Re: [RE-wrenches] Mounting height

[Dave Click]

I believe that I was told in a 2005-ish Xantrex GT training that their 
minimum clearance (~30") requirement came from the need to be above lawn 
sprinklers. I can't remember offhand seeing this reason given in any 
recent manual, so any bottom clearances required in the manual may apply 
to you even if you're inside.



On 2014/10/23 0:59, frenergy wrote:

Bob-O, Peter, Garrison,
I appreciate the responses, will proceed accordingly.  I have 
seen some references to minimum distance to floor in some manuals.  
Thank you,

Bill
Feather River Solar Electric

- Original Message -
*From:* Garrison Riegel 
*To:* 'RE-wrenches' 
*Sent:* Wednesday, October 22, 2014 11:11 AM
*Subject:* Re: [RE-wrenches] Mounting height

Bill,

See 2011 NEC 690.14(D) or 2014 NEC 690.15(A) Utility-Interactive
Inverters Mounted in Not Readily Accessible Locations. Basically
there is no maximum height restriction for inverters but there are
a number of requirements for AC and DC disconnecting means.  See
NEC 404.8 for maximum disconnect height of 6’ 7”…although
exception No. 2 may allow the disconnect to be accessible by
portable means.  I don’t know of any minimum height requirements
in the code, although most (all?) string and microinverter
manufacturers specify a required clearance below the inverter.  I
suppose that would be the minimum.

Garrison

Garrison Riegel

Project Manager | /Solar Service Inc/


[p] 847-677-0950 | garri...@solarserviceinc.com


NABCEP Certified PV Installation Professional™

*From:*RE-wrenches
[mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of
*frenergy
*Sent:* Tuesday, October 21, 2014 11:02 PM
*To:* RE-wrenches
*Subject:* [RE-wrenches] Mounting height

Wrenches,

I can't seem to find a reference to the heights allowable
for inverter installs, either minimum or maximum (need both).  For
that matter, AC combiners, DC discos, any switchgear related to
the inverter(s).

Any help appreciated.

Bill

Feather River Solar Electric

solar powered since 1982


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Re: [RE-wrenches] Mounting height

[Jarmo . Venalainen]

Hi:

Prior to my current role in training I was working in product development. 
 Regarding minimum mounting clearances, inverter manufacturers are 
required to test their equipment so that no component inside goes above 
its rated temperature during normal operation at a specified ambient 
temperature.  At temperatures above that the unit must behave in ways 
which maintains the internal temperatures of all components within their 
spec, (typically the inverter derates).

The test for what gets published is done in a set-up where there are walls 
on both sides, top and bottom, but the very front surface of the enclosure 
is left open at a distance of 36" as shown in the diagram below.



As a rule of thumb when comparing inverter specs, looking at the minimum 
clearances and specified normal ambient temperature will give you a good 
indication of how well the unit dissipates heat.  If the manufacturer 
specifies very tight clearances at a higher ambient temp, then you know 
that the device is able to dissipate heat well and will in fact run cooler 
if given more room to breathe.

As inverter manufacturers we don't, (and really cant), stay abreast of all 
the installation codes which apply in the US and throughout the rest of 
the world.  What we do is to try to make sure the our bottom clearance 
minimum is less than what is allowed in the codes.

JARMO

_
 


Jarmo Venalainen  |   Schneider Electric   |  Solar Business  |   CANADA | 
  Training & Development Specialist - Senior 
Phone: +604-422-2528  |   Fax: +604-420-1591  |   Mobile: +604-505-0291 
Email: jarmo.venalai...@schneider-electric.com  |   Site: www.SEsolar.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 


*** Please consider the environment before printing this e-mail 




From:
Dave Click 
To:
re-wrenches@lists.re-wrenches.org, 
Date:
10/23/2014 09:45 AM
Subject:
Re: [RE-wrenches] Mounting height
Sent by:
"RE-wrenches" 



I believe that I was told in a 2005-ish Xantrex GT training that their 
minimum clearance (~30") requirement came from the need to be above lawn 
sprinklers. I can't remember offhand seeing this reason given in any 
recent manual, so any bottom clearances required in the manual may apply 
to you even if you're inside.


On 2014/10/23 0:59, frenergy wrote:
Bob-O, Peter, Garrison,
 
I appreciate the responses, will proceed accordingly.  I have seen 
some references to minimum distance to floor in some manuals.  Thank you,
 
Bill
Feather River Solar Electric
 
- Original Message - 
From: Garrison Riegel 
To: 'RE-wrenches' 
Sent: Wednesday, October 22, 2014 11:11 AM
Subject: Re: [RE-wrenches] Mounting height

Bill,
 
See 2011 NEC 690.14(D) or 2014 NEC 690.15(A) Utility-Interactive Inverters 
Mounted in Not Readily Accessible Locations.  Basically there is no 
maximum height restriction for inverters but there are a number of 
requirements for AC and DC disconnecting means.  See NEC 404.8 for maximum 
disconnect height of 6’ 7”…although exception No. 2 may allow the 
disconnect to be accessible by portable means.  I don’t know of any 
minimum height requirements in the code, although most (all?) string and 
microinverter manufacturers specify a required clearance below the 
inverter.  I suppose that would be the minimum. 
 
