[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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