How to properly size conductors based on insulation and termination
temperature ratings is an often discussed topic among PV designers. Those
discussion have provided clarity and understanding of the issue but
determining equipment rating, as opposed to termination rating, is still
unclear. See bel
If you are using micro inverters and terminating them in an AC combiner panel,
does the feed for the AC combiner panel (125A) need to have bonding bushings
for the ground wire? In other words is this ground wire a GEC/Equipment ground
like might be used if running an inverter output to a panel?
Jesse,
Any metallic raceway that has a GEC running through it needs bonding. So,
if you've got the Enphase DC-GEC running through it then, yes, it would
need bonding fittings. At least that's my take on it.
Check out NEC 250.64(E) towards the second half of the paragraph. 2011 NEC
has a nice clar
Wrenches,
We have years of installing 36-cell (12V) and 72-cell (24V) modules
for battery-based customers. Most of our systems are 24V or 48V
nominal. Over the last few years, sources of conventionally-sized
72-cell modules have dried up - as cells have increased in size,
Hi Chris,
Here are my thoughts on your questions/notes below. Please note that I'm in
no way an expert in this field, I've only had to deal with it from time to
time through our workings with various situations and AHJs.
1. I believe terminal and equipment ratings can vary within one pi
Wrenches,
When adding a modern charge controller to an existing off grid
system as part of an array upgrade, we often have to mix charge
controllers and their widely differing control algorithms. A common
combination is to add a new array with a FM60 or Classic to an olde
Hi Allan;
I've been in the same conundrum lately. I found that AEE and others
have 12 v modules (Solartech), but the price per watt is double or
triple. My take is that somewhere around 200 to 400 watts, its more
cost effective to go to the GT modules with an MPPT controller. Blue
Sky make
Hi guys
I've buying the new 6" cell x 72 cell from Trina from a few suppliers.
Big yea, but same 44voc so it's an easy add to existing systems.
A huge relief.
Jay
Peltz power
Sent from my iPhone
On Jan 24, 2013, at 12:11 PM, Ray Walters wrote:
> Hi Allan;
>
> I've been in the same conu
I totally agree - old mods are usually not worth messing with at today's PV
prices. In some cases it might be best to downsize the system and then AC
couple some microinverters to cover the decrease in performance, or just
replace the entire array if there are enough problems. There is a used
marke
Jason,
How do you AC couple some microinverters to cover the decrease in
performance in an off grid system, especially with older
equipment, such as an SW4024?
Thanks, Allan
Allan Sindelar
al...@positiveenergysolar.c
Upgrading to a versatile Midnite or Outback cc seems to me a better investment.
Sometimes you can match newer 72 cells with older mods...For example, one new
Canadian 280 (35.6Vmp, 44.2Voc) matches up nicely with 2 old Kyo 120's
(33.8Vmp, 43Voc)
Eric
SunHarvest
- Original Message -
Suntech 295's... Biggin!
Thats about it!
We did get some 72 cell mods from Oasis Montana (dealer)
We are in the same boat. 14 years of off grid installs!
Jeremy
All Solar
- Original Message -
From: Allan Sindelar
To: RE-wrenches
Sent: Thursday, January 24, 2013 12:35 PM
Sub
Blue Sky Energy just came out with a MPPT controller for 60 cell modules called
the 2512iX-HV. It can handle up to 270 Watts input/60 cells and 340 Watts input
with 36 cell modules.
Larry Crutcher
Starlight Solar Power Systems
On Jan 24, 2013, at 1:15 PM, Jay Peltz wrote:
Hi guys
I've buyi
I'm not sure that AC coupling would work with the old SW inverters.
Assuming they are stacked for 240V, I don't see why it couldn't work. I
would actually like to know because I have dual SW5548's on my farm in the
Caribbean and I am considering adding more PV. Adding PV on the DC side
would be a b
One other thingI have been selling 155 watt PV modules, mono with very low
temp. coefficient of -0.23%/°C, that are 17.5 Vmp and 21.6 Voc. These are very
good performance modules and efficient too. 26.5" x 58.3" and Tyco connectors
attached.
Larry Crutcher
Starlight Solar Power Systems
Blue Sky Energy just came out with a MPPT controller for 60 cell modules called
the 2512iX-HV. It can handle up to 270 Watts input/60 cells and 340 Watts input
with 36 cell modules.
Larry Crutcher
Starlight Solar Power Systems
On Jan 24, 2013, at 1:15 PM, Jay Peltz wrote:
Hi guys
I've buy
Sorry, the 155 Watt modules have MC4's, not Tyco.
Larry
On Jan 24, 2013, at 12:35 PM, Allan Sindelar wrote:
Wrenches,
We have years of installing 36-cell (12V) and 72-cell (24V) modules for
battery-based customers. Most of our systems are 24V or 48V nominal. Over the
last few years, sources
Friends:
Again, welcome to the world of PV design.
I suggest one become accomplished at analyzing IV curves for various PV
strings. I created a spreadsheet that helps me analyze these values. You
can then see if you can mix and match modules to find workable solutions.
I recently was asked
(off list) What brand and model are
they, Larry?
Allan
Allan Sindelar
al...@positiveenergysolar.com
NABCEP Certified Photovoltaic
Installer
NABCEP Certified Technical Sales Professional
Larry,
Yes, but isn't it 12V-only output? When I called Rick Cullen to
ask if he had anything to work with 60-cell modules, he told me
only in 12V output, which we seldom encounter any more.
Thanks,
Allan
Allan Sindela
Chris/August:
1) The terminal temperatures in a piece of equipment should have been
evaluated as part of the Listing process. The manufacturer should specify the
temperature rating of the terminals and the wire temperature and type, e.g.
(Al/Cu). The NRTL will do temperature measuremen
Alan:
You can also use one of our Optimizers with IndOp.
This will buck of boost the module voltage to match the battery voltage.
Still would need some form of charge control to protect the battery but this
would provide an easy way to add new 60 cell modules to an existing 72 cell
array.
Feel f
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 if
he had
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:
True, the 2512iX-HV model is for 12 volt systems only. The 1524iX will operate
with 12 or 24 volt and can handle up to 57Voc. However, in the manual it
recommends no more than 45.6 Voc for 24 volt operation with 33 to 37 volt
modules. I'm guessing the conversion efficiency suffers outside that r
Friends:
If you are accustomed to using an Outback CC and not the Blue Sky, there is
an important difference: The Blue Sky requires that the PV negative
current be routed through the device.
William Miller
Miller Solar
Voice :805-438-5600
email: will...@millersolar.com
http://millersolar.co
HI All,
Is there a rough voltage range ( high/low nominal) for the lithium family of
batteries?
I'm curious if our current range of inverters can work with these batteries, at
least on the load side, probably not on the charging side.
thanks,
jay
peltz power
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