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
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
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
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
Hi Nick,
You bring up a good point that Enphase should address more clearly.
However, I think the math should be done section by section to accurately
account for the wire loss and not the total combined amps for the entire length.
If the loss's are too high then reducing the number in each
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
-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
-wrenches.org] On Behalf Of David
Brearley
Sent: Friday, June 11, 2010 4:04 PM
To: RE-wrenches
Subject: 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
I just attended a training class in Philly last week by Enphase technical staff and my notes say they suggest up to 15 micro-inverters @ 190 watts each per string with no problem. They also are now shipping their dual module micro-inverter which should help with this wire issue since this model
values are from
Chapter 9 Table 8 of the NEC
Darryl
--- On Fri, 6/11/10, Jeff Yago jry...@netscape.com wrote:
From: Jeff Yago jry...@netscape.com
Subject: Re: [RE-wrenches] AC wiring loss on micro-inverters
To: k...@vtsolar.com, RE-wrenches re-wrenches@lists.re-wrenches.org
Date: Friday, June 11
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