Re: [RE-wrenches] Dream system.

[John]

As well as all those other good ideas, don’t forget to teach energy 
efficiency/energy savings methods.   

 

Quote from Homepower,  “It is easier to save a watt than it is to create one”   
  cheers,John V.

 

From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of Solar
Sent: Saturday, 1 August 2015 12:55 p.m.
To: RE-wrenches
Subject: Re: [RE-wrenches] Dream system.

 

All great ideas!! 

 

We do have S-5 both for racking and the PV kit. To Great point we do cover 
efficiency, passive solar, load shifting... We do have internships with install 
companies and the utilities. We have 5 different racking types and one ballast 
mount for hands on work. We have 4 on campus systems all with different 
monitoring (Tigo, enphase, egauge and SMA) while working on the mock roof we do 
tie off and observe a safety procedure. We also cover OSHA regs as part of 
class and the students get OSHA 10. 

 

The battery ideas are good too. LION and such are needed for sure along with 
monitoring for those systems. I just did my first solaredge system and I agree 
that is a must. 

 

We also need some design software. We have the pathfinder and solmetric 
software we use in class and we use PVwatts and those similar to that. 

 

Much appreciated. I hope to build lab that covers as much as possible for use 
with students and our continuing ed  electrical programs. 

 

Jesse

 

Sent from my iPhone


On Jul 31, 2015, at 5:57 PM, Glenn Burt  wrote:

I would suggest a Solar Edge inverter system, some lithium batteries, an Aqueon 
battery system, a variety of safety equipment and trying to partner with a 
local installation firm for site visits, and possibly hands on work.

Sincerely,
Glenn Burt
Sent from my 'smart' phone so please excuse grammar and typos.

  _  

From: Solar  
Sent: ‎7/‎31/‎2015 17:05
To: Wrenches  
Subject: [RE-wrenches] Dream system.

Hello all,

I was recently hired to be the full time electrical instructor at a local 
community college. In the second year of the class there is a 6 credit 
"renewable energy and habitat house" course. I have been teaching at this 
college as an adjunct instructor since 2009 teaching for 3 of the 7 local iron 
ore mines,the local paper mill as well as doing most of the NEC code update 
courses. During that time I ran a one year and a 6 month solar PV course. I 
have a fairly nice lab built for the PV course consisting of the following:

2 axis tracker 
Fixed tilt pole mount 
20'x16' mock roof with shingles and metal roofing 
Enphase systems 
(3) 700W SMA inverters
Outback setup
Xantrax 600v 80A charge controller 
Magnum 4024 inverter (AC coupled goal with this) 
Tigos
300W Morningstar on a demo cart
Couple Solectria inverter (not used much)
Trace 4024 (purchased in 99)
Trace DR 1524 that goes along with our 1Kw Bergy 
Multiple battery brands and types AGM and flooded 
Pathfinders
Suneye (2 210s)
600V Solmetric PVA
Racking, quickmounts standoffs, clamps nuts and bolts...


Modules include: 90W sunwize, Solarwolrd 175, REC 215W, silicon energy 190W, 
kyocera 210W, solar frontier 100W (I think 100W) AEE 95W, Dasol 15, 30, 135w. 

Assuming I stay with this job for the next 25 years, which will take me into my 
early 60s and my goal, I will have a yearly budget to spend adding to this lab. 

Here is the question, seeing what we have now what individual pieces would you 
add or what system would you build with the goal of community education or 
training electrical students and electricians. 

Long winded but I am very interested to hear your ideas!

Have a good weekend and thanks!

Jesse



Sent from my iPhone
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Re: [RE-wrenches] Dream system.

[Solar]

All great ideas!! 

We do have S-5 both for racking and the PV kit. To Great point we do cover 
efficiency, passive solar, load shifting... We do have internships with install 
companies and the utilities. We have 5 different racking types and one ballast 
mount for hands on work. We have 4 on campus systems all with different 
monitoring (Tigo, enphase, egauge and SMA) while working on the mock roof we do 
tie off and observe a safety procedure. We also cover OSHA regs as part of 
class and the students get OSHA 10. 

