a short at the battery would cause an inverter failure, unless
the melted lead caused the polarity to be reversed, or created a
positi
When I'm evaluating an old system, one thing I do is really yank on all
the battery connections. If it turns, tighten it down, and in several
cases, the cable just pulls loose from the connector. They are time
consuming to do right. Cable has to be stripped long enough, the
crimper needs to
117 vac is perfect output. If the washing machine is having issues, it
would be with the stepped waveform, not the voltage. The old Trace had
a pretty choppy "pure sine wave". I had washers not run on the Trace
SWs, and we were able to put a capacitor on the inverter output that
fixed the pr
Let Ebay decide. I sold an old SW4024 on there recently. I got $1500
for it, so I'd guess the Outback might be worth $1100?
Ray
On 12/16/2011 3:38 PM, Drake wrote:
A friend has a very early Outback 2024 FX that he is thinking about
selling. It sat in the original box until last
apter that would let
me use that type of breaker on the Flexware box?
Ray Walters
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landing a 1/0 cable, I could see it was my problem. But you can't put
less than a #4 on an 80 amp breaker last time I checked, so the breaker
should be able to hold a #4 with some normal bending and jostling that
installations cause.
Ray
On 12/17/2011 8:39 AM, jay peltz wrote:
Hi Ray,
Th
n the load side and be code compliant.
Ray Walters
On 12/22/2011 11:34 AM, Pekka Laine wrote:
All,
We have been contracted to install a 10kW-ac system into a 45-year old house that
has no main service breaker panel, only a 200A fused main switch (Zinsco). There
are five 125 A rated
x27;s not a service upgrade (you're still at 200 amps),
you've made the house much safer, and you've fixed your PV intertie
issues as well. Besides being PV installers, we ARE electricians, and we
should be fixing bogus wiring when it also benefits the PV install.
Then all of us cou
Original Message
Subject: Re: [RE-wrenches] Landing into a sub-panel without a main
service panel, just a main switch
Date: Fri, 23 Dec 2011 09:41:24 -0700
From: Ray Walters
To: JRQ
HI Jeffrey;
Electricity certainly can flow in both directions on a conductor
what this list is all about. We're always open to
new views.
Ray
If there's evidence that shorts or ground faults commonly develop with
a resistance this high, causing sustained arcing, and that the
marginal difference in resistance in our example, and in most system
scenarios, makes
d
in a week delay, and another unpaid 2 hour round trip to fix.
(Outback or Carling care to cover my costs?)
My 2012 resolution: Quit losing money fixing other companies'
problems
Ray Walters
NABCEP Certified Installer
BS Mechanical Engineering
First In
That's great;
As a company, I'm willing to pay more for the breakers with the better
posts, because it will be much cheaper in the end.
Ray
We have just requested that Carling start providing real studs on all
of our C series breakers (MNEDCXX).
boB
Midnite Solar
On 12/27
I, 2nd Allan's recommendation, or better, use sealed batteries, since
its battery backup, and so small. People are bad about battery
maintenance on anything but off grid. You definitely can't afford to
have hydrogen sulfide going up through the building.
Ray Walters
On 12/31/20
We've only had to use Schedule 80 out of the concrete, but never
otherwise had a problem. Is his concern the structure of the concrete?
It's ballast, not a pier that takes a compressive load. We've never had
a problem in 2 decades.
Ray
On 1/3/2012 11:48 AM, Jeff Yago wrote:
e a deadly H2S
buildup. (the code is definitely missing the point on that one)
Ray
On 1/3/2012 2:04 PM, jay peltz wrote:
Hi All,
We've been having this discussion about battery box explosions.
I would like a show of hands who has actually seen or truly known of a battery
enc
I've only done it that way when some Bozo forgot to install the conduit
in the concrete. Definitely not the preferred method.
Ray
On 1/3/2012 3:19 PM, Drake wrote:
At 01:48 PM 1/3/2012, you wrote:
This is a very common way to install this conduit, so I really would
like to know how
e back and done testing with my insolation meter, so
I'm not sure exactly what is happening, but his overall efficiency (STC
rated to AC out) is only 56% .
Ray
On 1/4/2012 7:55 PM, Maverick Brown [Maverick Solar] wrote:
Please use the 90% of the CEC or PTC rating of the PV module at most.
