Nick,
We do not offer a T cable, but that's a great idea. I'll shop it
around and see what comes out of it. By the way, the Soladeck seems to
be a great product. For residential rooftops it also allows you to go
directly through a roof penetration and transition to Romex
immediately. Makes a very clean installation.
See ya!
Marv
707 763-4784 x7016
Nick Soleil wrote:
Thanks
David and Marv:
I appreciate the feedback, and have considered the center tap
option. However, I have prefered to either divide the arrays into
lower amp circuits (10-12 modules per circuit, depending on the
wattage) or to run two AC homerun cables to two half length strings (2-
7 modules strings) per and then combine them at the Soladeck/Combiner
Box. Does Enphase offer the center tap cable on its price lists?
Nick Soleil
Project Manager
Advanced Alternative Energy Solutions, LLC
PO Box 657
Petaluma, CA 94953
Cell: 707-321-2937
Office: 707-789-9537
Fax: 707-769-9037
From:
David Brearley <david.brear...@solarprofessional.com>
To: RE-wrenches
<re-wrenches@lists.re-wrenches.org>
Sent: Fri, June 11,
2010 1:04:13 PM
Subject: Re:
[RE-wrenches] AC wiring loss on micro-inverters
Re: [RE-wrenches] AC wiring loss on micro-inverters
Maybe Marv can help out here. I’ve talked
with tech support at Enphase and am under the impression that you can
center tap their branch circuits to reduce voltage drop. This technique
was used on a project that we profiled in SolarPro:
http://solarprofessional.com/article/?file=SP3_2_pg92_Projects_1&search=
David Brearley, Senior Technical Editor
SolarPro magazine
On 6/11/10 2:50 PM, "Nick Soleil" <nicksoleilso...@yahoo.com> wrote:
Did you
notice that in my calculation I divided the total amperage by 2 to get
the average ampacity across the string. This seems to be the best way
to deal with that. Otherwise the loss would have been over 2.8%
Nick Soleil
Project Manager
Advanced Alternative Energy Solutions, LLC
PO Box 657
Petaluma, CA 94953
Cell: 707-321-2937
Office: 707-789-9537
Fax: 707-769-9037
From: "ma...@berkeleysolar.com" <ma...@berkeleysolar.com>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Sent: Fri, June 11, 2010 7:02:00 AM
Subject: Re: [RE-wrenches] AC wiring loss on micro-inverters
Nick,
Good to see other wrenches looking at this issue. However, remember
that
in the interconnect cable between the last and the second to last
Enphase,
the current is small. If you really want to see how the loss is adding
up
you need a more detailed analysis that averages the voltage drop for the
entire system of interconnect cables.
Mark Frye
Berkeley solar Electric Systems
> Hello wrenches and Marv:
> How many Enphase inverters do you put on a single parallel
string?
> The Enphase manual allows for up to 15, but I have found that a
single
> string of 15 can have very high voltage rise on the AC wiring. Up
to
> 1.5% loss just on the Enphase cables, and that does not take into
> account resistance at the plug connectors or any home-run wiring.
> 15 inverters x 190 watts = 2850 watts
> 2850 watts / 240 Volts = 11.875 Amps (however at the beginning
of the
> string it is 0 Amps)
> Average Amps on the Enphase cables is 11.875 / 2 = 5.9375 Amps
> length of contacts + internal wiring = ~6'
> Total Enphase cabling length (6' x 15 inverters) = ~90'
> 5.9375 Amps @ 240 V running 90' on #14 AWG CU = 1.4% loss
> It is pretty hard to design for 1.5% voltage drop if you have to
size for
> 0% loss on your wiring! I hope Enphase will increase the size of
the wire
> in their cables soon. Have you experienced issues with
micro-inverters
> shutting off due to high AC voltages?
>
> Nick Soleil
> Project Manager
> Advanced Alternative Energy Solutions, LLC
> PO Box 657
> Petaluma, CA 94953
> Cell: 707-321-2937
> Office: 707-789-9537
> Fax: 707-769-9037
>
>
>
>
> ________________________________
> From: i2p <i...@aol.com>
> To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
> Sent: Thu, June 10, 2010 4:50:47 PM
> Subject: Re: [RE-wrenches] Real world PV production
>
>
>
> On Jun 10, 2010, at 7:57:53 AM, "Kelly Keilwitz, Whidbey Sun &
Wind"
> <ke...@whidbeysunwind.com>
wrote:
>
> PV Watts VASTLY underestimate PV production
>> in our area.
> PV Watts underestimates in Central Ca too.
>
> Don
>
>
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