The battery ideas are good too. LION and such are needed for sure along with 
monitoring for those systems. I just did my first solaredge system and I agree 
that is a must. 

We also need some design software. We have the pathfinder and solmetric 
software we use in class and we use PVwatts and those similar to that. 

Much appreciated. I hope to build lab that covers as much as possible for use 
with students and our continuing ed  electrical programs. 

Jesse

Sent from my iPhone

> On Jul 31, 2015, at 5:57 PM, Glenn Burt  wrote:
> 
> I would suggest a Solar Edge inverter system, some lithium batteries, an 
> Aqueon battery system, a variety of safety equipment and trying to partner 
> with a local installation firm for site visits, and possibly hands on work.
> 
> Sincerely,
> Glenn Burt
> Sent from my 'smart' phone so please excuse grammar and typos.
> From: Solar
> Sent: ‎7/‎31/‎2015 17:05
> To: Wrenches
> Subject: [RE-wrenches] Dream system.
> 
> Hello all,
> 
> I was recently hired to be the full time electrical instructor at a local 
> community college. In the second year of the class there is a 6 credit 
> "renewable energy and habitat house" course. I have been teaching at this 
> college as an adjunct instructor since 2009 teaching for 3 of the 7 local 
> iron ore mines,the local paper mill as well as doing most of the NEC code 
> update courses. During that time I ran a one year and a 6 month solar PV 
> course. I have a fairly nice lab built for the PV course consisting of the 
> following:
> 
> 2 axis tracker 
> Fixed tilt pole mount 
> 20'x16' mock roof with shingles and metal roofing 
> Enphase systems 
> (3) 700W SMA inverters
> Outback setup
> Xantrax 600v 80A charge controller 
> Magnum 4024 inverter (AC coupled goal with this) 
> Tigos
> 300W Morningstar on a demo cart
> Couple Solectria inverter (not used much)
> Trace 4024 (purchased in 99)
> Trace DR 1524 that goes along with our 1Kw Bergy 
> Multiple battery brands and types AGM and flooded 
> Pathfinders
> Suneye (2 210s)
> 600V Solmetric PVA
> Racking, quickmounts standoffs, clamps nuts and bolts...
> 
> 
> Modules include: 90W sunwize, Solarwolrd 175, REC 215W, silicon energy 190W, 
> kyocera 210W, solar frontier 100W (I think 100W) AEE 95W, Dasol 15, 30, 135w. 
> 
> Assuming I stay with this job for the next 25 years, which will take me into 
> my early 60s and my goal, I will have a yearly budget to spend adding to this 
> lab. 
> 
> Here is the question, seeing what we have now what individual pieces would 
> you add or what system would you build with the goal of community education 
> or training electrical students and electricians. 
> 
> Long winded but I am very interested to hear your ideas!
> 
> Have a good weekend and thanks!
> 
> Jesse
> 
> 
> 
> Sent from my iPhone
> ___
> List sponsored by Redwood Alliance
> 
> List Address: RE-wrenches@lists.re-wrenches.org
> 
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> 
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Re: [RE-wrenches] Using the North Facing Roof

[billbrooks7]

Jarmo,



Your intent was laudable, but simple trigonometry just flat out fails with the 
complexity of solar geometry. PVWatts is so easy to use that anyone, without 
any knowledge of trigonometry, can use it with far more accurate results. Take 
advantage of nice, free software that your tax dollar paid for many years ago.



Your harvest calculations don’t take into account about 20 factors that impact 
solar energy on a PV array. You are only looking at instantaneous sunlight at 
noon on a south-facing surface. There is almost nothing that we can learn from 
that simple of an analysis which is why we turned to simulations over 25 years 
ago. I have all my complex geometry sun position equations from the solar class 
I took in 1985, but to calculate energy from those equations requires hourly 
weather data and a computer—no other method will work. PVWatts does this.



