[RE-wrenches] center feeding Enphase

Gary Willett gary at icarussolarservices.com
Fri Jan 4 10:03:37 PST 2013


JESSE & JASON:

There was a thread from about 6 weeks ago

    Re: [RE-wrenches] Best practices for conduit penetration on roof

about the use of the SolaDeck as a roof-top AC Source Circuit combiner, 
and as a roof-top disconnecting means.

I have two issuesyou should be consider before deciding to use the 
SolaDeck Models 0760-41AD and 0766-41AD:

1. The Temperature De-Rating of the existing ABB breakers sold by 
SolaDeck could cause high temperature "nuisance trips", particularly on 
maximum sized AC strings of 17 Enphase micro-inverters. If a high(er) 
temperature rated circuit breaker is not available from ABB, a prudent 
design would reduce the maximum number of micro-inverters in an AC 
string to 12.

    _Manufacturer_:  ABB 20A 2-pole din-mounted circuit breaker

    _Terminal Temp Rating_: 75C / 167F

    _Reference Temperature_: 20C / 68F

    _Ambient Temp Derating_:
    30C/86F = 18.7A
    40C/104F = 17.3A
    50C/122F = 15.8A
    60C/140F = 14.1A
    70C/158F = 12.2A

2.  Another issue, at least in some jurisdictions, is the requirement 
for a roof-top AC Disconnect for micro-inverter systems. The SolaDeck, 
when used as an AC SCCB, may not meet the NEC Article 100 definition for 
"readily accessible" because a tool is required to open it.


Regards, Gary


On 1/3/2013 7:44 AM, Jason Szumlanski wrote:
> SolaDeck Models 0760-41AD and 0766-41AD are rated for up to 60A at 
> 240Vac.
>
> Give them a call - Steve is very helpful.
>
> *Jason Szumlanski*//
>
> /Fafco Solar
> /
>
>
> On Wed, Jan 2, 2013 at 11:57 PM, Jesse Dahl <dahlsolar at gmail.com 
> <mailto:dahlsolar at gmail.com>> wrote:
>
>     I find info about the AC soladeck in my distributors catalog, but
>     I don't find any information about it on Soladeck's website.
>
>
>
>
>     On Wed, Jan 2, 2013 at 7:18 PM, Jesse Dahl <dahlsolar at gmail.com
>     <mailto:dahlsolar at gmail.com>> wrote:
>
>         Hello,
>
>         I am in the process of installing a Enphase system that
>         requires center feeding the individual 15 modules circuits. I
>         am wondering about wiring the J-Box.  I need to cut all of the
>         boxes into the center of the runs of Engauge cable and
>         maintain the 6" of free conductor.  To do this, I will need to
>         pull the trunk cable towards the J-Box.  There are a few spots
>         where doing this may pull the inverter connection points to
>         far from the inverter.  It looks like like the spots where
>         this will be a problem is where the circuit of modules is made
>         up of modules from different North-South rows of racking. I
>         took some rough measurements at the end of the day,
>         but haven't really laid the cable out to check if it will
>         really be problem.
>
>         I'm sure this is common, and easily fixed, but a conformation
>         from another installer would surely be welcome.
>
>         Thanks,
>
>         Jesse
>
>
>
>
>
>
>
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