A
re, I
would pay a bit more for a breaker that didn't snap off in the field, as
its way cheaper than a return trip on an off grid project. Its always
nice to feel like we wrenches in the field are being listened to. We're
really trying to make this better and safer for everyone involved
I have only limited experience with the GIllette, but I was impressed
with the specs on that 15 Kw unit, it was a water cooled 4 cyl running
at 1800 rpm, just what your customer needs, but probably way more than
they want to spend.
Can you add more PV to reduce the generator run time?
Ray
On
Hi Mark;
Robin Gudgel at Midnite was talking about a setting on the Classic that
could do that. I'm not sure how far they went with the concept, but it
definitely is beyond mere theory. I'd check with them, and see where
they were at with that.
Ray Walters
On 1/16/2012 11:0
lumbed
to larger pipe with about double the flow rate.
Ray
On 1/16/2012 11:59 AM, Kent Osterberg wrote:
John,
Thanks for the follow-up on this subject. I'd like to change the
example to show the ventilation required rather than the hydrogen
liberated.
Consider a 48-volt bank of L16RE-B ba
l slots are filled with PV breakers,
you're off the hook, at least according to Mike Holt, and my self for
the little that matters ;-)
Now you have to convince the AHJ, so you might want to show them Mike's
book on the subject.
Ray Walters
On 1/22/2012 2:13 PM, Rich Nicol wrote:
My take o
That's always been my interpretation as well, reinforced at seminars
with John Wiles and Bill Brooks.
Ray Walters
On 1/23/2012 6:13 PM, Dave Palumbo wrote:
Regarding NEC Article 250.30 Informational Note #1 //
//
My interpretation is that a standard net-metered PV system is
therefor
the definition of separately derived
system.
In the end, I don't believe it matters whether we consider the DC side
to be separately derived or not, as 250.30 only applies to AC, and 690
is now fairly clear about bonding and grounding requirements regardless.
Ray Walters
On 1/24/2012
sell some battery
amp-hrs at $1/ kwh every once in a while.
Ray Walters
On 2/4/2012 7:05 PM, b...@midnitesolar.com wrote:
Sounds like a voltage source (and sinking) inverter to me.
These types can cause current distortion which the UL1741 / IEEE 1547
specs try to prevent.
Apparent must
Hi Chris;
Marco Manglesdorf (on this list) is the man to talk to about that. He
is based in the Hawaiian islands; I only had the good fortune to work
for him for a few projects.
Ray Walters
On 2/6/2012 5:30 PM, Comet Systems wrote:
Ray,
The idea that the utility in an island is seeing an
Hi All;
I just had a customer ask if he could take the federal solar credit for
his PV system on his newly built off grid home.
I always thought you could, but the wording on the IRS form sounded a
bit like you couldn't take it for new construction.
What's the group's opinio
buzz from the several LEDs I have in
my basement studio.
Ray
On 2/9/2012 4:54 PM, toddc...@finestplanet.com wrote:
i have some personal experience with led light bulbs. i put them
outside because the cfl floodlights are very s-l-o-w to warm up to
full brightness.
1) leds are still sli
No, both golf cart batteries and industrial cells get more cycle life per $.
Ray
On 2/14/2012 1:18 PM, William Miller wrote:
Colleagues:
Do any of you have experience with Interstate L-16 batteries? Are
they a good value?
Thanks in advance,
William Miller
e fully
discharged. I don't really know about the Concordes.
Ray
On 2/15/2012 10:53 AM, Allan Sindelar wrote:
Esteemed fellow Wrenches,
We need to size a battery bank for a GTWB just for starting a well
pump. The well is on its own meter, so as long as the battery voltage
does not cr
without over paralleling or breaking the off grid spinster budget.
Ray Walters
On 2/16/2012 6:39 AM, John DeBoever wrote:
Wrenches,
Drake,
Trojan Premium lineL16RE-A, L16RE-B and L16RE-2V are optimized for
renewable energy applications. They offer 1,600 cycles @ 50% DOD @ 77F.
For details
e old bank to a
neighbor, or use it on a separate system.
Ray Walters
On 10/11/2012 5:51 PM, SunHarvest
wrote:
Thanks Allan,
I always value your insight.
There is a TriMetric on this system but I'm look
say the attic, it will interrupt the electricity at
its source, not at the load.
Ray Walters
On 10/13/2012 9:12 AM, Rebecca Lundberg wrote:
Dear fellow wrenches,
Does anyone have suggestions for the 'best' way to keep up with
product availability for meeting 690.11 on DC AFCI? I
n the Outbacks.
Yet another thing to consider is changing the load. That saw might work
just fine with a 2 Hp motor.