Use PVWatts and continue to advocate the installation of PV modules wherever 
they make economic sense—north, south, east, or west.



Bill.





From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf 
Of jarmo.venalai...@schneider-electric.com
Sent: Friday, July 31, 2015 3:53 PM
To: RE-wrenches 
Subject: Re: [RE-wrenches] Using the North Facing Roof



Hi:

I went over and looked at my calculations whereby I arrived at the simple 
expression that the change in harvested solar energy is bounded by the sin of 
the angle of tilt to the North.

As I was doing it however, it became clear that the reason this simple result 
popped up, is simply because,

1. The effect of tilting an array North is exactly the same as if the system 
was physically relocated farther North by that amount of degrees latitude.
2. There is a linearly decreasing amount of annual insolation which is a linear 
function of latitude.

Latitude  versus  Average Annual Insolation
30 degrees latitude has  8.7 kWh-m2
40 degrees latitude has  7.8 kWh-m2
50  degrees latitude has  6.7 kWh-m2
60  degrees latitude has  5.6 kWh-m2

3. The SIN function is very linear for small angles up to about 40 degrees 
Angle versus sin
sin(10) = 0.17
sin(20) = 0.34
sin(30) = 0.5
sin(40) = 0.64

The sin expression describing the effect of north tilt is a bounding function, 
whereby it bounds the maximum reduction in energy harvest as a function of 
tilt.  It is a bounding analysis as it does not take into account the effect of 
atmospheric diffuse radiation which has the effect of making the "tilt loss" 
less than it would be if the earth had no atmosphere.

For example if an array was tilted north by 40 degrees in Vancouver, with no 
atmosphere the modules would see no sunlight for 6 months of the year.  With an 
atmosphere, there is still a lot of light to be gathered.

Regardless, my intent with the exercise from the beginning was to find a bound 
for the potential "loss effect" of North tilt so that I could continue to 
advocate the maximum use of roof space even when that roof is North facing.

JARMO
_

Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  |   
Sales Application Engineer
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: +604-505-0291
Email:   
jarmo.venalai...@schneider-electric.com  |   Site:   
www.Xantrex.com  |   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1







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





From:

mailto:billbroo...@sbcglobal.net> >


To:

"'RE-wrenches'" mailto:re-wrenches@lists.re-wrenches.org> >,


Date:

07/28/2015 12:20 PM


Subject:

Re: [RE-wrenches] Using the North Facing Roof


Sent by:

"RE-wrenches" mailto:re-wrenches-boun...@lists.re-wrenches.org> >



  _




Jarmo,

Unfortunately, simple is wrong in this case—and detrimental to the PV industry 
that needs all the roof real estate it can find.

Bill.

Bill Brooks, PE
Principal
Brooks Engineering


From: RE-wrenches [  
mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of 
jarmo.venalai...@schneider-electric.com 

Sent: Tuesday, July 28, 2015 10:43 AM
To: RE-wrenches mailto:re-wrenches@lists.re-wrenches.org> >
Subject: Re: [RE-wrenches] Using the North Facing Roof

Hi:

Granted that the description is very simple, but that is the intent.

The essence of it is that the "loss" for small variations in angle of incidence 
is approximately bounded by, (less than), the sin of the angle between the 
orientations of two panels/arrays in question.

10 degrees --->  minus 17%
20 degrees --->  minus 33%
30 degrees --->  minus 50%

If you go through the detailed math and take into account  atmospheric effects, 
especially when the sun is near the horizons, temperature, location, weather, 
etc., the result will vary, but will not be worse than the sin of th

Re: [RE-wrenches] Dream system.

[Glenn Burt]

I would suggest a Solar Edge inverter system, some lithium batteries, an Aqueon 
battery system, a variety of safety equipment and trying to partner with a 
local installation firm for site visits, and possibly hands on work.

Sincerely,
Glenn Burt
Sent from my 'smart' phone so please excuse grammar and typos.

-Original Message-
From: "Solar" 
Sent: ‎7/‎31/‎2015 17:05
To: "Wrenches" 
Subject: [RE-wrenches] Dream system.

