Re: [RE-wrenches] Sol-Ark install

[Christopher Warfel via RE-wrenches]

I talked to SolArk about the input amperage limitation on a recent 
project. Someone correct me if I am wrong, but SolArk does automatically 
limit excess amperage.  We were very close on the limit and it made no 
sense to me that they would design something with parallel MPPT that 
limit one to one string.  In any case, I was informed by SolArk that 
they do current limit when in excess of 18.  Chris Warfel


On 4/14/2022 1:00 PM, Darryl Thayer via RE-wrenches wrote:
Hi, Ron, Yes, you must be careful of the MPPT inputs.  You state 
Sol-Ark has an 18 amp max input, meaning you can not have more than 1 
string supplying an MPPT if your 60 cell modules are 10 amps Isc.  You 
state Sol-Ark has a maximum voltage per MPPT of 500 volts, this 
voltage is _not Voc x number of modules._  The Voc must be temperature 
corrected.  find the lowest temperature for your region, check code 
book 690.7a table and there is a table of temperature correction 
factors, use these factors to correct Voc at STC to Voc at your lowest 
temperature.   For example if your lowest temp is -10 F the code says 
(x1.2) so your 40 volts becomes 40 x 1.2 = 48 volts and the max number 
of modules is 10 per string


On Tue, Apr 12, 2022 at 9:42 PM Ron Young via RE-wrenches 
 wrote:


Hi Wrenches, trying to wrap my head around a first time Sol-Ark
install. Because the max DC voltage is 500v at 18a  and the PV I’m
using is 40v DC each I will have to create three strings each
480v. What would be the best choice for a home run wire? I’ve
always used smaller strings with micro inverters, a combiner at
the array and a single Teck home run cable but the string inverter
presents a different scenario and it looks like I’ll need to use
three home run cables, one for each string.

Ron Young

earthRight Products - Solareagle.com 
Alternative Energy Solutions ~ Renewable Energy Products


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--
            Christopher Warfel
                 ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
                                401-466-8978


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Re: [RE-wrenches] Sol-Ark install

[Kirk Herander via RE-wrenches]

Sorry, just noticed the photo, great idea!

On Thu, Apr 14, 2022 at 12:58 PM Kirk Herander  wrote:

> Thanks, I'd love to see some photos if you have them online somewhere. I
> was impressed by your multi-breaker bypass interlock. Too bad no OEM can
> think it through like that.
>
> On Thu, Apr 14, 2022 at 12:51 PM William Miller via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
>> Kirk:
>>
>>
>>
>> I feel your pain.  This is a big problem that we discovered with the
>> first GSLC we installed.  We ordered it prewired and it was a mess.  We
>> broke the tab off of one of the AC breakers by too much wire stress.  We
>> had to come up with a work-around for this problem.  I will describe it
>> below in hopes you find some use for this procedure.
>>
>>
>>
>> You can skip installing AC breakers in the GSLC and that frees up a lot
>> of room.  To make this work you need to supply an outboard breaker panel
>> for Generator fed circuits and another for Inverter fed circuits.  The AC
>> leads run straight through the GSLC without landing.  You can remove all of
>> the AC buss bars.
>>
>>
>>
>> If you want bypass capabilities you need to provide for this in the
>> inverter fed-panel.  Most breaker manufacturers provide interlocks for two
>> breakers.  If you want more interlock capabilities you need to make a
>> custom interlock.  Let me know if you want more information on that process.
>>
>>
>>
>> For the PV leads, we cut off the bottom tab that holds the dead front and
>> replace it with a hinge.  We lower the dead-front for wiring.  The PV leads
>> all come up the back of the dead-front and hinge at the bottom.  See
>> attached photo.
>>
>>
>>
>> I hope this information helps.  The Radian is a good product in my
>> opinion and it is worth the effort to get around the limitation.
>>
>>
>>
>> William Miller
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>>
>>
>> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
>> Behalf Of *Kirk Herander via RE-wrenches
>> *Sent:* Thursday, April 14, 2022 8:30 AM
>> *To:* RE-wrenches
>> *Cc:* Kirk Herander
>> *Subject:* Re: [RE-wrenches] Sol-Ark install
>>
>>
>>
>> I feel the same way about the Outback Radian GSLC box, once it's fully
>> wired there's no room whatsoever, and sometimes you have to remove
>> breakers and layers of wiring to re-access things for debug. Don't know how
>> it meets code and ETL approval  for wire space.
>>
>> On Thu, Apr 14, 2022 at 11:20 AM Jason Szumlanski via RE-wrenches <
>> re-wrenches@lists.re-wrenches.org> wrote:
>>
>> This problem is not limited to one manufacturer. One example is the
>> Enphase smart controller. While the small holes are big enough for #6
>> ground and neutral, you have to strip the wires perfectly and have the hand
>> of a heart surgeon to get them in there. And conduit entry is a royal pain
>> because the enclosure is tapered on the bottom and sides.
>>
>>
>>
>> Fortunately, all of these manufacturers seem to be making strides to make
>> the roof installation easier. A little more attention to the electrical
>> enclosures would be appreciated.
>>
>>
>>
>> Jason Szumlanski
>>
>>
>>
>>
>>
>> On Thu, Apr 14, 2022, 10:30 AM Dana Orzel via RE-wrenches <
>> re-wrenches@lists.re-wrenches.org> wrote:
>>
>> We have done one Solark installation & I was shocked as to the lack of
>> ground wire landing terminals & space. We added a 12126 metal box below to
>> ease the # of entrances to two 11/4”.
>>
>>  I jumpered a # 8 to a second ground bar to allow for additional landing
>> locations. I called Solark to question this & the response to the question
>> was “yeah we have heard this from other installers “.
>> End of call.
>>
>> Dana Orzel
>>
>> C: 208.721.7003
>>
>> E- d...@solarwork.com
>>
>>
>>
>> On Apr 13, 2022, at 8:21 PM, Maverick Brown via RE-wrenches <
>> re-wrenches@lists.re-wrenches.org> wrote:
>>
>> Ron
>>
>>
>>
>> The Sol-Ark has two MPPT channels and has two separate landing spots for
>> each MPPT channels. Each landing pair needs matching strings. 8 AWG wire
>> barely fits so the Sol-Ark PV terminals

