The SMUD paper on testing from the MicroPlanet site says the following, but
I couldn't find other reference to the PV inverter in a quick read:
"In 2004 SMUD ran a series of tests on MicroPlanet Ltd.’s High Voltage
Regulator (HVR) at its
photovoltaic test laboratory at Rancho Seco. Using a dedicat
Hello Lee,
Walt here.
I will be leaving for Haiti in about a week, and be there for three….
We have done lots of schools. If you are strictly 12V, your choices primarily
are 12V CF and LED lights. There are lots of pros and cons to both.
The real question is what you intend to us
Peter,
The excursion time depends on how high the excursion is. There is a longer
grace period for being just above or below the limits to allow for inverters
to ride through normal transients. However, beyond that are some very short
timeframes for excessive transients and large excursions. There
Lee,
Consider 3W LED floodlight fixtures. Talk with Doug Atkins of Quad Energy,
713-992-2884, dou...@yahoo.com. His LED wide-angle floodlights are sold
through Real Goods and directly to dealers as well. He sent me one and it is
well made and reasonably priced. The low draw of the LEDs allow you t
IEEE1547 totally changed the way the utility
protective functions are specified.
For line voltage, the old UL1741 and IEEE1547 have the same table but
the requirement is different.
Here is the table:
Under 1741, the inverter had to trip off at less than the stated
voltage (for the high t
Can anyone recommend lights for a school in Haiti. I am going there in a
couple of months to install a 12 volt solar PV system and need to illuminate
seven 16 x 20 foot school rooms. I am so confused by all of the light bulb
options, base options, CFL vs LED, what wattage is required, etc. I wou
Hi Travis, Apology accepted with relief :-) I'm a happy camper.
If I need something (product brochure, manual etc) I take a trip into town to
an internet cafe with my laptop. Usually the speed there is not great (depends
on the number of users at any time) but it is the only practical option.
t. Seems to me, we have to have a peak
reading voltmeter or something equivalent.
Absolutely. Been there before on a Sunny Boy system with high line voltage.
Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM Certified PV Installer
Office - 740-448-7328
Mobile - 74
I've run into this issue as well. I always keep the inverters as close
to the main service panel as possible to minimize voltage problems on
the AC side. The vast majority of AC voltage problems I have are when
the inverters are far away from the house, and even though the wire
might be oversized
Peter,
Yes, grid impedance is another variable, and one that we can not easily
control. The impedance looking into the grid can be high due to loose
connections or undersized conductors or both. In some cases we've had
to have the utility out to check their pole top and meter connections.
>From
One thing I have read during this thread, is the voltage rise at the
inverter output required to "sell to the grid". I have heard all sorts of
numbers from "less than a volt RMS" to "2-3 volts". As an engineer, I would
expect the number to depend on the AC current being exported and the
impedance o
All,
If you are looking for voltage regulators that can be placed on a home or
business, check out www.microplanet.com. They are selling these around the
world for energy efficiency purposes. Bring high voltage down makes
equipment run more efficiently and keeps the PV system from tripping. I'm
no
William and others,
The standard requirement in IEEE929 and IEEE1547 that is tested in UL1741 is
+10%/-12%. Admittedly, some utilities, particularly in more rural areas, may
get close to these limits at times. Just for a little history lesson that
very few people know about, this happens to be a v
Just spoke with Satcon and they are grid tie and 3 Phase only
Dana Orzel
Great Solar Works, Inc
www.solarwork.com
E - d...@solarwork.com
V - 970.626.5253
F - 970.626.4140
C - 970.209.4076
“I'd put my money on solar energy… I hope we don't have to wait 'til oil and
coal run out before we tackle t
Correction: 4 KV
- Original Message -
From: "Joel Davidson"
To: "RE-wrenches"
Sent: Sunday, August 16, 2009 12:08 PM
Subject: Re: [RE-wrenches] utility line voltage issues
Hello William,
SCE has some 4kVA long, skinny feeders that get voltage sag during high
usage periods (August
I have a customer near the end of the line, and they have large voltage
problems. They have an outback system, and when the voltage drops the inverter
drops the grid and picks up the critical circuits. I saw this as a real
problem where once or twice a day the system would run on battery and s
Pretty close Allan, but mountains, sheep and mountains!
Cheers,
Bruce
- Original Message -
From: Allan Sindelar
To: 'RE-wrenches'
Sent: Monday, August 17, 2009 3:09 PM
Subject: Re: [RE-wrenches] Seasonal Adjusters
Yeah, Travis, there are "excuses", dude. In the current iss
Please accept my apology not being aware of your unique situation and
realize that my tone was based on what I interpreted on an unnecessarily
less the friendly tone towards the poster of the pictures.
On a side note, I imagine the wrenches list is the least of your internet
problems. How in t
Thanks for the tip William. I am using MS Windows Mail on Vista and I can not
see any option for that action in the setups. Maybe it is hidden somewhere.
I am investigating another satellite BB option that has recently come available
but until they come out to check I don't know if it is going
I am not going to get personal but sometimes people in the USA forget there is
the rest of teh world out there and it is not as well serviced as their own
patch. Just to paint the picture, I live in a valley with a mountain blocking
access to the only satellite currently available for broadband
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