Hello all,

I was recently hired to be the full time electrical instructor at a local 
community college. In the second year of the class there is a 6 credit 
"renewable energy and habitat house" course. I have been teaching at this 
college as an adjunct instructor since 2009 teaching for 3 of the 7 local iron 
ore mines,the local paper mill as well as doing most of the NEC code update 
courses. During that time I ran a one year and a 6 month solar PV course. I 
have a fairly nice lab built for the PV course consisting of the following:

2 axis tracker 
Fixed tilt pole mount 
20'x16' mock roof with shingles and metal roofing 
Enphase systems 
(3) 700W SMA inverters
Outback setup
Xantrax 600v 80A charge controller 
Magnum 4024 inverter (AC coupled goal with this) 
Tigos
300W Morningstar on a demo cart
Couple Solectria inverter (not used much)
Trace 4024 (purchased in 99)
Trace DR 1524 that goes along with our 1Kw Bergy 
Multiple battery brands and types AGM and flooded 
Pathfinders
Suneye (2 210s)
600V Solmetric PVA
Racking, quickmounts standoffs, clamps nuts and bolts...


Modules include: 90W sunwize, Solarwolrd 175, REC 215W, silicon energy 190W, 
kyocera 210W, solar frontier 100W (I think 100W) AEE 95W, Dasol 15, 30, 135w. 

Assuming I stay with this job for the next 25 years, which will take me into my 
early 60s and my goal, I will have a yearly budget to spend adding to this lab. 

Here is the question, seeing what we have now what individual pieces would you 
add or what system would you build with the goal of community education or 
training electrical students and electricians. 

Long winded but I am very interested to hear your ideas!

Have a good weekend and thanks!

Jesse



Sent from my iPhone
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Re: [RE-wrenches] Dream system.

[Benn Kilburn]

Jason mentioned S-5 clamps... adding to that, it might be interesting to
have samples of many different racking system components.  It would be
interesting to see all the different rail profiles and attachment methods
(racking system to roof and module to rail) that are out there.

*Benn Kilburn *
CSA Certified Solar Photovoltaic Systems Electrician, SkyFire Energy Inc
6706 – 82 Ave NW | Edmonton, AB | T6B 0E7
P: 780-474-8992 | F: 888-405-5843 | www.skyfireenergy.com
[image: email]  [image: facebook]
 [image: twitter]
 [image: linkedin]

 [image: google] 

[image: SkyFire Energy Logo_horizontal]

On Fri, Jul 31, 2015 at 3:05 PM, Solar  wrote:

> Hello all,
>
> I was recently hired to be the full time electrical instructor at a local
> community college. In the second year of the class there is a 6 credit
> "renewable energy and habitat house" course. I have been teaching at this
> college as an adjunct instructor since 2009 teaching for 3 of the 7 local
> iron ore mines,the local paper mill as well as doing most of the NEC code
> update courses. During that time I ran a one year and a 6 month solar PV
> course. I have a fairly nice lab built for the PV course consisting of the
> following:
>
> 2 axis tracker
> Fixed tilt pole mount
> 20'x16' mock roof with shingles and metal roofing
> Enphase systems
> (3) 700W SMA inverters
> Outback setup
> Xantrax 600v 80A charge controller
> Magnum 4024 inverter (AC coupled goal with this)
> Tigos
> 300W Morningstar on a demo cart
> Couple Solectria inverter (not used much)
> Trace 4024 (purchased in 99)
> Trace DR 1524 that goes along with our 1Kw Bergy
> Multiple battery brands and types AGM and flooded
> Pathfinders
> Suneye (2 210s)
> 600V Solmetric PVA
> Racking, quickmounts standoffs, clamps nuts and bolts...
>
>
> Modules include: 90W sunwize, Solarwolrd 175, REC 215W, silicon energy
> 190W, kyocera 210W, solar frontier 100W (I think 100W) AEE 95W, Dasol 15,
> 30, 135w.
>
> Assuming I stay with this job for the next 25 years, which will take me
> into my early 60s and my goal, I will have a yearly budget to spend adding
> to this lab.
>
> Here is the question, seeing what we have now what individual pieces would
> you add or what system would you build with the goal of community education
> or training electrical students and electricians.
>
> Long winded but I am very interested to hear your ideas!
>
> Have a good weekend and thanks!
>
> Jesse
>
>
>
> Sent from my iPhone
> ___
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change listserver email address & settings:
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Re: [RE-wrenches] Using the North Facing Roof

