One could interpret that if you have 6 or more inverter breakers getting
combined in a panel, you'd want one main breaker so that you wouldn't
have to turn off all ten individually to disconnect the system.
Something else to ask the AHJ.
Peter Parrish wrote:
When we use a sub-panel to combine
Since Peter is talking about a subpanel, we can assume that it is not the
main service for a building/structure, and would not be subject to the
disconnect requirements of NEC articles 225 and 230. In general, as long as
the subpanel is in the same building or structure as the main service, it is
n
Since the topic of AFI's has come up I wonder if anyone has actually tested
one, even an AC one.
From what I've read from some tests on the Mike Holt site for AC breakers is
that they couldn't get them to work at anything less than standard ISC for the
breaker.
thanks,
jay
peltz power
On A
Here's the latest comments from my customer on this. Seems to be just a problem
under reduced array output.
Thanks again for everybody's valuable input.
R. Walters
r...@solarray.com
Solar Engineer
Begin forwarded message:
> From: "Roger L. Johnson"
> Date: April 5, 2010 9:02:03 AM MDT
> To: Ra
Good Luck.
pat
In a message dated 4/2/2010 6:09:34 P.M. Pacific Daylight Time,
joel.david...@sbcglobal.net writes:
Wrenches,
I need 5 Astropower (or GE) APX-140 or equivalent 36-cell modules to
replace
customer's broken modules. Please contact me off-list. Thanks in advance.
Best regards
Here is a bit more on how RE-BULK and RE-FLOAT interact with the ABSORB
timer. All battery voltages are default and are given as 12VDC nominal,
multiply by 2 for 24V and 4 for 48V systems. All of the following is
true for grid-tie GV or GT FXs only.
Definitions:
BULK - Constant high current inc
Thanks very much Steve;
I still have 2 questions: does the temp sensor control all voltage set points
or just absorption and float voltage?
2) I'm still a little confused about the absorption time, and refloat, rebulk
features. for instance, what is the difference between refloat and rebulk?
A
I think the 100% rating exception is an interpretation issue. I consider the
assembly to be defined as the breaker mounted in its listed enclosure.
I agree that the AFIs would add cost, but they might actually offer some
protection too. (possibly one AFI unit could offer protection for multiple
Esteemed Wrenches,
How much voltage overhead should we have available on our arrays to
allow for inverters not to fall out of their DC voltage operating
range? Since the module power degradation is 20% over the warranty
period, I usually shoot for a module voltage that can drop 20% and
still
Sell RE and Refloat are not Temp Compensated,
Absorb, Float Voltages and EQ are temp Compensated.
Older Grid tie inverters using firmware revision 75 utilized temperature
compensated voltage with the Sell RE, but new versions such as 76 and
above don't.
"2)What is the difference between
Ray:
It is my analysis that combiner breakers (if present) will protect only
wiring upstream of the combiner -- that is, the individual string
circuits. This protection would happen if there is a fault in one
individual string (in the wiring or the modules) that allows current from
other str
Ah, now we might be on to something. If float voltage is temp compensated, and
sell voltage is not, at cold temps we could see the sell voltage go below float
voltage, which can cause "strange things to happen" as Steve mentioned in an
earlier email.
Thanks,
Ray
Begin forwarded message:
> Fr
HI Drake,
Its unlikely that all of the wattage degradation of the module would be in
volts only.
In conversations I've had with experts, most numbers appear to be 1/2 volts and
1/2 amps.
But if you can get your modules to get a 20% over there is no draw back except
a small % efficiency loss fr
HI Steve,
Is there a logic to the change between < 75 and 76> regarding loss of temp
comp for Sell RE?
thanks,
jay
peltz power
On Apr 5, 2010, at 2:11 PM, Steve Higgins wrote:
> Sell RE and Refloat are not Temp Compensated,
> Absorb, Float Voltages and EQ are temp Compensated.
>
> Older Gr
hello Wrenches,
We recently had an interesting (amusing?) experience that I thought might be
worth sharing and to get some feedback.
I received a call from a fellow contractor that had a ground fault in his PV
system (Wattsun DA tracker, 24 Siemens (Shell?)110, 1 string, Sunny Boy 2500).
The
Wrenches,
Pat's right. It's unlikely that any Astropower APX-140 or APX-130 modules are
laying around. I can use 7 matching 36-cell modules rated around 15.7 Vmp and 8
amps. Please contact me off-list. Thanks in advance.
Best regards,
Joel Davidson
- Original Message -
From: solar..
Tom,
Your dc clamp-on meter would have saved you from removing a conductor that
had current on it. It is likely a lightning event caused the LA602 to do its
job-thus the cracked case. The dc clamp-on meter would have shown the
current flowing into the SOV and on to ground.
Bill.
From: r
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