John,
Could you clarify units? "0.418 Liters/AH" is that per charge cycle?
per hour? per minute? per cell?
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 1/5/2012 4:18 PM, John DeBo
Wrenches,
While looking for information regarding standards about battery room
ventilation I ran into this link, which has some good information and is
certainly worth everyone's attention.
http://www.belvoir.army.mil/safety/inc/battery-explosion.asp
Kent Osterberg
Blue Mountain Solar
ones
are air cooled.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 1/9/2012 7:59 PM, Allan Sindelar wrote:
Wrenches:
We have cautiously agreed to take on a substantial upgrade and
rehabilitation of a poorly designed 48V off-grid system. Our upgrade
rtly because it is
intended to to cover all batteries and it is intentionally conservative.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 1/6/2012 5:53 PM, John DeBoever wrote:
Wrenches,
Thank you for your patience (as I was busy all day). I apprec
100-amp 24-volt charge puts about 25 amps (if you are
careful with the wiring and the batteries aren't sulfated) into each
string of batteries. A 50-amp 48-volt charger would accomplish the same
thing.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On
the charge rate (C/X) that the batteries see is the same either way.
Considering that lots of parallel strings of batteries is trouble
waiting to happen and that a 48-volt system is more efficient, except
for the smallest systems 48-volts is usually the way to go.
Kent Osterberg
Blue Mountain Solar
the charge rate (C/X) that the batteries see is the same either way.
Considering that lots of parallel strings of batteries is trouble
waiting to happen and that a 48-volt system is more efficient, except
for the smallest systems 48-volts is usually the way to go.
Kent Osterberg
Blue Mountain Solar
-volt cells removed.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 1/17/2012 11:19 AM, Mark Frye wrote:
Interesting.
I can choose an OB VFX3524 w/ 85 ADC or an OB VFX3648 w/ 45 ADC of charging
capacity.
And assuming that I need C/10 during bulk charging
the requirements. If the customer owns the production meter, then the
utility company should have no say about it.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 1/24/2012 6:52 AM, mac Lewis wrote:
Here in Xcel territory in Colorado, we are required to cold-sequence
Mark,
I haven't installed enough to speak to any reliability issues with the
M215. But one thing I can say is that I like the new cabling system. The
wire hangers make for a quick and clean looking cable installation.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t
ow if these devices alarm before there is an explosive
concentration of hydrogen? Sounds like recommending them for that
purpose is risky.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 2/3/2012 8:23 AM, john wrote:
Rich,
I have found that having the CO detector anyw
Larry,
It sounds like the customer can power all loads with the generator and
the non-critical load may even be the motivation for starting the
generator? How about a relay that opens the SunnyBoy output or the Sunny
Island input when the generator runs?
Kent Osterberg
Blue Mountain Solar
Mac,
It probably doesn't pass the low cost hurdle, but this sounds like the
perfect situation for a Dankoff Suncentric pump.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 2/24/2012 7:49 AM, mac Lewis wrote:
Hi wrenches,
I am looking for a relat
necessary to equalize the battery until there is enough room for the
replacement acid. Fortunately, it doesn't have to be done in one step.
Since there was acid between the inner and outer case originally, I'd
inspect carefully to make sure it is not filled with acid again.
Kent Ost
boB,
Most local codes, have granted a delay on implementing arc fault
protection. Also, the code only requires series faults to be cleared.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 3/11/2012 8:28 PM, b...@midnitesolar.com wrote:
On 3/11/2012 7
le to
fracture from any minor stress. The glass will usually have larger
fragments in that area and finer fragments farther away.
A shorted diode should be warranty issue.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 3/13/2012 12:21 PM, benn kilburn wrote:
Wrenches,
I rec
I agree, Brian; especially when the battery system is large. It's
important to design the room so it can be in compliance with NEC 480.9.
(A) Ventilation, (B) Guarding live parts. The locked door qualifies, and
(C) Working space.
Kent Osterberg
Blue Mountain Solar
Considering that wood trays are mentioned in NEC 480.8(B), it would be
unreasonable to exclude wood.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 3/22/2012 5:24 PM, allso...@scswifi.net wrote:
He stated "We cannot have any combustible materials&
e off list.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
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yone familiar with a
low-voltage high-current Solarex module.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
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Nathan,
There are no jumpers, each j-box has a single terminal. It has 4" square
multi-crystalline cells, a 2" bronze colored frame, and measures 17.5" x
42"; just a little smaller than a MSX-60.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
O
Allan,
Your right about the modules from Carrizo being made by Arco. And
weren't they mono-crystalline? Three of these modules in series would be
30 cells and not enough voltage for charging a 12-volt battery. But I
think that's the biggest similarity to a Quad-Lam.
