high voltage systems without dc discos [RE-wrenches]

[John Berdner]

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Jerry / Wrenches:

DC disco's are required by Code for all PV systems not just HV ones.
BE careful about the selling points of other inverters re: included DC
disconnect.  In additon to the load break / no load break issue there is
another item to look out for.  I have spoken to both J. Wiles and UL
about his in great length and the DC disconect included in some
inverters DOES NOT meet the code requirement for a DC disconnect.  The
inverter is considered a serviceable item and so you have to be able to
remove the inverter and have the remaining parts of the installation in
a safe manner, i.e. no live wires left. 

The AES GC1000 and the new GT3.0 both use a seperate sub-enclosure for
the dc disconnect. This allows the inverter to be removed for service
while still leaving the dc disconnect in place to meet the Code
requirement. This is how it should be done if the DC disconnect is
included in the inverter.  If it was not done this way then you still
need an external disconnect to meet code.

Best Regards,

John Berdner

>>>

Wrenches,

A selling point being given to us for the "other"
(sharp, fronius, xantrex) high voltage string
inverters is that we don't need an external high
voltage DC disconnect due to the one being provided on
board the inverter.

While in the process of giving competing quotes when I
know my competitors are specifiying the newer
inverters, I have been tempted to not include a DC
disco to keep my price as low as possible.  But when I
think of the inevitable swap out(s) over the life of
the system, I can't bring myself to jeopardize the
safety of future techs who will be performing the
swaps.  I'm acually ok with the thought of myself
taping off wires and pulling an inverter off the wall.
 The lack of control I have over what others may do
down the line is what bothers me.

Does anyone feel differently?  Are wrenches intalling
high voltage systems without discos?

=====
Jerry Caldwell
NABCEP Certified PV Installer
Light Energy Systems
965 Detroit Ave
Concord, CA 94518

925-680-4343 office
510-205-2798 mobile



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