Eric:
Thanks for the research. I confess that I commented on an inverter system
I knew little about. My thanks to Darryl for keeping me honest, and for
the kind words. I had assumed that all modern inverters are certified to
prevent back feed, but this needs to be checked for each new inver
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
a
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
separat
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 ele
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 tal
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
To: RE-wrenches
Date: 2010/11/14 12:54
Darryl:
If Aurora can not verify that their i
I have searched the net and cannot find any photos of this fire damage, or any report that explains the damamge in detail. What about the installer? Have they stepped up to investigate, or perhaps the fire marshall? When these things happen everybody heads to their corners, but we all would ben
All,
I'd also like to thank Matt for talking about fires, fuses and safety in
his last 2 posts. I have mostly done off grid but recently installed a GT
8KW system that runs 410 vdc per string.
I have not installed the fuses in the combiner yet (the utility just
blessed the system late last week)
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 A
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 wrote:
From: William Miller
Subject: Re: [RE-wrenc
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 transformerles
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