Kent Oste
tion plans.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 3/24/2012 10:29 AM, William Miller wrote:
Daryl:
Thanks for the photos and description of the mounts you are
installing. We have installed many of the DPW ground mount systems in
similar configurati
Many inland areas in California, Oregon, and Washington are 85 mph
zones. I think that's the lowest requirement anywhere in the U.S. I
can't imagine designing for 185 mph winds.
Doesn't that just blow the glass out of the modules?
Kent Osterberg
Blue Moun
It is interesting that when you download the manual for the Sunforce
400, you get a 2002 vintage SWWP Air-X manual.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 4/3/2012 5:24 PM, Dan Fink wrote:
Esteemed Wrenches;
I've been watching this thread closely, an
s than the latitude. This
solution produces much less energy the maximum possible. And, of course,
ignoring the value of the land or roof space isn't practical either.
Ultimately, you have to look at what limits apply to the problem and
work from there.
Kent Osterberg
Blue Moun
than on the charge controller
output anyway. Midnite's instructions show the GFP on the charge
controller input, but their 80-amp GFP is a single.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 4/17/2012 11:08 AM, Nathan Stumpff wrote:
Wrenches,
In a job coming up
r the charge controller. Except the the label and instructions
the GFP and the GFDI are identical. In case you don't remember, the PSDC
came with a schematic showing all possible options attached to the back
of the front panel. When it comes time to troubleshoot sometime in the
future,
lly a preventable circumstance: the GFP simply
needs to open both PV+ and PV-. The manufacturers need to step up and
correct this. The NEC needs to be changed to require it. This won't
reduce the risks at the PV array, but it is certainly worth it to design
components that don't but hom
ation of 110.3(B). I find the present situation very disturbing.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 4/18/2012 8:28 PM, Philip wrote:
Hi Kent,
I wanted to add a little more re positive grounding. OutBack's
communication structure, like
I've got off-grid customers where both the husband and wife use oxygen
at night. Because of energy supply limitations they use a liquid O2
system. But that may not be practical for a weekend use cabin.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 4/21/2012 12:
local codes specifying otherwise, MC cable should be allowed. Even that
is overkill for a small 12-volt module.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/3/2012 9:34 AM, Jason Szumlanski wrote:
I'd like some help with code references for an inspector th
re not
appropriate. Keep a copy of how you left the the system programmed in
case there are ever any questions or need to reprogram it again later.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/15/2012 1:44 PM, Glenn Burt wrote:
Hello wrenches,
I am quoting a job t
er is designed to boost the current when the voltage (and
resistance) are less than optimum, so I think it would improve the power
transfer.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/19/2012 12:35 PM, Mick Abraham wrote:
Hi, Wrenchies~
Kindly educate me regardi
Steve,
It would be appropriate for the GFDI to have 80-amp rated contacts that
do not have an over-current trip mechanism. IMHO, the fact that they can
trip on over-current and unnecessarily interrupt the dc system bond is a
serious design flaw.
Kent Osterberg
Blue Mountain Solar, Inc
It is safe to return to the list now. The rant is over.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/23/2012 12:18 PM, Steve Higgins wrote:
From what I understand, future controllers from Outback Power will
incorporate the Ground Fault detection into the co
plates.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 6/1/2012 1:28 PM, Allan Sindelar wrote:
Wrenches,
A long-time off grid client has a 48V Outback VFX system, with 1,680
watts of PV and two strings (16 batteries total) of Deka L16s,
installed last October
ng as the ME-RC remote is
connected)." So, if the default settings aren't adequate, your
customer's will need a remote. They need it to equalize the batteries
anyway. And since every battery system should have a battery monitor,
there may as well be a remote for the purpose of using th
ckfed with micro-inverters. A few small loads
on this panel just lowers the current on the bus bars. The risk that the
120% rule is supposed to address is the possibility of overloading the
bus bars. In the case of the ac combiner that could happen if someone
were to add some very large loads to
ompatibility
problems for various technologies.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
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otherwise it'll be terminating the charge too soon.
Realistically, you may as well disable the end amps feature.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 7/7/2012 2:53 PM, Mick Abraham wrote:
Greetings, All~
My client's string of SunXtender two volt A
l just have
to live with the lost production time. Until Enphase comes up with a
fix, I won't install any more Enphase inverters.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
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sending data. Never-the-less, it's actually easy to make a
reliable frequency measurement by shifting the measurement threshold off
zero far enough that the TWACS signal doesn't interfere. The Enpase
folks should be able to do that with a firmware change.