Ray
On 10/14/2012 6:54 AM, d...@foxfire-energy.com wrote:
I like Outback because I can rebuild them on the wall. I'd be eying
two VFX3648 (Or VFX7248 is what they used to ca
de of the shunt.
Ray Walters
On 10/15/2012 9:21 AM, jay peltz wrote:
Hi Mac
Check out midnight they have exactly what you need
Jay
Peltz power
Sent from my iPad
On Oct 15, 2012, at 5:24 AM, mac Lewis <mailto:maclew...@gmail.com>> wrote:
Hi Wrenches,
I am looking for a >500A DC
an other wiring.
Ray Walters
On 10/26/2012 12:02 PM, benn kilburn wrote:
Glenn/Jason,
So you wouldn't use romex to feed an exterior outlet on an outside
wall, or to any outside lights???
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's sounding like you might
be headed a bit far in the over kill direction.
Ray
On 10/26/2012 1:35 PM, Ryan Harkins wrote:
Hey Wrenches,
I planning some AZ-225 tracker installs, and I would like to avoid
full excavation for slab/pier type and opt for the drilled pier
option. The pie
So if the Romex is loaded with THHN/THWN (damp/wet rated), and no where
does the outer covering of the Romex itself get exposed to the wet
location, that should be sufficient?
Ray Walters
On 10/26/2012 7:45 PM, Glenn Burt wrote:
300.9 Raceways in Wet Locations Above Grade.
Where raceways
eelings if they don't last very long.
A solid load capacity test would tell you a lot more about them.
Ray Walters
On 11/12/2012 3:55 PM, Allan Sindelar wrote:
Wrenches:
First question: for a large grid-tied with battery backup system (9.8
kW array, two SB5000s, dual Sunny Islands), we h
HI Todd;
That's very interesting. What roof pitch does that happen? I'm
guessing that at a step enough tilt, the frame damage is alleviated?
Also on your tall pole mounts what pole design do you use? I've tried
telescoping type, and guy wires on tall poles.
Ray
On 11/1
Thanks for the pitch info, very helpful. Are you using a heavy wall
thickness on the pole? I thought with DP &W we could only go 6 ft out
of the ground without increasing the pole size or adding bracing.
Ray
On 11/13/2012 4:21 PM, toddc...@finestplanet.com wrote:
ray,
this has be
ye opening arc flash.
(No gloves, no tinted safety glasses) It ended up becoming an OSHA
recordable for the company he worked for.
Ray
On 11/24/2012 10:11 AM, Glenn Burt wrote:
Probably silicon gel would be a better choice.
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hand held LED flash light that is as bright as my car
headlights (1100 lumens) and I still haven't charged its Li+ battery in
6 months. LEDs are the future amigos.
Ray Walters
On 12/5/2012 8:33 PM, William Dorsett wrote:
In the early days, LED's were rated by the candela and so
in winter
scenario will probably cut the run time down by 80%. I've done that
same trick, and the customers loved it, but they moved it in in the
summer as it ran too much in the summer in 85 deg weather.
Ray Walters
On 12/10/2012 9:12 PM, Allan Sindelar wrote:
Wrenches,
We still t
#x27;s built in
low voltage disco keeps the batteries from getting ruined if the charge
system is down, but loads stay on.
I lived for years with a DC fridge, and my family has no desire to go back.
Ray Walters
12/11/2012 12:54 PM, Jason Lerner wrote:
Hello Larry,
I still install DC fridge/
he kids that
day. Less attention, then we skip the wiring, for example.
Ray
On 12/12/2012 8:39 AM, Stephen Kane wrote:
Jason,
Similar to Karl's suggestion, we have built a few education systems with a
small PV module direct to a 12 VDC bilge/sump pump like the Rule models
(with some fus
re. My overall foot print is
less than building a new "efficient" home out in the vanishing wilderness.
I've tried it all, and that's just where I landed for now. I'm
currently working on an off grid PV charging system for a customer's
Chevy Volt, though, so I&#x
company
that has been doing tracking right for decades.
Ray Walters
On 12/15/2012 10:59 AM, Bill Turberville wrote:
Does anyone have suggestions for a 50KW single axis tracker system.
This is going on top of a berm that does not run east-west
of AC coupling as others noted is also a decent option, but
when I last looked, it is much more expensive.
Charge controllers are much cheaper per watt than inverters for a 48 vdc
battery.
