SMA long distance Grid tie [RE-wrenches]

[Geoff Greenfield]

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Thanks John -

I was describing the sending of each DC series string as a single circuit.
I guess with the "letter" from Sq-D I could paralell the 2 strings at the
pole-mounted DC disco but The wire worked out the same to pull 4 small runs.

Sincerely,

Geoff Greenfield
NABCEP Certified Solar PV Installer TM
GLREA Certified Photovoltaic Systems Integrator/Installer License Number
0211-01

THIRD SUN SOLAR AND WIND POWER Ltd.
340 West State Street, Unit 25
Athens, OH 45701

Phone (740) 597-3111
Fax   (740) 597-1548

www.third-sun.com



Date: Wed, 08 Sep 2004 16:59:28 -0700
From: "John Berdner" <JBerdner at sma-america.com>
Subject: RE: SMA long distance Grid tie [RE-wrenches]



Geoff:

I was a bit confused by your description of the long dc wiring.
I may have got it wrong but...
I want to point out is that you can not parallel the DC at the array,
run it a long way over 1 big pair, and then split it out at the
inverters.
Here in the US we have those pesky grounding requirements and GFDI
circuity.
If you parallel the dc and then connect multiple inverters to the dc
bus each inverter will see the next as a ground fault and will not start
up.

Best Regards,

John Berdner


Sounds complicated -

I would look at the option of sending the DC over that distance and
putting
all the inverters next to the AC interconnection point. In a smaller
application (SB1800) I chose 4 #10 DC wires (and isolated grounds)over
a
2/0 pair with #6 ground tie that the AC run would have needed. With
reasonable runs I prefer the inverter on the pole under the array, but
with
wire prices through the roof I penciled it out and trenched the DC.

Sincerely,

Geoff Greenfield

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