Kent Osterberg
Blue Mountain
in the utility meter so it's going to both
the customer and the substation. Also, the TWACS signal can be adjusted
if necessary to generate a bigger signal. I guess that would be their
first step in handling a site with a large capacitive load.
Kent Osterberg
Blue Mountain Solar, Inc.
www.b
ssing, for about 8 or 10
seconds, while data are sent. I managed to capture the event with a
scope and the waveform distortion is probably well less than 2% and much
less than the distortion inverters are to allowed cause.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 54
Fellow wrenches,
If anyone happens to have a Mitsubishi MF170 that is available, please
contact me off list. I need one to add to a customer's small system.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568
mable, the same meter can be used to
record net energy - behave like most disk-type meters; ignore energy in
one direction - behave like a detented meter; or record both incoming
energy and outgoing energy separately - a two register meter.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemounta
Jesse,
Sometimes the best thing you can do for a customer is document, in
writing, what's wrong. And walk away if they aren't willing to fix it.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 8/24/2012 6:36 PM, Jesse Dahl wrote:
Im with you on the wisdom o
wire loop.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 9/7/2012 7:40 AM, Jeff Irish wrote:
A customer of ours has recently suffered lightning damage to 31 out of
160 top of pole mounted modules. This is the first time in 10 years
that I've se
induced voltages.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 9/7/2012 11:14 AM, Jeff Irish wrote:
Kent,
Surge protection is at the inverters, 200 feet away, on both the AC
and DC sides. Nothing at the array; never thought we'd need it
See 690.13. There must be a means to
disconnect all conductors of a PV system. If it is a normally
grounded array you are not allowed to put a switch in the grounded
conductor, except for circumstances added in the 2011 code.
Kent Osterberg
Blue Mountain
ray, which will probably become more common as
equipment is designed to operate that way, both conductors are
supposed to be switched in the disconnect. In that case there
shouldn't be any white wire going to the PV array.
Kent Osterberg
Blue
data.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 10/8/2012 9:34 AM, Jeff Wongstrom wrote:
Hello wrenches,
We have a Fronius IG3000 that chronically and frequently
cycles into and out of a state 104(grid freq
blems with the time sync signal, I'd guess that the
installation must be close to the substation where the signal originates.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 10/9/2012 9:20 AM, Jeff Wongstrom wrote:
Kent,
I just talked with Mike in the m
And what about the SQ D QO or HOM 6-12L100 or 8-16L100 panels that can
be fed with main lugs that are on opposite ends (left for L1 and right
for L2)? Seems like you shouldn't apply the 120% rule to these either.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 1
Does anyone happen to have one or two AstroPower AP1206 120-watt modules
that they can part with? If you do, please contact me off list. Thanks.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
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d. Don't expect everyone to accept this practice. You might need a
j-box in the attic to change wire type to NMC cable or THWN wire.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 11/1/2012 5:07 AM, Chris Mason wrote:
I remember from a project we were doing that requi
osure-types.pdf
<http://www.nema.org/Products/Documents/nema-enclosure-types.pdf>
From NEMA's definitions there is little difference between a type 4 box
and 3R box. But the seal on a type 4 box prevents the entry of blowing
snow while a 3R box doesn't.
--
Kent Osterberg
Blu
There is no need for an exception. Even in the 2008 NEC, 690.31(E) is
clearly about the dc wiring. The proposed informational note adds
nothing except to explain that ac isn't dc.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 11/3/2012 11:09 AM, Dan Fink
Article 100 has a definition for service. It doesn't seem like a PV
system or a battery based inverter for off-grid fit the definition.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 11/8/2012 8:22 PM, Nick Vida wrote:
Hi Wrenches,
Thanks for you comments. Fun fo
My understanding has been that the Soladeck has only been listed for DC
wiring. Perhaps they have a manufacturer rep on RE-wrenches that can
clarify.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 11/25/2012 6:20 AM, Dave Palumbo wrote:
Rich,
We have been using
rated to provide 63 amps continuously. Most 200-amp service panels don't
really have 200 amps available except for short durations.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 12/12/2012 4:43 AM, Jason Szumlanski wrote:
See 690.10, 690.1, and 690.3
r MPPT tracking, over the Midnite Classic or Morningstar TriStar MPPT
charge controllers.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 12/16/2012 10:51 AM, Kirpal Khalsa wrote:
Allan...indeed this is a limitationand yes i agree with you that a
higher voltage charge c
If you are using the 2011 NEC, 705.12(D)(2) has an exception to the 120%
rule for inverters with energy storage to allow for operation of loads.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 12/30/2012 4:27 PM, Jeremy Rodriguez- All Solar Inc. wrote
transmits data via 433 MHz radio instead of power line carrier. Noisy
inverters don't seem to bother it. Efergy meters are ETL listed, and are
considerably cheaper than TED.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 1/16/2013 2:07 PM, Kirk He
grees before the zero crossing. Supposedly,
they increase the firing angle to get a stronger signal from sites
that are hard to reach.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 2/7/2013 2:13 PM, Nick Soleil wrote:
roof should be permitted. There should also be an accessible disconnect
elsewhere (at the panel feeding the combiner for instance.) That (may)
makes the breakers in the ac combiner supplementary and thus they
wouldn't have to be accessible.