Re: [RE-wrenches] Sol-Ark install

[Kirk Herander via RE-wrenches]

Thanks, I'd love to see some photos if you have them online somewhere. I
was impressed by your multi-breaker bypass interlock. Too bad no OEM can
think it through like that.

On Thu, Apr 14, 2022 at 12:51 PM William Miller via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Kirk:
>
>
>
> I feel your pain.  This is a big problem that we discovered with the first
> GSLC we installed.  We ordered it prewired and it was a mess.  We broke the
> tab off of one of the AC breakers by too much wire stress.  We had to come
> up with a work-around for this problem.  I will describe it below in hopes
> you find some use for this procedure.
>
>
>
> You can skip installing AC breakers in the GSLC and that frees up a lot of
> room.  To make this work you need to supply an outboard breaker panel for
> Generator fed circuits and another for Inverter fed circuits.  The AC leads
> run straight through the GSLC without landing.  You can remove all of the
> AC buss bars.
>
>
>
> If you want bypass capabilities you need to provide for this in the
> inverter fed-panel.  Most breaker manufacturers provide interlocks for two
> breakers.  If you want more interlock capabilities you need to make a
> custom interlock.  Let me know if you want more information on that process.
>
>
>
> For the PV leads, we cut off the bottom tab that holds the dead front and
> replace it with a hinge.  We lower the dead-front for wiring.  The PV leads
> all come up the back of the dead-front and hinge at the bottom.  See
> attached photo.
>
>
>
> I hope this information helps.  The Radian is a good product in my opinion
> and it is worth the effort to get around the limitation.
>
>
>
> William Miller
>
>
>
> Miller Solar
>
> 17395 Oak Road, Atascadero, CA 93422
>
> 805-438-5600
>
> www.millersolar.com
>
> CA Lic. 773985
>
>
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
> Behalf Of *Kirk Herander via RE-wrenches
> *Sent:* Thursday, April 14, 2022 8:30 AM
> *To:* RE-wrenches
> *Cc:* Kirk Herander
> *Subject:* Re: [RE-wrenches] Sol-Ark install
>
>
>
> I feel the same way about the Outback Radian GSLC box, once it's fully
> wired there's no room whatsoever, and sometimes you have to remove
> breakers and layers of wiring to re-access things for debug. Don't know how
> it meets code and ETL approval  for wire space.
>
> On Thu, Apr 14, 2022 at 11:20 AM Jason Szumlanski via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
> This problem is not limited to one manufacturer. One example is the
> Enphase smart controller. While the small holes are big enough for #6
> ground and neutral, you have to strip the wires perfectly and have the hand
> of a heart surgeon to get them in there. And conduit entry is a royal pain
> because the enclosure is tapered on the bottom and sides.
>
>
>
> Fortunately, all of these manufacturers seem to be making strides to make
> the roof installation easier. A little more attention to the electrical
> enclosures would be appreciated.
>
>
>
> Jason Szumlanski
>
>
>
>
>
> On Thu, Apr 14, 2022, 10:30 AM Dana Orzel via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
> We have done one Solark installation & I was shocked as to the lack of
> ground wire landing terminals & space. We added a 12126 metal box below to
> ease the # of entrances to two 11/4”.
>
>  I jumpered a # 8 to a second ground bar to allow for additional landing
> locations. I called Solark to question this & the response to the question
> was “yeah we have heard this from other installers “.
> End of call.
>
> Dana Orzel
>
> C: 208.721.7003
>
> E- d...@solarwork.com
>
>
>
> On Apr 13, 2022, at 8:21 PM, Maverick Brown via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
> Ron
>
>
>
> The Sol-Ark has two MPPT channels and has two separate landing spots for
> each MPPT channels. Each landing pair needs matching strings. 8 AWG wire
> barely fits so the Sol-Ark PV terminals so they may only be rated for
> 10AWG.
>
>
>
> I’m assuming you have a ground array  The most common stringing method
> would be to use a trench with conduit and THHN wire. You could also sleeve
> a direct-burial cable into the ground.  Calculate the voltage drop over the
> distance to make sure 10AWG is adequate. If not, then make a junction, like
> a MidNite or Outback combiner or an IMO switch at the array to get up the
> right wire size, with an added MidNite Surge Protector or EMP shield
> device. If it’s a long distance (larger wire size), add another combiner at
> the inverter 