Ray Walters
On 12/17/2012 12:15 PM, William Miller wrote:
Sure we'd all like to be able to p
structure. I think combining these will become more common place
in the future.
Ray Walters
On 12/21/2012 7:40 AM, Drake wrote:
Another approach that customers have opted for is to build a carport
or outbuilding. The money spent toward a rack can be used to make
the array location a multi use
, but I would
imagine it would have a voltage dip on surge too.
Perhaps some capacitance might help too?
Ray Walters
Solarray, Inc.
On 12/23/2012 8:45 AM, Howie Michaelson wrote:
Hi All,
I am trying to help my brother-in-law figure out if he can continue using
his Magnum MS 4448 AE in his
e anchors if you wanted to get anal.
http://www.northerntool.com/shop/tools/product_120532_120532
Ray
On 12/23/2012 10:03 AM, Mac Lewis wrote:
Hi Wrenches,
I am working on a project right now where we need to figure out how to
put an 8kW ground mount on a property that is covered with a sandston
I've had clients freeze water outside for years and bring the ice (in
gallon jugs) in to the fridge. It cuts the run time by at least half
and is free. I've also done the chest style freezer conversion to
fridge, but people don't like that as much.
Its hard to use the space.
f the rail, it acts as a
decent cable tray.
I've used Haticon and it has some advantages, but also its own problems:
their clamps are not the greatest.
Ray Walters
Solarray, Inc.
On 1/18/2013 3:04 PM, August Goers wrote:
All -
This thread brought up a question I've been mulling o
Hi Hilton;
Can you share any Pics? Sounds just like what I was thinking of making.
Ray Walters
On 1/18/2013 3:40 PM, Hilton Dier III wrote:
I made a pair of jigs out of some two foot lengths of 20-80 (That 1"
square aluminum extrusion with bolt slots on each side) and some
unequal-leg
, but that was about it, for that little corner of the still
wild west.
Ray
On 1/20/2013 7:51 AM, Dave Palumbo wrote:
Marco,
Here in Vermont no schematic is required for residential PV system
installations. There is a simple CPG process (Certificate of Public
Good, which is automatically
PV you can throw at an off grid project these
days for $10k.
It almost makes messing around with the old modules a waste of time.
Perhaps the solution might be to remove old arrays for customers wanting
to really up size, and then reuse the old modules for small systems?
Ray
On 1/24/2013 12:3
Blue Sky's 1524 and 3024 work with 60 cell mods, and have 12 or 24 v
output. I have a several 3048s that have been in service for over 12
years, no problems.
Ray
On 1/24/2013 3:07 PM, Allan Sindelar wrote:
Larry,
Yes, but isn't it 12V-only output? When I called Rick Cullen to ask
Hi John;
Would we not need an MPPT controller, just a regular PWM type,
then? That might be a solution for these democracy arrays.
Ray
On 1/24/2013 3:16 PM, John Berdner wrote
or doesn't have full output at 120 v, so you need
a transformer to get a balanced full output from it. Maxing out one
leg, while the other leg is unloaded will eventually cause uneven wear
of the generator.
Ray Walters
On 1/27/2013 4:20 PM, toddc...@finestplanet.com wrote:
just curious...
Those look interesting, especially the 20 Kw unit that is 1800 rpm.
How's auto start, is it two wire?
Does it have a no load draw for its electronics like the other newer
standby generators?
And finally does the warranty still apply for off grid use?
Thanks,
Ray Walters
What On 1/29/2
I just found Generac's Off grid model 6 Kw. I know I've heard nothing
but $%& about Generac, but this unit appears to actually be designed
specifically for off grid, and has a special oil cooling system and
runs at 2600 rpm. Anybody dare try one?
one. Kohler used to make a 6.5 Kw that fit the one inverter household
fairly well.
Ray Walters
THeOn 1/30/2013 8:55 AM, Larry Crutcher, Starlight Solar Power Systems
wrote:
Randy,
I concur, the Cummins/Onan generators are built well and are reliable.
They provide a 1 year, 1000 hour warranty fo
tronics to go bad either.
Ray Walters
On 1/30/2013 3:02 PM, penobscotso...@midmaine.com wrote:
From an environmental standpoint I would always recommend propane over
diesel because of spillage and diesel fumes. I believe propane is much
cleaner burning, although likely the CO2 is probab
tely an
option, but last time I used one, they were not UL listed or set up to
wire in a code compliant manor.
