620 VDC [RE-wrenches]
Sky Sims
sky at ecologicalsystems.biz
Fri Jun 27 21:18:11 PDT 2008
I'm not aware of a rule that limits to 600volts. Finding components that
are UL listed and rated higher than 600volts might be difficult though.
Sky Sims
Ecological Systems
http://www.ecologicalsystems.biz
220 County Road 522
Manalapan, NJ 07726
732-462-3858 toll free)866-759-7652 fax)732-462-3962
-----Original Message-----
From: Walt Ratterman [mailto:wratterman at SunEnergyPower.com]
Sent: Thursday, June 26, 2008 4:01 PM
To: RE-wrenches at topica.com
Subject: RE: 620 VDC [RE-wrenches]
Drake:
I believe that if you are within the United States, this is not feasible
(exceeding the 600V limit). This is quite hard and fast NEC rule that
has
been in place for many years.
I suppose you could pursue some issues with using high voltage wiring
(rated
above 600V), but I believe you would be a pioneer in this, and you may
not
find it worth the extra 20 volts.
If you are going to go this route....push for 1000 volts. (like some
other
countries are doing.)
Just my humble opinion....
Thanks,
Walt Ratterman
SunEnergy Power International
www.sunepi.org
-----Original Message-----
From: Drake Chamberlin [mailto:Drake.Chamberlin at redwoodalliance.org]
Sent: Thursday, June 26, 2008 12:38 PM
To: RE-wrenches at topica.com
Subject: 620 VDC [RE-wrenches]
Hello Wrenches,
Some inverters are able to withstand voltages above 600 VDC. The
Solectria 95KW can take up to 620 VDC without harming the electronics.
If we size a system so that the record low temperature is gives a
voltage of under 620 VDC, a viable system can be installed. There is
a question, however, about the Code compliance of this, since
building wire is rated at 600 volts. Higher voltage wiring is
available, but will likely not be cheap or convenient to use. Also,
what about 600 V modules and PV cable?
Since this is DC, there are not any cycles to create a voltage
peak. A 600 VAC RMS nominal system can have (if my calculations are
correct) a peak voltage of close to 850 volts. Also, system voltages
can range up to 10% from the nominal, resulting in voltages of as
high as 660 VAC RMS on 600 volt systems.
The question is, "can we have a system with a possible
low-temperature, open circuit voltage of 620 VDC with wiring and
modules rated for 600 volts? Can the other 20 volts be considered
within the nominal range?
Thanks,
Drake
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