Re: [RE-wrenches] Sol-Ark install

[Darryl Thayer via RE-wrenches]

Hi, Ron, Yes, you must be careful of the MPPT inputs.  You state Sol-Ark
has an 18 amp max input, meaning you can not have more than 1 string
supplying an MPPT if your 60 cell modules are 10 amps Isc.  You state
Sol-Ark has a maximum voltage per MPPT of 500 volts, this voltage is *not
Voc x number of modules.*  The Voc must be temperature corrected.  find the
lowest temperature for your region, check code book 690.7a table and there
is a table of temperature correction factors, use these factors to correct
Voc at STC to Voc at your lowest temperature.   For example if your lowest
temp is -10 F the code says (x1.2) so your 40 volts becomes 40 x 1.2 = 48
volts and the max number of modules is 10 per string

On Tue, Apr 12, 2022 at 9:42 PM Ron Young via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hi Wrenches, trying to wrap my head around a first time Sol-Ark install.
> Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC
> each I will have to create three strings each 480v. What would be the best
> choice for a home run wire? I’ve always used smaller strings with micro
> inverters, a combiner at the array and a single Teck home run cable but the
> string inverter presents a different scenario and it looks like I’ll need
> to use three home run cables, one for each string.
>
> Ron Young
>
> earthRight Products - Solareagle.com
> Alternative Energy Solutions ~ Renewable Energy Products
>
>
> ___
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
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> There are two list archives for searching. When one doesn't work, try the
> other:
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>
> List rules & etiquette:
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>
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Re: [RE-wrenches] Sol-Ark install

[Kirk Herander via RE-wrenches]

I feel the same way about the Outback Radian GSLC box, once it's fully
wired there's no room whatsoever, and sometimes you have to remove
breakers and layers of wiring to re-access things for debug. Don't know how
it meets code and ETL approval  for wire space.