Ray Walters
On 1/31/2013 3:13 PM, Allan Sindelar wrote:
William,
Yes, that's my understanding. Outback acknowledged this to me years ago.
Allan
*Allan Sindelar*
_Allan@positiveen
with current
calculations that corresponded to NEC 2011, alas that computer was
taken, before I ever backed it up. Maybe I should take another
stab at it. I'll incorporate your metric info too. I guess this
is what they call "open source" development.
type
breakers (like Outbacks) can have multiple lugs on the same stud, or use
a double barrel lug.
Thanks for your help,
Ray Walters
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there that might allow double lugging, or other types of splices
besides uninsulated ILSCOs? For larger wires, I've used an insulated
piercing type tap, but I haven't seen those for small ga. wires like for
adding a lightning suppressor.
Ray
On 2/4/2013 4:59 PM, Glenn Burt wrote:
Several types of lifts are available at rental yards. We've used a hand
crank type air conditioner lift to move 8 modules up at a time. For
anything over 10 modules, its really a good idea to use something
besides a man on a ladder, especially with today's larger modules.
--
R.Ray Walters
CT
I've got a project right now on a steel roof. I was just at a trade
show last week, so I got to look at the latest gizmo from S5.
I didn't like it at all, it didn't go into the valleys like the old
mount, but drilled 4 holes into the side of the ridge, and just counted
on the roofing to hold th
or
808 269-7491
On 2/18/2013 11:08 AM, William Miller wrote:
Ray:
We use the Simpson 1/4 by X" "Strong Drive" (SDS series). We get
them in the hot dip galvanize version. They are readily available
locally. I think building officials like the Simpson name on
structural produ
I'd try a set with a few adventurous customers, but the price needs to
be really good for Beta testing. Once you get a couple of years of
proof of concept, and work out the charging details, etc. then your
friend could set the price higher. Its all about amp hours and cycle
life. If he can p
Hi William:
I'm working on an off grid charging station for a Chevy Volt. I decided
to stick with the onboard 120 VAC charger, as the slower charge rates
are more efficient for both the house and vehicle batteries. Its the
old Puekert's # issue: the faster the charge or discharge rate, the
http://nationalcarcharging.com/downloads/
has several models of 240 vac chargers with full spec sheets. I just
met them at a trade show.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified, Licensed Contractor
808 269-7491
On 2/22/2013 5:29 PM, William Miller wrote:
Friends:
I would not both
HI Jeremy, Bob;
That's the little strap that would slice you open if you weren't
careful. That's a very hard box to work in just with one inverter. My
recommendation would be to switch that box out for dual inverters. Use
Outback's Flex 500, or Midnite's Notagutter. You're trying to save t
I never recommend trying to fully charge with a generator anyway: its
too fuel inefficient. A good 4 hour bulk charge from 50% back to 80%
SOC, and then hope the sun shines again. I usually set the voltage on
the high side (they usually run the it in the winter), and program the
run time to 4
HI Chris;
Just to be clear, the cables are not going to fail just because they
aren't code compliant; unless you meant they would fail an inspection.
I've included a picture of my own service rated at 150 amps. Using
table 310.15(B)7 (which I believe is the correct table for sizing the
serv
Hi Guys;
I have a project that will need multiple small battery based inverters.
Each one will only be running a 100 w max. computer power supply, so
there are no significant surges, and modsine will be fine (most small
UPS systems only put out modsine) Avg load will be 20 watts.
I know the
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified, Licensed Contractor
808 269-7491
On 3/13/2013 10:27 AM, Dan Fink wrote:
Ray;
Keep in mind that with truck stop inverters, everything *must* be
plugged into the front 120vac outlets on the inverter. You can use a
power strip, but can NOT run
e and of course many of the Morningstar units.
Thank you,
Maverick
Maverick Brown
BSEET, NABCEP Certified Solar PV Installer ®
President & CEO
Maverick Solar Enterprises, Inc.
Office: 512-919-4493
Cell:512-460-9825
Sent from my HondaJet!
On Mar 13, 2013, at 11:01 AM, Ray Walter
That looks great Eric; thanks for
sharing. For this particular market (under 1000 watt inverter)
UL/ ETL listing is just not an issue. As soon as we're going for
a full on code compliant house system, complete with Finicky AHJ,
we're looking at Magnum or Outback
Very interesting, as I'm going out on my first metal shingle roof
tomorrow morning. We were going to use a regular Soladeck. I'll let
you know how it goes. I'm thinking I can trim it with a tin
snips(famous last words?)
