Yes
from all sources of supply, the transformerless inverter is a source of
supply. BOTH legs of all strings should be fused. It has always been that
strings shall be protected from all sources of supply, and only SMA had stated
that it will not back feed, This nature of the transformerless
I never thought I would disagree with William, I have the highest admiration
for him,
But the transformerless inverter has no seperation between grid and array, no
problem if everything is fused.
Darryl
--- On Sat, 11/13/10, William Miller will...@millersolar.com wrote:
From: William Miller
Darryl:
If Aurora can not verify that their inverters will not backfeed the DC
circuitry, then the circuits must be fused. This too is specified in
Berdner's study. We are in agreement.
I think SMA is not the only transformer inverter with a no-backfeed
declaration.
William
At 05:48
Fronius IG Plus on the spec sheet also specs Max. continuous utility
back feed current as 0A.
Original Message
Subject: Re: [RE-wrenches] Head Spinning..(Con) fused.
From: William Miller will...@millersolar.com
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Date: 2010/11/14
I just completed a system for a college that has four (4) Fronius IQ plus, and all the required Fronius data and interface boxes they have so it can connect to almost any outside device. My original agreement (2 years ago!) was to web monitor with Fat Spaniel the suggested web host, and when I
Colleagues:
Below is from a local building official. This is very preliminary so take
it as such:
William Miller
From what I've been told the fire was located in one of
the combiner boxes. It started as they were commissioning the system. We
had completed our final inspection and their
Thanks William and Daryl,
Here is Auroras backfeed stipulation from the installation manual:
Installation and Operator’s Manual Page 98 of 108
(PVI-3.0/3.6/4.2-OUTD-x-US Rev: 2.1)
*8.5 Input Source Backfeed Current*
PVI-4.2(3.6, 3.0)-OUTD-x-US Grid Tied Inverters are provided with two
Jeff,
If you don't need inverter-direct monitoring, you can use any CT-based 3rd
party system (eGauge, Fat Spaniel, Energy Recommerce, Deck, etc all offer
these, many charge for web-based hosting). If you want it to connect
directly (useful for getting alert emails if one inverter goes down), you
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