Garrison   
 
Garrison Riegel
Project Manager | Solar Service Inc
[p] 847-677-0950 | garri...@solarserviceinc.com
 
NABCEP Certified PV Installation Professional™
 
 
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On 
Behalf Of frenergy
Sent: Tuesday, October 21, 2014 11:02 PM
To: RE-wrenches
Subject: [RE-wrenches] Mounting height
 
Wrenches,
 
I can't seem to find a reference to the heights allowable for 
inverter installs, either minimum or maximum (need both).  For that 
matter, AC combiners, DC discos, any switchgear related to the 
inverter(s).
 
Any help appreciated.
 
Bill
Feather River Solar Electric
solar powered since 1982
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Re: [RE-wrenches] Mitsubishi Mini Split fighting with Outback VFX Off Grid

[Drake]

Your inverter specification was an Outback VFX7248. Is this a stacked 
pair of 3648s? Are they stacked parallel or series?


At 10:54 AM 10/21/2014, you wrote:
Anyone else had issues with Mitsubishi Mini Split heat pumps 
fighting with Outback VFX off grid inverters? Everything is brand 
new. Outback VFX7248, three separate heat pumps. The heat pumps shut 
down reporting multiple / confusing input commands. The heat pump 
guys want to blame the power system. I'm thinking bad Sushi. Thanks db



Dan Brown
Foxfire Energy Corp.
Renewable Energy Systems
(802)-483-2564
www.Foxfire-Energy.com
NABCEP #092907-44
[]


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[RE-wrenches] "PV wire"

[Marco Mangelsdorf]

Yet again this "PV wire" thing rears its head.

 

For our PV systems using transformerless (TL) inverters, our standard
practice has been to use double-insulated conductors for all DC circuits
coming into the TL inverter(s), which we believe represents the best
practice.

 

However, there doesn't appear to be any requirement stated in the code that
states the need to use double-insulated conductors for DC circuits and TL
inverters.

 

So I'm thinking, why pay the extra expense for the double-insulated wire
when single-insulated wire may suffice.

 

Anyone know of anything written somewhere that requires the use of
double-insulated conductors in TL DC circuits?

 

Thanks,

marco

 

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Re: [RE-wrenches] "PV wire"

[August Goers]

Marco,

For a standard 600 volt non-isolated (transformerless) inverter based
systems, you just need to make sure that your array source circuit
conductors have a "photovoltaic or PV wire" rating. You can also switch to
standard THWN-2 once you get into conduit.

This Solar Pro article might help:

http://solarprofessional.com/articles/design-installation/ungrounded-pv-power-systems-in-the-nec/page/0/9

Best,

August

*August Goers*

Luminalt Energy Corporation

o: 415.641.4000

m: 415.559.1525

www.luminalt.com



On Thu, Oct 23, 2014 at 2:29 PM, Marco Mangelsdorf 
wrote:

>  Yet again this “PV wire” thing rears its head.
>
>
>
> For our PV systems using transformerless (TL) inverters, our standard
> practice has been to use double-insulated conductors for all DC circuits
> coming into the TL inverter(s), which we believe represents the best
> practice.
>
>
>
> However, there doesn’t appear to be any requirement stated in the code
> that states the need to use double-insulated conductors for DC circuits and
> TL inverters.
>
>
>
> So I’m thinking, why pay the extra expense for the double-insulated wire
> when single-insulated wire may suffice.
>
>
>
> Anyone know of anything written somewhere that requires the use of
> double-insulated conductors in TL DC circuits?
>
>
>
> Thanks,
>
> marco
>
>
>
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Re: [RE-wrenches] "PV wire"

[jay peltz]

HI Marco

I think there has been a lot of bad/old information about PV vs double 
insulated wire.
However now it only listed as PV wire.

690.35 D (3)

jay

peltz power


On Oct 23, 2014, at 2:29 PM, Marco Mangelsdorf wrote:

> Yet again this “PV wire” thing rears its head.
>  
> For our PV systems using transformerless (TL) inverters, our standard 
> practice has been to use double-insulated conductors for all DC circuits 
> coming into the TL inverter(s), which we believe represents the best practice.
>  
> However, there doesn’t appear to be any requirement stated in the code that 
> states the need to use double-insulated conductors for DC circuits and TL 
> inverters.
>  
> So I’m thinking, why pay the extra expense for the double-insulated wire when 
> single-insulated wire may suffice.
>  
> Anyone know of anything written somewhere that requires the use of 
> double-insulated conductors in TL DC circuits?
>  
> Thanks,
> marco
>  

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[RE-wrenches] magnum question

[jay peltz]

HI All,

Does anyone have a person at Magnum in engineering or higher up than tech 
support.

I've got a problem with an inverter that tech support won't or can't help with.

thanks

jay

peltz power
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