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Lic
How is this roof type for flashing? Do you just cut it with a tin
snips? My project only entails replacing an unflashed conduit
penetration with a Soladeck, so I'm hoping it won't be too bad.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Des
Szumlanski <mailto:ja...@fafcosolar.com>> wrote:
Tin snips does the trick. I have a guy with 20+ years of roof
experience that's a craftsman with snips. It's easy to butcher it if
you let a junior guy do it.
*Jason Szumlanski*//
/Fafco Solar/
On Thu, Mar 21, 2013 at 11
Hear, Hear, Carl.
That has also always been my experience as well. In my off grid work,
reliability trumps budget, and I almost always over size charge
controllers, relays, inverters, fuse holders, etc. Most failures seem
to be related to pushing the design limits of the equipment.
I spent t
Also, Windy Dankoff's old spread sheet that I adapted calculates
generator run time per week, and Maui SOlar software does a good job of
calculating generator hours per year. I've used Homer and found it to
be pretty far off from off grid reality.
Any off grid application is going to benefit fr
I've never seen battery connections come loose with thermal activity, as
long as they had a regular split lock washer on. I've gone back on our
own work that is over 13 years old, and all is still tight. As Allan
noted, I have seen plenty of failures due to untightened, and improperly
crimped
I just finished a rewire and we kept the Ananda power center, Allan :-)
Back when we used class T fuses more they were always over sized
relative to Heinemann breakers.
400 amp class T fuse = 250 amp breaker= 4/0 cable
200 amp class T fuse = 175 amp breaker= 2/0 cable
I still think class T fuse
he
industry progresses towards other battery chemistries, we will see more
integrated OCPDs that are only found on kid's toys today.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 4/6/2013 8:29 AM, Phil Underc
Fellow Wrenches;
I am consulting on a larger project out of country, and the utility is
(as usual) concerned with disturbances to the grid from the variations
in solar output. I know that most of the latest utility scale inverters
have some ability to control the rate that power ramps up and
or battery systems
with multiple strings of batteries. 2011 NEC 240.21(H) allows
overcurrent protection to be installed as close as practical to
battery terminals - even in classified locations.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 4/6/2013 7:29 AM, Phil Undercuf
Chris Freitas is my hero; that was true wrenching, even better that his
mad scientist's experiment is still relevant 20 years later. Here's a
link to the full article I stumbled on to last night:
http://www.ibiblio.org/london/alternative-energy/homepower-magazine/archives/27/27p26.txt
Very co
Hey Bob;
Can you share that AIC vs Voltage chart?
Thanks,
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 4/9/2013 1:46 PM, boB wrote:
Those 250 amp and 175 amp breakers we have used for many many years now
hav
Hi August;
250.162(A) says "operating at greater than 50 v", which a 48 v nominal
system operates most of the time at over 50 v, at least when solar
charging and/or selling back.
We used to get dinged many years ago for using breakers rated at 50v dc
on 48 v systems. John Wiles used to insist
Hi Drake;
Read down a bit more and 250.166(C) and (D) limit the size of the GEC to
#4 or #6 max., depending on what electrode is used.
This used to not be the case, and systems in the 90s had 4/0 cable to a
5/8" electrode: which just like your 1/2" pipe example was absolutely
ridiculous.
R.R
s one of the exceptions.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 4/16/2013 1:06 PM, Garrison Riegel wrote:
Hi Ray and All,
250.166 says the GEC must be sized as specified in (A) Not smaller than the
ne
gh)
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 4/17/2013 7:44 AM, Garrison Riegel wrote:
Hi Ray,
Not saying he was right, but it was explained to me by an inspector that the
pipe electrode mentioned in 2
The old 50uF cap trick worked on Trace SW Inverters as well to run other
Hi Efficiency washers. I thought it was the zero crossing issue, but
what you're showing for PF makes more sense. I knew the caps worked, I
just didn't fully understand why. Thanks, Larry.
R.Ray Walters
CTO, Solarray,
I have to mention that Schletter has not been very responsive to
projects that are less than a MW these days. Nothing worse that
promising a customer something, only to find out you can't even get a
price on it.
Meanwhile an outfit that WILL return your calls and has a good
engineering staff
We've used them before, just check the in-lb ratings of the connectors
you'll use them on. Ours went to 36in-lb, and for more, we just used
our torque wrench. I'm now using powered screw drivers with torque
settings, and then do a final check with the wrench.
http://www.milwaukeetool.com/powe
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