This should not be troubling at all. It is very
straight forward.
Because there is only one module per inverter, and the conductors are
sized for all possible overcurrent conditions, no further consideration
is necessary for the DC side of the circuit.
For the ac side, section 690.8(A)(3) ap
The CEC max power tests require continuous output
power monitoring for 180 minutes. At the end of the test, the CEC
published power rating of the inverter is the manufacturer's stated max
power OR the lowest power measured during the CEC test, whichever is
lower. So, most manufacturers set th
The "Maximum Output Power" listed on the M190 spec sheet is 190 watts.
Upon observing output exceeding 190 watts, we questioned Enphase tech
support and were told that the "actual" max output is 199 watts.
Similarly, the actual max output for the M210 is reported to be 219
watts, although the
Do the Enphase inverters clip the output power to their rating like other
manufacturer's? So a M190 can only put out 190 watts max? I have had this
question for a bit now on system performances using Enphase in designs
during our cold spring and fall days.
Sincerely,
Chris Worcester
Solar Win
Hi wrenches;
I have a client in need of one Sharp 185W NT-S5E1U which was smashed by a
rock, possibly vandalism.
Please contact me off list if you have one on the back shelf! Thanks in
advance.
Sincerely,
Chris Worcester
Solar Wind Works
NABCEP Certified PV Installer
Phone: 530-582-4503
Fa
The over-reporting of energy that Randy refers to below was much higher
than any discrepancy based on monitoring resolution. We have a
pyranometer at the site, and Enphase reported energy production as high
as 38% higher that predicted from irradiance data, as well as 38%
higher than the strin
This same issue has come up over the years for us..first with PV Powered
inverters and then noticed in Fronius as well..We have noticed in most
of our grid tied systems that are connected thru a "revenue grade meter" for
Oregon Energy Trust production reporting, that the inverter always has
All meters are analog at the point of measurement, because the signals that
are being measured are analog. What makes a meter "digital" is the
conversion of the original analog data to digital format and downstream data
manipulation. Therefore I doubt digital meters are fundamentally more or
less a
Makes you wonder what is officially calibrated to whatis digital more
accurate or analog utility meters...??
From: Marco Mangelsdorf
To: RE-wrenches
Cc: Douglas Bath
Sent: Thu, May 6, 2010 8:11:16 PM
Subject: [RE-wrenches] FW: Enphase performance
Marco
Friends:
When faced with similar situations, we propose installation of permanent
power monitoring equipment. Even if you don't get the job at this time,
the client may tire of buying fuel or listening to and maintaining 24/7
generators. When re-contacted, you will have the data you need. I
Marco,
My email doesn't seem to work on wrenches, so I am replying to you directly.
We definitely experienced an overstatement.
We have a client who installed 5kW on a string inverter and 5kW on enphase
and it is that side-by-side comparison that enabled us to positively
identify a proble
As a bit of a swerve off the path of this stringI am designing a grid-tie
system for a building that is being "greenovated". Trying to lock down a LEED
req'd percentage shaving of annual demand. I know there is a place to find
assumptions from DOE, but I'm not that confident in those because
Hi Bob-O,
Are you aware that the below news is no longer being reported on the NABCEP
website?
IMHO, a short lived "welcome" to ULU.
"Nicely managed" becomes an even more appropriate comment, now.
Doesn't competition make you stronger?
Thanks,
Bill Loesch
Solar 1 - Saint Louis Solar
- Or
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