On Thu, Apr 14, 2022 at 11:20 AM Jason Szumlanski via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> This problem is not limited to one manufacturer. One example is the
> Enphase smart controller. While the small holes are big enough for #6
> ground and neutral, you have to strip the wires perfectly and have the hand
> of a heart surgeon to get them in there. And conduit entry is a royal pain
> because the enclosure is tapered on the bottom and sides.
>
> Fortunately, all of these manufacturers seem to be making strides to make
> the roof installation easier. A little more attention to the electrical
> enclosures would be appreciated.
>
> Jason Szumlanski
>
>
>
> On Thu, Apr 14, 2022, 10:30 AM Dana Orzel via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
>> We have done one Solark installation & I was shocked as to the lack of
>> ground wire landing terminals & space. We added a 12126 metal box below to
>> ease the # of entrances to two 11/4”.
>>  I jumpered a # 8 to a second ground bar to allow for additional landing
>> locations. I called Solark to question this & the response to the question
>> was “yeah we have heard this from other installers “.
>> End of call.
>> Dana Orzel
>> C: 208.721.7003
>> E- d...@solarwork.com
>>
>> On Apr 13, 2022, at 8:21 PM, Maverick Brown via RE-wrenches <
>> re-wrenches@lists.re-wrenches.org> wrote:
>>
>> Ron
>>
>> The Sol-Ark has two MPPT channels and has two separate landing spots for
>> each MPPT channels. Each landing pair needs matching strings. 8 AWG wire
>> barely fits so the Sol-Ark PV terminals so they may only be rated for
>> 10AWG.
>>
>> I’m assuming you have a ground array  The most common stringing method
>> would be to use a trench with conduit and THHN wire. You could also sleeve
>> a direct-burial cable into the ground.  Calculate the voltage drop over the
>> distance to make sure 10AWG is adequate. If not, then make a junction, like
>> a MidNite or Outback combiner or an IMO switch at the array to get up the
>> right wire size, with an added MidNite Surge Protector or EMP shield
>> device. If it’s a long distance (larger wire size), add another combiner at
>> the inverter building entrance to get back to 10 AWG.
>>
>> https://practicalpreppers.com/product/imo-4-pole-16-amp-dc-disconnect/
>>
>> Also, The Sol-Ark sizing guide helps with string calculations.
>>
>> https://www.sol-ark.com/solar-panel-sizing/SolarPanelSizing.html
>>
>> Contact me off list with additional questions.
>>
>>
>>
>> Maverick Brown
>> Off-Grid Solar Commander since 2006
>> *Maverick Solar Enterprises, Inc.*
>> * • Solar Commander Remote Power*
>>
>> * • SunFlow Systems Cathodic Protection *maver...@mavericksolar.com
>> 512-460-9825
>>
>>
>> On Apr 12, 2022, at 9:42 PM, Ron Young via RE-wrenches <
>> re-wrenches@lists.re-wrenches.org> wrote:
>>
>> Hi Wrenches, trying to wrap my head around a first time Sol-Ark install.
>> Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC
>> each I will have to create three strings each 480v. What would be the best
>> choice for a home run wire? I’ve always used smaller strings with micro
>> inverters, a combiner at the array and a single Teck home run cable but the
>> string inverter presents a different scenario and it looks like I’ll need
>> to use three home run cables, one for each string.
>>
>> Ron Young
>>
>> earthRight Products - Solareagle.com
>> Alternative Energy Solutions ~ Renewable Energy Products
>>
>>
>> ___
>> List sponsored by Redwood Alliance
>>
>> Pay optional member dues here: http://re-wrenches.org
>>
>> List Address: RE-wrenches@lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> There are two list archives for searching. When one doesn't work, try the
>> other:
>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>
>> List rules & etiquette:
>> http://www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> http://www.members.re-wrenches.org
>>
>> ___
>> List sponsored by Redwood Alliance
>>
>> Pay optional member dues here: http://re-wrenches.org
>>
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>>
>> Change listserver email address & settings:
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>>
>> There are two list archives for searching. When one doesn't work, try the
>> other:
>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
>> 

Re: [RE-wrenches] Sol-Ark install

[Jason Szumlanski via RE-wrenches]

This problem is not limited to one manufacturer. One example is the Enphase
smart controller. While the small holes are big enough for #6 ground and
neutral, you have to strip the wires perfectly and have the hand of a heart
surgeon to get them in there. And conduit entry is a royal pain because the
enclosure is tapered on the bottom and sides.

Fortunately, all of these manufacturers seem to be making strides to make
the roof installation easier. A little more attention to the electrical
enclosures would be appreciated.

