[RE-wrenches] fronius IG Plus practical engineering WAA???

[Allan Sindelar]

Nick,

This was addressed in the Fronius online newsletter that came out yesterday.

 


 

Two Buss Bars - the ins and outs of connection

Fronius buss bars
Sold individually. Make sure to order two Buss Bars - one for each leg of
the trip.


Fronius IG Plus Inverters have a six-string fused combiner built into every
unit. It may not be practical to use it if the array is far away from the
inverter or if local codes require fused combiners on the roof or in close
proximity to the modules themselves. In either situation it is important to
note that the terminals are only rated to accept 20ADC. 

Whenever you are bringing in a conductor that may have more then 20ADC on
it, you are required to use a Fronius Buss Bar (Part Number 42,0201,2923).
This is a six-tined copper conductor with 2-3/8" holes and a single 1/4"
hole for use with a lug of the installers' choice. 

We are dealing with DC currents here and once those electrons make their run
through the inverter they need a path back to the modules. Again, we cannot
load the terminals with more then 20ADC, so please make sure to get a second
Buss Bar for the return trip. 

If you have any questions about applications that would require a Buss Bar,
please contact Fronius Solar Technical Support at 810-220-4414 or e-mail
pv-us-support at fronius.com.

 

 

Allan Sindelar

Allan at positiveenergysolar.com

NABCEP Certified Photovoltaic Installer

EE98J Journeyman Electrician

Positive Energy, Inc.

3201 Calle Marie

Santa Fe, New Mexico 87507

505 424-1112

www.positiveenergysolar.com

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Nick Vida
Sent: Saturday, June 20, 2009 1:23 PM
To: re-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] fronius IG Plus practical engineering WAA???

 

hey Wrenches.

I opened my soon to be installed fronius IG Plus to see what was going on in
there, and found myself a bit disappointed. There is a 6 string combiner in
there which is fine, however there is no bypass for the fusing section and
the terminals are rated at 20 amps. In a situation where you have 6 strings,
you cannont combine on the roof and run down with a pair of conductors,
instead you must run down with your strings. This means instead of running
3/4 conduit for 8awg pair and ground, I would have to run 1" conduit for 6
pairs of 10 awg and ground. 
(thats a lot of flex for a 2x4!!)  So if I need a disconect on the roof, I
would need 2 disconects, and correct me if im wrong-- but i would need 4
disconects in the future because this is a transformerless inverter. 
I also noticed that they are still using those mediocre white plastic
terminals for the ac connection that so many people found annoying.
And fyi, there are no fuses in the fusing section, so dont forget to order
them.

 

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