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From: Darryl Thayer
daryl_so...@yahoo.com
To: RE-wrenches
re-wrenches@lists.re-wrenches.org
Sent: Tuesday, March 10, 2009 6:51 PM
Subject: Re: [RE-wrenches] Lightning protection system
Thanks Joel
the Lightning and Transients research Institute has
been closed, I am
sorry
Hello
I use both. I am impressed with the what appers to be rapid improvement with
the Solmetric. Also with the for my experiance better customer service with
solmetric. I like the ability to use NREL TMY-3 with Solmetric, and the effect
of orentation on performance using the web based
Of course, but perhaps it is a generator system with solar assist. Do you have
a kWh/day estimate? When you size and price kWh cost of the generator running
with they will come to their senses. Use Homer (NREL) to give a basis for
energy costing, they have suggested numbers for
One problem you are facing is the apparent state of charge is reflected by
battery terminal voltage is a very inacurate measure. It is of course affected
by rate of charge and discharge.
Another approach would be to use the FN-DC and set it to alarm on state of
charge instead of voltage.
HI I partook in some calculation to real comparasions several years ago. In
general the results from F-Chart software and I think Maui? did a rather good
job. The RetScreen is very limited at present, to bad because it is so easy
and accessable. ( I think Retscreen is taken over by
Hi Mike
I think that NABCEAP is an important part of the solar community, I would vote
for them being allowed. perhaps a limited time access incase there is
problems.
Darryl
--- On Fri, 2/13/09, Michael Welch michael.we...@re-wrenches.org wrote:
From: Michael Welch
Some of the hot surface ignitors I have seen draw a lot of current, in the
order of amps. I would expect the inverter to drop out if it were overloaded
however. Also does the magnum drop voltage at very low loads? Where the
furnace controls can not function due to low voltage or poor wave
HI Jay
Yes, I have done one using the unirack system, top down mounts, the layout
rack-mounting time was excessive, but the final product was acceptable.
Darryl
--- On Sat, 2/7/09, jay peltz j...@asis.com wrote:
From: jay peltz j...@asis.com
Subject: [RE-wrenches] sharp triangle modules
hi
i have seen fast corrosion of copper on galvanized, it also seems as if once
the galvanized is gone the steel underneath rusts very fast. I have had good
stability of galvanized on aluminum (or anodized aluminum.
--- On Mon, 1/26/09, August Goers aug...@luminalt.com wrote:
From:
I think you have a very valid point.
The testing travel distance is a real burden. It appears to me that If a valid
test site, a bonded proctor, and enough candates can be provided, this should
be acceptable. We offered the above last year and was turned down.
Daryl
--- On Thu, 1/15/09,
HI all and Ron
In my previous post I said the inverter FET board, I am wrong, it would have to
be the AC board or the generator is running out of frequency spec.
Place a load on the generator, so it runs in power note idle, use your meter to
measure the generator frequency, set the inverter
It sounds like the AC charge current is set to high, with the batteries being
low the inverter charge rate is overloading the gen set. The gen set voltage
drops and the inverter releases the genny and the voltage returns, the inverter
reloads the genny and the cycle repeats. If this worked
If each string is composed of only one orientation then there would be little
loss. There have been a couple of papers on this at different conferences. I
also think John Berdner wrote a paper on it for SMA. (I think the annual
losses are in the nature of 2 to 5 %) If however a single
Hi Allan I have had this problem. I can name a few installations where it
happens. I think that it is the high ripple current if you have and average of
35 amps but it comes in a current that is 50% ripple, you have a thermal
response of X^2 /2 or about twice the heating. So a thermal
Retscreen has some wind data, and a wind calculator, however it has the same
problem as it has with solar, in that it is difficult to modeling using there
code and you are very limited in applications.
What I would like to see would be a CFD derived emperical model of micro
siting. mode
I assume the old MC is the same as the MC1 and Solarline1?
Also that the tyco, Solarline 2 and MC 4 are also the same?
Plese correct if I am wrong.
Darryl
--- On Tue, 12/16/08, William Miller wrmil...@charter.net wrote:
From: William Miller wrmil...@charter.net
Subject: Re:
HI using my old brain, there is a Tagki or like that makes a larger one. Just
a word of caution, I have had customer complaints on every tankless water
heater I have installed for SDHW, and never a complaint on the solar preheat to
or one tank solar that I have done.
