[RE-wrenches] Up for a 1-Line Riddle?

[Jason Szumlanski]

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 <atruitt at 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 <jason at 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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