Jason Szumlanski



On Thu, Apr 14, 2022, 10:30 AM Dana Orzel via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> We have done one Solark installation & I was shocked as to the lack of
> ground wire landing terminals & space. We added a 12126 metal box below to
> ease the # of entrances to two 11/4”.
>  I jumpered a # 8 to a second ground bar to allow for additional landing
> locations. I called Solark to question this & the response to the question
> was “yeah we have heard this from other installers “.
> End of call.
> Dana Orzel
> C: 208.721.7003
> E- d...@solarwork.com
>
> On Apr 13, 2022, at 8:21 PM, Maverick Brown via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
> Ron
>
> The Sol-Ark has two MPPT channels and has two separate landing spots for
> each MPPT channels. Each landing pair needs matching strings. 8 AWG wire
> barely fits so the Sol-Ark PV terminals so they may only be rated for
> 10AWG.
>
> I’m assuming you have a ground array  The most common stringing method
> would be to use a trench with conduit and THHN wire. You could also sleeve
> a direct-burial cable into the ground.  Calculate the voltage drop over the
> distance to make sure 10AWG is adequate. If not, then make a junction, like
> a MidNite or Outback combiner or an IMO switch at the array to get up the
> right wire size, with an added MidNite Surge Protector or EMP shield
> device. If it’s a long distance (larger wire size), add another combiner at
> the inverter building entrance to get back to 10 AWG.
>
> https://practicalpreppers.com/product/imo-4-pole-16-amp-dc-disconnect/
>
> Also, The Sol-Ark sizing guide helps with string calculations.
>
> https://www.sol-ark.com/solar-panel-sizing/SolarPanelSizing.html
>
> Contact me off list with additional questions.
>
>
>
> Maverick Brown
> Off-Grid Solar Commander since 2006
> *Maverick Solar Enterprises, Inc.*
> * • Solar Commander Remote Power*
>
> * • SunFlow Systems Cathodic Protection *maver...@mavericksolar.com
> 512-460-9825
>
>
> On Apr 12, 2022, at 9:42 PM, Ron Young via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
> Hi Wrenches, trying to wrap my head around a first time Sol-Ark install.
> Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC
> each I will have to create three strings each 480v. What would be the best
> choice for a home run wire? I’ve always used smaller strings with micro
> inverters, a combiner at the array and a single Teck home run cable but the
> string inverter presents a different scenario and it looks like I’ll need
> to use three home run cables, one for each string.
>
> Ron Young
>
> earthRight Products - Solareagle.com
> Alternative Energy Solutions ~ Renewable Energy Products
>
>
> ___
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> There are two list archives for searching. When one doesn't work, try the
> other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
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[RE-wrenches] Sol-Ark install

[Dana Orzel via RE-wrenches]

We have done one Solark installation & I was shocked as to the lack of ground 
wire landing terminals & space. We added a 12126 metal box below to ease the # 
of entrances to two 11/4”.
 I jumpered a # 8 to a second ground bar to allow for additional landing 
locations. I called Solark to question this & the response to the question was 
“yeah we have heard this from other installers “.
End of call. 
Dana Orzel
C: 208.721.7003
E- d...@solarwork.com

> On Apr 13, 2022, at 8:21 PM, Maverick Brown via RE-wrenches 
>  wrote:
> 
> Ron
> 
> The Sol-Ark has two MPPT channels and has two separate landing spots for each 
> MPPT channels. Each landing pair needs matching strings. 8 AWG wire barely 
> fits so the Sol-Ark PV terminals so they may only be rated for 10AWG. 
> 
> I’m assuming you have a ground array  The most common stringing method would 
> be to use a trench with conduit and THHN wire. You could also sleeve a 
> direct-burial cable into the ground.  Calculate the voltage drop over the 
> distance to make sure 10AWG is adequate. If not, then make a junction, like a 
> MidNite or Outback combiner or an IMO switch at the array to get up the right 
> wire size, with an added MidNite Surge Protector or EMP shield device. If 
> it’s a long distance (larger wire size), add another combiner at the inverter 
> building entrance to get back to 10 AWG. 
> 
> https://practicalpreppers.com/product/imo-4-pole-16-amp-dc-disconnect/
> 
> Also, The Sol-Ark sizing guide helps with string calculations. 
> 
> https://www.sol-ark.com/solar-panel-sizing/SolarPanelSizing.html
> 
> Contact me off list with additional questions. 
> 
> 
> 
> Maverick Brown
> Off-Grid Solar Commander since 2006
> Maverick Solar Enterprises, Inc.
>  • Solar Commander Remote Power
>  • SunFlow Systems Cathodic Protection 
> maver...@mavericksolar.com
> 512-460-9825
> 
> 
>>> On Apr 12, 2022, at 9:42 PM, Ron Young via RE-wrenches 
>>>  wrote:
>>> 
>> Hi Wrenches, trying to wrap my head around a first time Sol-Ark install. 
>> Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC 
>> each I will have to create three strings each 480v. What would be the best 
>> choice for a home run wire? I’ve always used smaller strings with micro 
>> inverters, a combiner at the array and a single Teck home run cable but the 
>> string inverter presents a different scenario and it looks like I’ll need to 
>> use three home run cables, one for each string. 
>> 
>> Ron Young
>> 
>> earthRight Products - Solareagle.com
>> Alternative Energy Solutions ~ Renewable Energy Products
>> 
>> 
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Re: [RE-wrenches] Sol-Ark install

[Maverick Brown via RE-wrenches]

Ron

The Sol-Ark has two MPPT channels and has two separate landing spots for each 
MPPT channels. Each landing pair needs matching strings. 8 AWG wire barely fits 
so the Sol-Ark PV terminals so they may only be rated for 10AWG. 

