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

[David Brearley]

Yeah, that threw me at first, too. Especially since at 240 V, the ac output of that inverter is 21 A, which is half of the reported 42 A phase current. 

On Aug 30, 2012, at 3:56 PM, Dave Click wrote:

> Thanks David, I was in residential mode and just saw the 240V listed in the OCPD table!
> 
> On 2012/8/30 16:47, David Brearley wrote:
>> 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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