Darryl
--- On Sun,
Hi Joel
HOMER by NREL does just exactly this type calculation, and is not difficult to
use, NREL.GOV
Daryl
--- On Thu, 11/20/08, Joel Davidson [EMAIL PROTECTED] wrote:
From: Joel Davidson [EMAIL PROTECTED]
Subject: [RE-wrenches] PV vs. Genset
To: re-wrenches@lists.re-wrenches.org
Date:
hI ALL
I have not done what you are talking about, but in different setting the
inverter charger would punch holes in the sine wave as the generator ran and
the inverter/charger or even a big battery charger ran. By reducing the
charging rate the size of the holes in the sine wave would
If your fan is less than 1 amp, like a small computer fan, you can power the
fan directly, else you have a problem, because you have 48 volts and need a 48
volt fan or a voltage coverter 48 to 12 volts. Solar converters makes such an
item aloong with others.
Darryl
--- On Fri, 11/7/08, Larry
the contacts in series. Find the
current rating of the Fan and make sure the relay contact rating is greater
than this.
Darryl
--- On Fri, 11/7/08, Darryl Thayer [EMAIL PROTECTED] wrote:
From: Darryl Thayer [EMAIL PROTECTED]
Subject: Re: [RE-wrenches] battery box fan
To: RE-wrenches re-wrenches
HI I should not speak, but, I thought the nozzel had to be sized to the flow to
attain efficiency. So if you have a 4 kW it can not be throtted except by
changing nozzle size or stopping the flow in some nozzles, does this mean you
could use solinoid valves? Also a MPPT controller for Hydro
Hi all
this all seems strange, perhaps the high positive voltage on the front of the
cells causes a build up of charge attracting the negatively charged dust in the
air. Locally we have a DC power line each line either 450,000 volts either
positive or Negative. They reverse the polarity about
Hi all
There are a couple of principals here
1) NEVER NEVER PUT TWO STRINGS OF DIFFERENT ORIENTATION IN SERIES!!
2)The currents are dependent upon irradiance, which varies greatly.
3) The voltage and the Vmp is rather close for varying irradiance, and
therefore if forced non coincident
When this first happened to me I tried to contact the police, and even the FBI
but I found that was a waste of time also. Also beware of fake casheers checks.
Darryl
--- On Thu, 9/11/08, Todd Cory [EMAIL PROTECTED] wrote:
From: Todd Cory [EMAIL PROTECTED]
Subject: Re: [RE-wrenches] Fake
HI all I am forwarding R. Eaton's (NABCEP exc director) response to earilier
post
Hello, thank you for inviting me into the conversation about the eligibility
criteria for taking NABCEP's Solar PV Exam. There seems to be some
misinformation floating around and I am writing to clarify NABCEP’s
jus to add my two cents worth, in Minnesota, all well water is at saturation
with Calicum Carbonate, and some at saturation with FeO? some wells have red
rust such that the water comes from the tap red. I thought all wells were like
that. When softened Calcium Carbonate ion exchanges to Na
I find the Outback FNDC has the ability to track the state of charge using net
energy into the battery and net energy out. Therefore one can use the SOC
directly to start generator and charge batteries and not relay on battery
voltage. I have not used the Apollo for this purpose but believe
Hi peter
Very interesting question and perhaps the fellow from excel tech could help.
First the current limits from an inverter is for total current, both reactive
and in phase. But the starting and running currents for motors are from both
reactive and in phase current. Is the reactive
Here is a far out idea. Why not try to work with Li-ion from a battery tool.
Such as a Ryobi LI-Ion battery, 18 volts, I would guess from performance they
start new at 5 AH and 18 volts. The step down can come from AM or Solar
Converters or one of the other step down converter people.
Hi Max
AC surge
I would never put that large an AC on that small a system. The inverter surge
must be considered, and the 104 amps surge from the AC does sound real. I
think you are correct, the soft Start is no more than an extra capascitor.
(I approximate the AC at 1kW/ton so the running
Hi Jay
I have not had experience with the sunny boy island. but I have had with the
Outback.
In my case I would go with outback. The capability of the FNDC would make my
decision. I have done a five inverter stand alone 6 yr ago (maybe seven), and
it is still working fine. Same batteries.
I have heard the 6kW imbalance rule. However when I spoke with the area
Engineer from the Utility, he said he would not be at all concerned with 10%
imbalance. in fact unless I was to exceed 20% not to worry. The system was a
800 amp 480 volt. He of course said my concern is more where I
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