I’m assuming you have a ground array  The most common stringing method would be 
to use a trench with conduit and THHN wire. You could also sleeve a 
direct-burial cable into the ground.  Calculate the voltage drop over the 
distance to make sure 10AWG is adequate. If not, then make a junction, like a 
MidNite or Outback combiner or an IMO switch at the array to get up the right 
wire size, with an added MidNite Surge Protector or EMP shield device. If it’s 
a long distance (larger wire size), add another combiner at the inverter 
building entrance to get back to 10 AWG. 

https://practicalpreppers.com/product/imo-4-pole-16-amp-dc-disconnect/

Also, The Sol-Ark sizing guide helps with string calculations. 

https://www.sol-ark.com/solar-panel-sizing/SolarPanelSizing.html

Contact me off list with additional questions. 



Maverick Brown
Off-Grid Solar Commander since 2006
Maverick Solar Enterprises, Inc.
 • Solar Commander Remote Power
 • SunFlow Systems Cathodic Protection 
maver...@mavericksolar.com
512-460-9825


> On Apr 12, 2022, at 9:42 PM, Ron Young via RE-wrenches 
>  wrote:
> 
> Hi Wrenches, trying to wrap my head around a first time Sol-Ark install. 
> Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC 
> each I will have to create three strings each 480v. What would be the best 
> choice for a home run wire? I’ve always used smaller strings with micro 
> inverters, a combiner at the array and a single Teck home run cable but the 
> string inverter presents a different scenario and it looks like I’ll need to 
> use three home run cables, one for each string. 
> 
> Ron Young
> 
> earthRight Products - Solareagle.com
> Alternative Energy Solutions ~ Renewable Energy Products
> 
> 
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Re: [RE-wrenches] Sol-Ark install (Admin Post)

[Michael Welch via RE-wrenches]

Hi gang, let's take any further discussion of Wrench List qualifications 
off-list, please email me directly with any questions or concerns.

First, this is not a NABCEP-only list. If I had to guess, less than half of you 
have pro installer certifications. In fact, this list predates NABCEP and was 
helpful in the creation of NABCEP.  There are plenty of solid installers who 
for whatever reasons have decided not to seek NABCEP certification. 

NABCEP PVIP certification IS an automatic qualification for this list, no 
questions asked. But for list applicants who aren't PVIP certified, I go by 
their stated experience. If I have any reason to doubt that experience, or it 
is on the edge, I have a long list of questions to help me determine pro status 
and experience.

These are things I feel are necessary to keep the level of discussion fairly 
high.

FYI, Ron has been active in this list since 2006, and qualified for the list 
based on his experience installing off-grid systems in British Columbia. 

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Re: [RE-wrenches] Sol-Ark install

[Mac Lewis via RE-wrenches]

Hello Ron,

I'll try to point you in the right direction here, but yes you want to move
forward cautiously.  Good training is easily available all over the place
now.  I will say that you can be an excellent and successful solar
installer these days without any experience with string inverters like
this.  MLPE has made this possible recently.

If this is on the roof, and you are on a 2014 NEC code or later, you will
need some type of module level or string level rapid shutdown device.  Tigo
seems to work well with the Sol-Ark built in RSS system.

As far as stringing, you need to apply your local climate's cold factor to
the Voc of the string, or use the module nameplate to figure out the true
Voc of each string and stay below the MPPT limit for Voc.  If you haven't
done this before, I would take a class. You can use Sol-Arks string
calculator here:
https://www.sol-ark.com/solar-panel-sizing/SolarPanelSizing.html

I always check any calculator's output by hand and verify that the Voc goes
up as temperature goes down.  This step should not be overlooked because
you can damage the MPPTs input.  The cold temp factor here in Colorado can
drive the Voc to 25% above the nameplate ratings, so don't ignore this.

Once you have your maximum string length, you want to figure out how to
wire this in as efficiently as possible.  You can combine 2 strings per
MPPT typically, but these parallel strings need to be the same number of
modules.  You also want the strings to face ~ same direction and have
similar shading characteristics for the most efficient operation over time.

