[RE-wrenches] Tranformless inverter

[Darryl Thayer]

Hi William, The PV side has to be ungrounded. the inverter provides GFDI.  The AC side is as normal.  If one is installed both of the DC side conductors have to be disconnected at the same time.  If one of the DC conductors becomes grounded it will blow the AC side OCPD.  There is a large AC signal on the DC side. 
Darryl   

--- On Tue, 9/28/10, William Miller <william at millersolar.com> wrote:


From: William Miller <william at millersolar.com>
Subject: [RE-wrenches] Tranformless inverter
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Date: Tuesday, September 28, 2010, 11:52 PM


Wrenches:

I received an advertisement from a distributor that SMA is now shipping 8, 9 and 10 KW transformerless inverters.  Don't these require double insulated PV wiring and no connection  to ground on the AC side? It's been too long since this subject last crossed my desk and I want to refresh my memory on the specifics.

William Miller



Please note new e-mail address and domain:

William Miller 
Miller Solar
Voice :805-438-5600
email: william at millersolar.com
http://millersolar.com
License No. C-10-773985

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