[RE-wrenches] combiner bus bar for Sunny Tower DC input?

[North Texas Renewable Energy Inc]

You will need a fuse for each inverter for the same reason you would need a
fuse for 4 PV strings.
Jim Duncan
North Texas Renewable Energy


  -----Original Message-----
  From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org]On Behalf Of Glenn Burt
  Sent: Tuesday, November 15, 2011 7:57 PM
  To: 'RE-wrenches'
  Subject: Re: [RE-wrenches] combiner bus bar for Sunny Tower DC input?


  Are you sure you need to split them?

  IIR, there are only a pair of conductors going from each SB into the
tower. They must be combined on the SMA side of the touch-safe fuse holders
in some way.



  We opted to run all our source circuits from array through 6 external
discos then into the ST instead of combining them - the distance in our case
was around 150'.



  -Glenn



  From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kirk
Herander
  Sent: Tuesday, November 15, 2011 8:10 PM
  To: 'RE-wrenches'
  Subject: Re: [RE-wrenches] combiner bus bar for Sunny Tower DC input?



  But I don't believe the Sunny Tower internally  has single conductor lugs
leading to the respective SB it's wired to. The DC tower input/output to
each respective inverter is effectively a combiner box which combines all
fused inputs to a single positive prewired to the respective SB inverter. I
have already combined the strings in an external box and need to "uncombine"
them through the individual fused strings in the SunnyTower.



  Kirk Herander

  VT Solar, LLC

  dba Vermont Solar Engineering

  NABCEPTM Certified installer Charter Member

  NYSERDA-eligible Installer

  VT RE Incentive Program Partner



  From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Brian
Teitelbaum
  Sent: Monday, November 14, 2011 8:28 PM
  To: RE-wrenches
  Subject: Re: [RE-wrenches] combiner bus bar for Sunny Tower DC input?



  Hi Kirk,



  The Sunny Boy inverters also have a pair of lugs for a single conductor
pair coming in from the array. They are meant to be used if you have an
external combiner. No bus bars as you describe are needed.



  Brian Teitelbaum

  AEE Solar



  From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kirk
Herander
  Sent: Monday, November 14, 2011 2:57 PM
  To: RE-wrenches
  Subject: [RE-wrenches] combiner bus bar for Sunny Tower DC input?



  Hello,



  The Sunny Tower has four individual fuse holders on the DC input of each
inverter. I am combining the array output for each inverter in a combiner
box before the tower, so there is only a single positive, negative, and gnd
going to each inverter's DC input. I want to fan this input out to each of
the four dc fuses via a combiner bus with a single lug and prongs which fit
directly into each fuseholders' input, ala the Outback combiner bus. Is
there something similar made for the SunnyTower dc input? I have not been
able to talk to SMA yet about this. Thanks.



  Kirk Herander

  VT Solar, LLC

  dba Vermont Solar Engineering

  NABCEPTM Certified installer Charter Member

  NYSERDA-eligible Installer

  VT RE Incentive Program Partner


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