Be careful and good luck!

On Wed, Apr 13, 2022 at 5:29 AM Scot Arey via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> I agree with an earlier response…isn’t this a NABCEP PV Installation
> Professional-only forum?  The original question is DC-string design 101.
> Jerry is spot on for coldest temp adjustments, RSD considerations if
> required. But selecting a home run wire for separate string inputs to the
> inverter??? How can this be asked here?
>
> Ron, are you NABCEP PV Installation Pro certified?
>
>
>
> Scot Arey
>
> Owner, Solar CenTex
>
>
>
> *From:* RE-wrenches  *On
> Behalf Of *Jerry Shafer via RE-wrenches
> *Sent:* Tuesday, April 12, 2022 10:27 PM
> *To:* RE-wrenches 
> *Cc:* Jerry Shafer 
> *Subject:* Re: [RE-wrenches] Sol-Ark install
>
>
>
> Need more than this, we have amperage, we need distance, temp, # of wires
> per conduit, also at 480 you may want to verify cold temp for over the top
> voltage @ VOC, any RSD device(s) being used? Help to have total module
> count, as an example use a combiner to make 4 strings, 2 of equal voltage
> per input. For battery backup or off grid, Solark is the easiest you will
> get.
>
> Jerry
>
>  NABCEP PV Inspector
>
>
>
> On Tue, Apr 12, 2022, 7:42 PM Ron Young via RE-wrenches <
> re-wrenches@lists.re-wrenches.org> wrote:
>
> Hi Wrenches, trying to wrap my head around a first time Sol-Ark install.
> Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC
> each I will have to create three strings each 480v. What would be the best
> choice for a home run wire? I’ve always used smaller strings with micro
> inverters, a combiner at the array and a single Teck home run cable but the
> string inverter presents a different scenario and it looks like I’ll need
> to use three home run cables, one for each string.
>
>
>
> Ron Young
>
>
>
> earthRight Products - Solareagle.com
> Alternative Energy Solutions ~ Renewable Energy Products
>
> ___
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Re: [RE-wrenches] Sol-Ark install

[Scot Arey via RE-wrenches]

I agree with an earlier response…isn’t this a NABCEP PV Installation 
Professional-only forum?  The original question is DC-string design 101. Jerry 
is spot on for coldest temp adjustments, RSD considerations if required. But 
selecting a home run wire for separate string inputs to the inverter??? How can 
this be asked here?

Ron, are you NABCEP PV Installation Pro certified?

 

Scot Arey

Owner, Solar CenTex



 

From: RE-wrenches  On Behalf Of 
Jerry Shafer via RE-wrenches
Sent: Tuesday, April 12, 2022 10:27 PM
To: RE-wrenches 
Cc: Jerry Shafer 
Subject: Re: [RE-wrenches] Sol-Ark install

 

Need more than this, we have amperage, we need distance, temp, # of wires per 
conduit, also at 480 you may want to verify cold temp for over the top voltage 
@ VOC, any RSD device(s) being used? Help to have total module count, as an 
example use a combiner to make 4 strings, 2 of equal voltage per input. For 
battery backup or off grid, Solark is the easiest you will get. 

Jerry

 NABCEP PV Inspector 

 

On Tue, Apr 12, 2022, 7:42 PM Ron Young via RE-wrenches 
mailto:re-wrenches@lists.re-wrenches.org> > 
wrote:

Hi Wrenches, trying to wrap my head around a first time Sol-Ark install. 
Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC each 
I will have to create three strings each 480v. What would be the best choice 
for a home run wire? I’ve always used smaller strings with micro inverters, a 
combiner at the array and a single Teck home run cable but the string inverter 
presents a different scenario and it looks like I’ll need to use three home run 
cables, one for each string. 

 

Ron Young

 

earthRight Products - Solareagle.com <http://Solareagle.com> 
Alternative Energy Solutions ~ Renewable Energy Products



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Re: [RE-wrenches] Sol-Ark install

[William Miller via RE-wrenches]

Ron:



I apologize if I am underestimating your level of skill or experience.
Feel free to correct me if I am wrong.  However from the extent of the
questions you are asking, it seems like some solar design and vocational
courses might be in order.  Without a solid background, no one should be
designing and installing electrical systems with any voltages greater than
50, AC or DC.



Below is my take on the subject of training.  I apologize if I am on a bit
of a rant, but I feel the subject gets overlooked.



