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

[David Brearley]

I'm assuming it's a balanced 3-phase interconnection, which fits with the reported phase current of 42 A:

(3 x 5000 W) / 208 V / 1.73 = 41.7 A

Or more simply:

24 A per inverter x 1.73 = 41.5 A

However, no one reviewing a single-line should have to guess about the service type....

On Aug 30, 2012, at 3:12 PM, Dave Click wrote:

> I've seen that one a lot, too. And not to quibble, but the 1-line depicts this correctly (no inline fuse shown in the inverter DC disconnect box), though there should be a note making this more explicit.
> 
> Speaking of sunny days turning off the system, how about the 3 30A inverter breakers' combined feed going into a 55A breaker. Also... a 55A breaker? Really? I guess the designer wanted to leave a little headroom to avoid scaring the 60A disconnect.
> 
> DKC
> 
> On 2012/8/30 14:35, Andrew Truitt 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 <tel:%28202%29%20486-7507>____
>> 
>> http://www.linkedin.com/pub/andrew-truitt/8/622/713
>> 
>> 
>> 
>> "Don't get me wrong: I love nuclear energy! It's just that I prefer
>> fusion to fission. And it just so happens that there's an enormous
>> fusion reactor safely banked a few million miles from us. It delivers
>> more than we could ever use in just about 8 minutes. And it's wireless!"
>> 
>> ~William McDonough
>> 
>> 
>> 
>> 
>> 
>> 
>> On Thu, Aug 30, 2012 at 11:53 AM, Jason Szumlanski <jason at fafcosolar.com
>> <mailto: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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