Kent Osterberg
Blue Mountain Solar
I've got a customer that has outside lights that are only on when the
generator runs. Also has a siren/strobe light alarm that comes on when
the batteries are below the 2-minute threshold for the generator start.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 54
rging batteries in renewable energy systems. Considering the
market for these, the normal unit is probably set up to provide a float
charge voltage.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 3/5/2013 7:17 AM, jay peltz wrote:
HI All,
I know many of you like
wall wart power supply would
operate it.
About $150 at Mouser.com
<http://www.mouser.com/Search/Refine.aspx?Keyword=G9EB>
You shouldn't have to switch at 600 volts. It should work just as well
to short the lowest voltage pair of modules.
Kent Osterberg
Blue Mountain Solar, Inc.
w
ommon wall wart power supply would
operate it.
About $150 at Mouser.com
<http://www.mouser.com/Search/Refine.aspx?Keyword=G9EB>
You shouldn't have to switch at 600 volts. It should work just as well
to short the lowest voltage pair of modules.
Kent Osterberg
Blue Mountain Solar, Inc.
w
How about this unit from Tyco that is rated 100 amps at 900 volts:
http://www.te.com/catalog/pn/en/9-1618389-8?RQPN=LEV100A5ANG
and only $110 at Mouser
<http://www.mouser.com/ProductDetail/TE-Connectivity/LEV100A5ANG/?qs=%2fha2pyFadug1f8yBSHppXCbQVN7JiNYp4qGSI0ewLzHnRcQBcz6gcA%3d%3d>.
y that
would be different for a utility scale system where clouds could reduce
the output of an entire plant in a few short amount of time. The
article may have been in /Solar Today/, /Solar Industry/ or /Sun & Wind
Energy/, unfortunately I can't find it now so maybe it was somepla
le 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 Undercuffler wrote:
Ray,
690 d
Dave,
The problem occurs when the kWh meter sends data. I would expect any
neighbors' meters on the same transformer to cause trouble. And probably
neighbors that are not on the same transformer too.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On
Enphase lists the standard operating range for the 208-volt 3-phase
configuration as 183 to 229 volts. Seems like 220-volt 3-phase might
work with a little caution about wiring losses.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 4/15/2013 4:28 PM, Larry Crutcher
The problem they'll have with a completely flat module is that rain
won't wash the dust off.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 4/20/2013 10:09 PM, Benn Kilburn - DayStar Renewable Energy wrote:
Carl,
I realized mis-read/answered your question. I
onths
ago, I was asked to participate in a survey regarding Xantrex products
and service. My responses must have got someone's attention because I
got a follow-up call about the survey. There never has been a follow-up
to correct this customer's problem inverter.
Kent Osterberg
Blue
Has any put together an ac-coupled system using the Xantrex ProSine
inverter? I've got a customer that wants to try this and I don't even
know if it is possible to do with the ProSine. I'd rather not be the
first to give it a try.
--
Kent Osterberg
Blue Moun
Thank you, David. I knew someone monitoring this list would know if it
would work.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/13/2013 4:06 PM, David Katz wrote:
Hi Kent,
It will blow up. The Prosine is not bi-directional. You can only use an
H-Bridge type
nergy
production with the 135° azimuth, the optimum tilt angle is about 60°
and that gives 12% more energy in December than the 35° tilt would
(without considering how much better the steep tilt does at shedding
snow). The SE roof with the steeper pitch is certainly the better choice.
Kent Oste
d to fail before the site met Enphase's criteria
for replacement? I'd like to get an idea of how long I'll be in this mess.
