[RE-wrenches] Fault Current

[Karl Jaeger]

Nathan,
The only explanation the electrical distributor provided is seen below. They are really skirting a thorough explanation...
The distributor engineer does not view the inverters as a negative load, and states they will exceed the 500A fault current limit the site is designed for.
Thanks,
Karl

From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Nathan Charles
Sent: Thursday, March 27, 2014 2:03 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Fault Current

Karl,

Can you give us some more details on their concerns?  I've done some very large single phase ag installs and the only time I've had issues is when we exceed the 80% of minimum load on the medium voltage feeder.

Best,

-N

On Thu, Mar 27, 2014 at 2:51 PM, Karl Jaeger <kjaeger at lightwavesolar.com<mailto:kjaeger at lightwavesolar.com>> wrote:
Dave,
We are about as rural as we can get here.... farm land. Very good document, nonetheless.
Karl

From: re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org> [mailto:re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>] On Behalf Of Dave Click
Sent: Thursday, March 27, 2014 1:29 PM
To: re-wrenches at lists.re-wrenches.org<mailto:re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Fault Current

Karl, you're interconnecting into a spot/area network, right? It's a real concern; some solutions and background on the issue here:
http://www.nrel.gov/docs/fy09osti/45061.pdf

DKC
On 2014/3/27, 14:05, Karl Jaeger wrote:
Esteemed Wrenches,
We've recently run into an issue with a local distributor citing network fault current on a split-phase service as a reason to prevent interconnection of our customer's solar array. They've given us the options of reducing our system size from 36.5kW-DC to 15kW-DC, or having the customer upgrade to 3-phase at a soft price of $20-30K. We're looking at 32kW of inverters on a 167kVA transformer.

Does anyone have experience on circumventing the issue of network fault current? Any experience with Fault Current Limiters?

Much appreciated,

Karl Jaeger
Design/Build Engineer
LightWave Solar Electric LLC




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--
Nathan Charles
Engineer
NABCEP Certified PV Installation Professional #042013-20
Paradise Energy Solutions
(717) 283-2021 direct
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