[Jarmo . Venalainen]

Hi:

I went over and looked at my calculations whereby I arrived at the simple 
expression that the change in harvested solar energy is bounded by the sin 
of the angle of tilt to the North.

As I was doing it however, it became clear that the reason this simple 
result popped up, is simply because,

1. The effect of tilting an array North is exactly the same as if the 
system was physically relocated farther North by that amount of degrees 
latitude.
2. There is a linearly decreasing amount of annual insolation which is a 
linear function of latitude.

Latitude  versus  Average Annual Insolation
30 degrees latitude has  8.7 kWh-m2
40 degrees latitude has  7.8 kWh-m2
50  degrees latitude has  6.7 kWh-m2
60  degrees latitude has  5.6 kWh-m2

3. The SIN function is very linear for small angles up to about 40 degrees
Angle versus sin
sin(10) = 0.17 
sin(20) = 0.34
sin(30) = 0.5
sin(40) = 0.64

The sin expression describing the effect of north tilt is a bounding 
function, whereby it bounds the maximum reduction in energy harvest as a 
function of tilt.  It is a bounding analysis as it does not take into 
account the effect of atmospheric diffuse radiation which has the effect 
of making the "tilt loss" less than it would be if the earth had no 
atmosphere.

For example if an array was tilted north by 40 degrees in Vancouver, with 
no atmosphere the modules would see no sunlight for 6 months of the year. 
With an atmosphere, there is still a lot of light to be gathered.

Regardless, my intent with the exercise from the beginning was to find a 
bound for the potential "loss effect" of North tilt so that I could 
continue to advocate the maximum use of roof space even when that roof is 
North facing.

JARMO
_
 


Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalai...@schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 








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




From:

To:
"'RE-wrenches'" , 
Date:
07/28/2015 12:20 PM
Subject:
Re: [RE-wrenches] Using the North Facing Roof
Sent by:
"RE-wrenches" 



Jarmo,
 
Unfortunately, simple is wrong in this case—and detrimental to the PV 
industry that needs all the roof real estate it can find.

Bill.
 
Bill Brooks, PE
Principal
Brooks Engineering
 
 
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On 
Behalf Of jarmo.venalai...@schneider-electric.com
Sent: Tuesday, July 28, 2015 10:43 AM
To: RE-wrenches 
Subject: Re: [RE-wrenches] Using the North Facing Roof
 
Hi: 

Granted that the description is very simple, but that is the intent.   

The essence of it is that the "loss" for small variations in angle of 
incidence is approximately bounded by, (less than), the sin of the angle 
between the orientations of two panels/arrays in question. 

10 degrees --->  minus 17% 
20 degrees --->  minus 33% 
30 degrees --->  minus 50% 

If you go through the detailed math and take into account  atmospheric 
effects, especially when the sun is near the horizons, temperature, 
location, weather, etc., the result will vary, but will not be worse than 
the sin of the angle. 

I'll draw out better picture with more detail for Vancouver.  We're at a 
fairly high latitude, so overall array orientation is a more sensitive 
factor than farther south. 

