[RE-wrenches] Fault Current

[Nathan Charles]

Karl,

I'm taking a guess here but are you doing a supply side connection?  What
is the ratings of the devices in the main disconnect grouping?

Best,
-N


On Thu, Mar 27, 2014 at 3:28 PM, Karl Jaeger <kjaeger at lightwavesolar.com>wrote:

>  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>
> 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] *On Behalf Of *Dave Click
> *Sent:* Thursday, March 27, 2014 1:29 PM
> *To:* 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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-- 
Nathan Charles
Engineer
NABCEP Certified PV Installation Professional #042013-20
Paradise Energy Solutions
(717) 283-2021 direct
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