Are AC coupled systems with no DC loads exempted
from the grounding rules of DC coupled, battery
based systems and the rules of DC grounding?
This is from the Sunny Island Manual:
"External grounding of the negative pole of the
batteries is possible, because the batteries
and the grid side are galvanically isolated within the Sunny Island.
Dimenssion the crossâsection of the
protective conductor sufficiently. Thus you are
ensuring that in the event of a fault the high
currents occurring can be discharged with
an external grounding.
If groounding of the negative pole of the
battery is necessary, assemble this outside of
the Sunny Island.
As far as I am aware, the NEC code is kind of
vague on grounding battery banks (please correct
me if I am wrong), it is more of a AHJ requirement.
There is no reference to ground (DC side) inside the SI.
SMA America, LLC
Steve Jefferson
Supervisor, Service Line
6020 West Oaks Blvd, Suite 300
Rocklin, CA 95765 - 3714
U.S.A.
Tel: +1 916 625 0870
Fax: +1 916 624-2445
Service Line +1 877 697 6283 (Toll Free)
Email: steve.jeffer...@sma-america.com
<http://www.sma-america.com/>www.SMA-America.com
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From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of August Goers
Sent: Wednesday, April 10, 2013 2:13 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Fuse sizing in battery circuits
Steve,
So if we wanted to ground the negative would we
literally run a ground wire to one of the
battery terminals? Is there anything in the NEC
that governs this? What are the deciding factors
when deciding to ground the negative or not?
As a separate note, I've noticed that the
negative battery terminals measure 0 volts to
ground on a Sunny Island setup once everything
is connected without any extra grounding added.
I thought that there must be some reference to
ground happening in the Sunny Island but apparently I'm wrong.
Thanks, August
From:
<mailto:re-wrenches-boun...@lists.re-wrenches.org>re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Steve Jefferson
Sent: Wednesday, April 10, 2013 9:56 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Fuse sizing in battery circuits
If the Batt negative is not bonded to ground,
then yes SMA recommends fusing both Positive and Negative.
Also, the negative is not bonded to ground internally in the Sunny Island.
SMA America, LLC
Steve Jefferson
Supervisor, Service Line
6020 West Oaks Blvd, Suite 300
Rocklin, CA 95765 - 3714
U.S.A.
Tel: +1 916 625 0870
Fax: +1 916 624-2445
Service Line +1 877 697 6283 (Toll Free)
Email: <mailto:steve.jeffer...@sma-america.com>steve.jeffer...@sma-america.com
www.SMA-America.com
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