JARMO 

_
 


Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalai...@schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 









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



From: 
Brian Mehalic  
To: 
RE-wrenches , 
Date: 
07/28/2015 09:48 AM 
Subject: 
Re: [RE-wrenches] Using the North Facing Roof 
Sent by: 
"RE-wrenches" 
 




The analysis of 50% of south facing production is too simplistic; running 
some modeling shows that, depending on the latitude, the difference can be 
much smaller, approaching 25% less for the north facing.  I think this 
layout could become more common especially on low slope commercial roofs, 
where the north facing module would occupy space that was already unused 
due to interrow shading.  Of course the closer to the equator the less 
difference between production of the north and south arrays...and you 
better be careful when stringing them in series so as not to mix N and S 
facing..plus filling in all those gaps between rows could make servicing 
the array a bit problematic! 

Cheers, 


Brian Mehalic 
NABCEP Certified Solar PV Installation Professional™ R031508-59 

P

Re: [RE-wrenches] Dream system.

[Jason Szumlanski]

That looks pretty good! Note sure if it's within the scope, but computer
software for design and shading analysis might be good. I didn't see a 72
cell module or a Sunpower on the list. S-5 clamps and various roof panels,
shingles, and tiles maybe.

Jason Szumlanski


On Fri, Jul 31, 2015 at 5:05 PM, Solar  wrote:

> Hello all,
>
> I was recently hired to be the full time electrical instructor at a local
> community college. In the second year of the class there is a 6 credit
> "renewable energy and habitat house" course. I have been teaching at this
> college as an adjunct instructor since 2009 teaching for 3 of the 7 local
> iron ore mines,the local paper mill as well as doing most of the NEC code
> update courses. During that time I ran a one year and a 6 month solar PV
> course. I have a fairly nice lab built for the PV course consisting of the
> following:
>
> 2 axis tracker
> Fixed tilt pole mount
> 20'x16' mock roof with shingles and metal roofing
> Enphase systems
> (3) 700W SMA inverters
> Outback setup
> Xantrax 600v 80A charge controller
> Magnum 4024 inverter (AC coupled goal with this)
> Tigos
> 300W Morningstar on a demo cart
> Couple Solectria inverter (not used much)
> Trace 4024 (purchased in 99)
> Trace DR 1524 that goes along with our 1Kw Bergy
> Multiple battery brands and types AGM and flooded
> Pathfinders
> Suneye (2 210s)
> 600V Solmetric PVA
> Racking, quickmounts standoffs, clamps nuts and bolts...
>
>
> Modules include: 90W sunwize, Solarwolrd 175, REC 215W, silicon energy
> 190W, kyocera 210W, solar frontier 100W (I think 100W) AEE 95W, Dasol 15,
> 30, 135w.
>
> Assuming I stay with this job for the next 25 years, which will take me
> into my early 60s and my goal, I will have a yearly budget to spend adding
> to this lab.
>
> Here is the question, seeing what we have now what individual pieces would
> you add or what system would you build with the goal of community education
> or training electrical students and electricians.
>
> Long winded but I am very interested to hear your ideas!
>
> Have a good weekend and thanks!
>
> Jesse
>
>
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Re: [RE-wrenches] Dream system.

[Jarmo . Venalainen]

Hi:

I would add,

1. Battery Monitoring with logging capability
2. Remote monitoring and control over the web
3. Lion battery and battery manager, (open format manager circuits so that 
it can be seen how things work).
4.  GFCI's and ELCI's on AC circuits
5. Generator and automatic generator start controller

If you suggestions on specific models, contact me offline

JARMO
_
 


Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalai...@schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 








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




From:
Solar 
To:
Wrenches , 
Date:
07/31/2015 02:05 PM
Subject:
[RE-wrenches] Dream system.
Sent by:
"RE-wrenches" 



Hello all,

I was recently hired to be the full time electrical instructor at a local 
community college. In the second year of the class there is a 6 credit 
"renewable energy and habitat house" course. I have been teaching at this 
college as an adjunct instructor since 2009 teaching for 3 of the 7 local 
iron ore mines,the local paper mill as well as doing most of the NEC code 
update courses. During that time I ran a one year and a 6 month solar PV 
course. I have a fairly nice lab built for the PV course consisting of the 
following:

2 axis tracker 
Fixed tilt pole mount 
20'x16' mock roof with shingles and metal roofing 
Enphase systems 
(3) 700W SMA inverters
Outback setup
Xantrax 600v 80A charge controller 
Magnum 4024 inverter (AC coupled goal with this) 
Tigos
300W Morningstar on a demo cart
Couple Solectria inverter (not used much)
Trace 4024 (purchased in 99)
Trace DR 1524 that goes along with our 1Kw Bergy 
Multiple battery brands and types AGM and flooded 
Pathfinders
Suneye (2 210s)
600V Solmetric PVA
Racking, quickmounts standoffs, clamps nuts and bolts...