--
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
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fine.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/18/2013 3:26 PM, Jason Szumlanski wrote:
Is there any reason I can't do this? I have an existing string of 3
M190's and want to add 7 M215's. I plan to tie into the same j-box,
which has #10 going to a fusi
Thanks for your input, Carl. That data looks pretty grim. This is a
serious black eye for our industry.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/20/2013 12:36 PM, Carl Adams wrote:
Ken,
We installed our first Enphase units in Dec 2009, and our *last*
Enphase
Jesse,
The controller is supposed to limit the output current to 80 amps. But
the 80-amp GFDI breakers will trip anyway.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
On 5/28/2013 9:01 PM, Jesse Dahl wrote:
When I was looking at the Outback Flexone setup today during
utility on the bus bars? Or do you have one point of interconnection at
the line side of the 200-amp breaker? I think it is really the second
and I think that is what the electrical contractor was thinking. You may
need to label the panel to make it clear that it isn't for loads.
Ken
Generally a system bonding conductor must be as large as the GEC, 8 AWG
minimum. Inverter manufacturer's often have a smaller conductor make
the system bond through the inverter's GFP. For factory assembled and
listed products, the small conductor is obviously accepted by a
testing/listing la
likely to send an emergency
responder on a wild goose chase.
Kent Osterberg
Blue Mountain Solar
Phil Schneider wrote:
Wrenches,
Our utilities require an external AC disconnect between the inverter and the
point of interconnection, located next to the meter. In the past, we have
marked this switc
Peter,
Many general duty safety switches, such as the Siemens GNF321R, are
rated for 250 volts dc. They usually require the use of two switch poles.
Kent Osterberg
Blue Mountain Solar
Peter Parrish wrote:
Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820
Almost right Christopher. NEC 705.12(2) allows the ratings of the
overcurrent devices supplying power to the bus bar to be 120% of the
busbar rating. For a 225-amp busbar that amounts to 270 amps. So a
200-amp main breaker and a 70-amp back fed breaker from the solar
system. Or a 225-amp ma
Fastenal has stainless ties is various lengths
http://www.fastenal.com/web/products/detail.ex?sku=0710242
For those that haven't used these before, beware that it is difficult to
tighten them.
Kent Osterberg
Blue Mountain Solar
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Mark,
Any chance that the relay controlling the generator is in a FlexNet DC?
I've had a least one customer's generator not shut down and was pretty
sure that it was the latching relay in the FlexNet DC that was the culprit.
Kent Osterberg
Blue Mountain Solar
Mark Dickson w
Larry,
I've found the Contico Pro Tuff Bin (Lowes part number 91573 - $65, or
Grainger part number 1DZE8 - $70) to work well for holding four L-16
batteries.
Kent Osterberg
Blue Mountain Solar
www.bluemountainsolar.com
Starlight Solar, Yuma, AZ wrote:
Greetings Wrenches,
I need to f
Larry,
Here's another battery enclosure we've used:
http://www.radiantsolartech.com/batteryboxes.html
These items are also available from AEE Solar.
Kent Osterberg
Blue Mountain Solar
www.bluemountainsolar.com
Starlight Solar, Yuma, AZ wrote:
Greetings Wrenches,
I need to find a s
.
When you are only getting 3-amps into a 400-amphour battery, the solar
system contribution is negligible anyway. None-the-less, poor
performance is not expected from first rate gear.
Kent Osterberg
Blue Mountain Solar
William Miller wrote:
Friends:
We have been noticing that when equa
other charging sources, a
solar vent fan wouldn't be adequate.
Kent Osterberg
Blue Mountain Solar
Allan Sindelar wrote:
We have twice used pairs of Zephyr Power Vents to successfully vent large
banks, up to around 2200A/hr @48V. A 12V unit exits roof or wall with a 2"
pvc stack;
ting for the
battery room, we provided positive pressure to the room with the vent
fan outside the room. This avoided the issue of using a vent fan rated
for explosive environments. The ceiling vent is completely passive.
Kent Osterberg
Blue Mountain Solar
Dana wrote:
Kent
–
temperature, maybe around -10%, should be included too.
It looks like Cotek recommends a minimum cable size of 1/0, so out of
fear of starving the inverter of enough voltage, I wouldn't use any smaller.
Kent Osterberg
Blue Mountain Solar
On 8/11/2020 3:18 PM, peter...@pobox.com wrote:
I have
ency noise.
Kent Osterberg
Blue Mountain Solar
On 8/15/2020 8:06 AM, Matt Sherald wrote:
Hello All,
My curiosity was piqued by a recent customer complaint. I'm hoping
someone has bumped up against this issue before.
The customer has a OB FXR2812 and a 3,000W Honda gen.
Her gas clothes
el. Pretty sure vent pipes under the array are not a good idea for
many of us.
Kent Osterberg
Blue Mountain Solar
70177 Ponderosa Ln.
Cove, OR 97824
www.bluemountainsolar.com
On 8/31/2020 6:40 AM, Matt Partymiller wrote:
Scot,
What do you interpret the last part of that section to
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