Yep... the owner wondered why they fuses didn't blow earlier. I had to explain that the panels are at 5% tilt and here in SW FL the sun rises to 85 degrees above the horizon come summer. There was never a problem in the winter and spring!
The 7.69 Imp per string should have been the obvious tip-off. 2 x 7.69 = >15A. 36A max on the combined input terminal is a nice feature. As soon as I saw the 30A discos next to the inverters I wondered why they were landing on the fused inputs. Without the 1-line in my hand, that was a good tip-off, too. Jason Szumlanski Fafco Solar On Thu, Aug 30, 2012 at 2:35 PM, Andrew Truitt <atru...@gmail.com> wrote: > > Ahh yes, the old "combine strings before landing on a fused DC input > terminal" trick. Sure to blow the fuse the first sunny day. This is why > SMA created their fuse-bypass DC input terminal. I take it the installer > was not aware of this... > > > > For a brighter energy future, > > > Andrew Truitt > NABCEP Certified PV Installer™ (ID# 032407-66)**** > > Principal > Truitt Renewable Energy Consulting**** > > (202) 486-7507**** > > http://www.linkedin.com/pub/andrew-truitt/8/622/713 > > > > > On Thu, Aug 30, 2012 at 11:53 AM, Jason Szumlanski > <ja...@fafcosolar.com>wrote: > >> I was sent to look at another contractor's work, and found three SB5000 >> inverters with blown string input fuses. I was able to determine the reason >> pretty quickly, and was later sent the original 1-Line, which was installed >> per the drawings. The 1-Line came from a "leading system integrator" who >> shall remain nameless. >> >> See anything wrong? >> >> https://www.sugarsync.com/pf/D6539806_8669786_010829 >> >> Just goes to show you - the contractor needs to take responsibility and >> verify the specifications are correct, safe, and code compliant. >> >> Jason Szumlanski >> Fafco Solar >> >
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