Wrenches,
A client of ours recently had a catastrophic failure of his Whisper 500 turbine
(weld completely failed, turbine destroyed, very ugly) and is in the market for
a replacement.
Any recommendations out there for a good, quality unit in a similar size range
of 3 kW? It is a 48V off-grid
Chris,
You could try System Advisor Model (SAM) from NREL for free:
https://sam.nrel.gov/
Cheers,
-Nathan
--
Nathan J. Stumpff
NABCEP Certified PV Installation Professional #091209-175
NABCEP Certified Solar Heating Installer #032412-14
Project Manager | Arctic Sun, LLC
nat...@arcticsun-llc.com
Hi Eric,
It is 25 inverters on a 20A circuit, but only on 208 three phase. Each micro
connects to the cable in an alternating way (L1/L2, then L2/L3, then L3/L1,
etc.) so with 25 micros there are either 8 or 9 micros on each combination.
9 x 1.0 A x 1.732 (square root of 3) x 1.25 = 19.48 A = 2
Kirk,
We install this standard on basically all of our two tank systems. Small
circulator w/ check valve from domestic tank HOT to solar preheat tank COLD.
The 'makeup' water for that line is the one already installed, preheat HOT to
domestic COLD. It operates on a delta-T control on both tanks
Hi Ross,
Just back from the site and I do have a couple of questions if you don't mind.
- Shock absorber appears in good shape other than the blown out
polyurethane bushing. I can easily find complete replacements for the whole
shock absorber, but haven't found anyone selling just the
Hello wrenches,
We were hired to service a Whisper 500 turbine installed about 3 years ago by
others. It is currently working and producing power.
I have a list of improvements I want to make to the original installation
including work to the foundation and wiring, but was looking for any advic
___
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nathan Stumpff
Sent: Monday, August 05, 2013 2:04 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Dual Radian install
We have installed one dual Radian system. We looked at the
We have installed one dual Radian system. We looked at the prewired
distribution boxes from OutBack (MidNite's wasn't out yet at that time) but
they had no bypass solution for two inverters. We ended up using an external
100 A, 2 pole, double throw safety switch for an AC bypass from the generat
Wrenches,
It looks like the new Fronius Arc-Fault detecting line is available through
distribution (IG Plus Advanced...) Anyone had a chance to try it out? Any
initial impressions?
It makes me a little nervous that it still isn't on their website other than a
short press release and the person
Hello wrenches,
Anyone have any experience with BZ Products charge controllers? Kind of thin
website (http://bzproducts.net/) but it seems like a pretty slick way to be
able to use the ubiquitous 60 cell panels in small systems, if the controllers
are quality.
Any thoughts appreciated.
Thanks
Larry,
I don't think the relationship of AWG size to ampacity is a linear curve, so
while that "rule of thumb" may be pretty good, you can't always count on it. I
would use the circular area column in NEC Chapter 9, Table 8 for an easy, quick
way to compare two of one conductor vs. one of anoth
Wrenches,
This is an offshoot in a way to the Cable Tray discussion, but until there are
Brits running my permit office...
I am considering pitching a 1,000 Vdc system to my AHJ, and it seems like the
solar components (modules, inverters, combiners, array wire) are the easy part
in a lot of wa
Wrenches,
Are there other string inverters currently in production and available with
working AFCI besides SMA? It seems like I would have gotten a hundred emails if
there was, but maybe some company with a little smaller profile?
Nothing against SMA of course, but their relatively narrow opera
Andrew,
QuickMount PV has been amenable to building custom standoffs. They would be
crazy expensive if you only needed a few but for a big job or multiple
projects, they might be an option for you.
Also, for using galvanized rail you may want to check out Cooper B-Line's solar
products. Their
Wrenches,
I am designing a system with a sizable diversion load and am looking for the
smallest water tank I can get with four ports for elements. I will be supplying
my own elements and need four 1" bungs. I am definitely trying to avoid a
large, expensive solar thermal tank, but that is all
Wrenches,
We are working on the design for a system where we will be using grid-tied wind
and solar but will not be able to net-meter the project (we can interconnect
but the meter only runs one way.) Anything we use on site is worth 100%, any
production that goes back to the grid is lost forev
Thermal wrenches,
When plumbing a booster pump in series for a solar drainback system, should the
booster pump go ahead of or behind the main circulator?
Cheers,
-Nathan
--
Nathan J. Stumpff - Arctic Sun, LLC
NABCEP Certified PV Installer #091209-175
NABCEP Certified Solar Heating Installer #03
odssolar.com<http://www.realgoodssolar.com/>
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> 7_solar_myths.php>
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>
>
> From: re-wrenches-boun...@lists.re-wrenches.org
> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Thermal wrenches,
I have a series of upcoming projects involving large (up to 10,000 gallon)
water storage. They are closed (air-tight) but unpressurized (oversized
expansion capability) systems, basically just a mass of water. We move heat in
(solar, masonry heater) and out (DHW, space heating
Wrenches,
I am doing a job for a customer installing a ground mounted array about 250'
from his existing battery bank. Array is:
- Vmp: 87.9 V
- Imp: 47.1 A
- Classic 150 controller
The customer already owns (hence the choice of the 150 over the 200 or 250
controll
Wrenches,
Is the 'dongle' used to interface a computer with an XW :
A) a proprietary part from Schneider/Xantrex or
B) a standard computer part?
If A, any recommended sources for one? If B, any information on what it is,
what it is called, cheap place to buy one, etc.?
Thanks!
--
Nat
Wrenches,
In a job coming up I have a customer with an existing FM60 controller, 520
watt (!!) array. We are doing a ton of work, including adding a 4 kW solar
array with Classic 150 charge controller. I am trying to figure out how to
handle the GFP.
For the Classic, I need a 90 or 100 A outp
Wrenches,
I don't believe this is a correct use. As was already pointed out, the correct
size fuse for those two paralleled strings (assuming 60 cell, 230 or so watt
module) would likely be 30 A:
Isc = 8.2
82 A * 2 * 1.56 = 25.6 A = 30 A fuse
The max series fuse rating of the module is most li
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