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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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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