When I started in solar there were no training resources.  As time passed a
few became available:  I took one of Bill Brooks’ early 3 day courses in
Sacramento.  I went to a very bizarre lecture that John Wiles presented.
There was an outfit called High Sun Engineering that had a multi-day
course.



I also went to every inverter manufacturer’s 1-3 day course I could find
including Outback’s factory certification course.  I went to every trade
show I could get to.  I read every manual and I kept the all of the solar
equipment manufacturer’s tech support numbers on speed dial.  All of these
are still valid methods to improve your knowledge.



There are now many good training options.  Community colleges offer
courses.  I never pursued the NABCEP training because there was never a job
I failed to get or complete due to lack of that certification.  I have
reviewed the NABCEP training material and the curriculum seems very
thorough.



The industry is much more complicated now than it was in the mid-80s-- If
back then someone had tried to explain AC coupling to me it would have
blown my mind, as just one example.  Further complicating the
solar-electric industry is the evolution of the NEC, the rigors of
permitting and improved safety protocols that have to be followed.
Training is more important now than ever.



Here is another concept that I think applies to this mini-rant:  Before one
can become a skilled solar electrician one must first become a competent
electrician.  You need to know electrical theory, electrical and building
codes, the hardware, practices and construction in general, particularly
roofing.  To become a solar designer, you have to have expertise in the
above trades and have additional skills in math, spreadsheets, research and
CAD.



Here is an option for those interested in getting started in the solar
electric trade:  Before I got my contractor’s license I worked with a buddy
that was licensed.  I already had a few years as an apprentice and I had
electronics training and experience.  I brought the customers and the
designs.  My pal supervised the work and put his name on the permits.
Eventually he signed for my hours and I got my own license.



The bottom line is: I could not in good conscious coach someone on how to
design any electrical system if I were not confident they were experienced
enough to install the resulting system safely.  The overriding principal is
simple enough: electrical systems, when installed improperly, can kill.



I mean no disrespect…



William Miller



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
Behalf Of *Ron Young via RE-wrenches
*Sent:* Tuesday, April 12, 2022 7:42 PM
*To:* RE-wrenches
*Cc:* Ron Young
*Subject:* [RE-wrenches] Sol-Ark install



Hi Wrenches, trying to wrap my head around a first time Sol-Ark install.
Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC
each I will have to create three strings each 480v. What would be the best
choice for a home run wire? I’ve always used smaller strings with micro
inverters, a combiner at the array and a single Teck home run cable but the
string inverter presents a different scenario and it looks like I’ll need
to use three home run cables, one for each string.



Ron Young



earthRight Products - Solareagle.com
Alternative Energy Solutions ~ Renewable Energy Products
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Re: [RE-wrenches] Sol-Ark install

[Jerry Shafer via RE-wrenches]

Need more than this, we have amperage, we need distance, temp, # of wires
per conduit, also at 480 you may want to verify cold temp for over the top
voltage @ VOC, any RSD device(s) being used? Help to have total module
count, as an example use a combiner to make 4 strings, 2 of equal voltage
per input. For battery backup or off grid, Solark is the easiest you will
get.
Jerry
 NABCEP PV Inspector

On Tue, Apr 12, 2022, 7:42 PM Ron Young via RE-wrenches <
re-wrenches@lists.re-wrenches.org> wrote:

> Hi Wrenches, trying to wrap my head around a first time Sol-Ark install.
> Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC
> each I will have to create three strings each 480v. What would be the best
> choice for a home run wire? I’ve always used smaller strings with micro
> inverters, a combiner at the array and a single Teck home run cable but the
> string inverter presents a different scenario and it looks like I’ll need
> to use three home run cables, one for each string.
>
> Ron Young
>
> earthRight Products - Solareagle.com
> Alternative Energy Solutions ~ Renewable Energy Products
>
>
> ___
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[RE-wrenches] Sol-Ark install

[Ron Young via RE-wrenches]

Hi Wrenches, trying to wrap my head around a first time Sol-Ark install. 
Because the max DC voltage is 500v at 18a  and the PV I’m using is 40v DC each 
I will have to create three strings each 480v. What would be the best choice 
for a home run wire? I’ve always used smaller strings with micro inverters, a 
combiner at the array and a single Teck home run cable but the string inverter 
presents a different scenario and it looks like I’ll need to use three home run 
cables, one for each string. 

Ron Young

earthRight Products - Solareagle.com
Alternative Energy Solutions ~ Renewable Energy Products


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