Modules include: 90W sunwize, Solarwolrd 175, REC 215W, silicon energy 
190W, kyocera 210W, solar frontier 100W (I think 100W) AEE 95W, Dasol 15, 
30, 135w. 

Assuming I stay with this job for the next 25 years, which will take me 
into my early 60s and my goal, I will have a yearly budget to spend adding 
to this lab. 

Here is the question, seeing what we have now what individual pieces would 
you add or what system would you build with the goal of community 
education or training electrical students and electricians. 

Long winded but I am very interested to hear your ideas!

Have a good weekend and thanks!

Jesse



Sent from my iPhone
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[RE-wrenches] East-West arrays with single MPPT

[Greg]

Wrenches,

I ran across this article titled "Efficient East-West Orientated PV 
Systems with One MPP Tracker".  by Dietmar Staudacher

http://www.interpv.net/tech/tech_print.asp?idx=418&part_code=030140054

He tested thin film and crystalline PV.  It's a pretty good read. He 
found that the V on the I-V curve stays pretty constant until you get 
down to pretty low irradiation.  In short his conclusion was you would 
lose less than 1% if you had equal size arrays, 180 out from each other, 
E-W at the same tilt angle.  Less wire, less inverter, almost the same 
power.


I searched this list for "east west" and only found a couple posts on 
modeling multi-plane arrays so I'm thinking maybe this is worth 
posting.  If anyone has any practical experience with this I'd be 
interesting in hearing what your results were.  I've got an off grid 
customer that has data for everything.  I'll probably try it at his 
place and see what happens.


Thanks to all of you,

Greg Egan
Remote Power Inc.
Fairbanks, AK
**
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[RE-wrenches] Dream system.

[Solar]

Hello all,

I was recently hired to be the full time electrical instructor at a local 
community college. In the second year of the class there is a 6 credit 
"renewable energy and habitat house" course. I have been teaching at this 
college as an adjunct instructor since 2009 teaching for 3 of the 7 local iron 
ore mines,the local paper mill as well as doing most of the NEC code update 
courses. During that time I ran a one year and a 6 month solar PV course. I 
have a fairly nice lab built for the PV course consisting of the following:

2 axis tracker 
Fixed tilt pole mount 
20'x16' mock roof with shingles and metal roofing 
Enphase systems 
(3) 700W SMA inverters
Outback setup
Xantrax 600v 80A charge controller 
Magnum 4024 inverter (AC coupled goal with this) 
Tigos
300W Morningstar on a demo cart
Couple Solectria inverter (not used much)
Trace 4024 (purchased in 99)
Trace DR 1524 that goes along with our 1Kw Bergy 
Multiple battery brands and types AGM and flooded 
Pathfinders
Suneye (2 210s)
600V Solmetric PVA
Racking, quickmounts standoffs, clamps nuts and bolts...


Modules include: 90W sunwize, Solarwolrd 175, REC 215W, silicon energy 190W, 
kyocera 210W, solar frontier 100W (I think 100W) AEE 95W, Dasol 15, 30, 135w. 

Assuming I stay with this job for the next 25 years, which will take me into my 
early 60s and my goal, I will have a yearly budget to spend adding to this lab. 

Here is the question, seeing what we have now what individual pieces would you 
add or what system would you build with the goal of community education or 
training electrical students and electricians. 

Long winded but I am very interested to hear your ideas!

Have a good weekend and thanks!

Jesse



Sent from my iPhone
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