Everything Solar Forum

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Original Message:
Sent: 3/16/2022 11:58:00 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Ernie - As you know the 'tracking' mechanism is 'mechanical' and will tend to break down regularly ! If you have a tracking PV array, on a small scale the problem may be accessible for repairs ! On a large scale the mechanical apparatus involved may not break down, but when it does, it's beyond the scale that would make it easy to repair ! Therefore, the size of many community solar projects allow for the advantage of simple south facing PV array, in addition to the slant angle of 'latitude (+/-) 15 degrees' will be optimum for these PV projects ! I work with small scale, 'off-grid' solar and do appreciate your question !

------------------------------
John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com
------------------------------

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Hey, John, thanks for the reply.
      If you are right on the reason, that just means to me that this is a problem that needs attention--to develop a reliable, low-cost tracking system.  Only one-axis tracking is enough to gain 90% of the benefit.  But, I would imagine that someone has already published a paper digging into this question.
      Hey, you live way up north.  Long summer days should be very good for tracking.

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Original Message:
Sent: 03-17-2022 09:20 AM
From: John Burke
Subject: What's wrong with tracking on large solar arrays?

Ernie - As you know the 'tracking' mechanism is 'mechanical' and will tend to break down regularly ! If you have a tracking PV array, on a small scale the problem may be accessible for repairs ! On a large scale the mechanical apparatus involved may not break down, but when it does, it's beyond the scale that would make it easy to repair ! Therefore, the size of many community solar projects allow for the advantage of simple south facing PV array, in addition to the slant angle of 'latitude (+/-) 15 degrees' will be optimum for these PV projects ! I work with small scale, 'off-grid' solar and do appreciate your question !

------------------------------
John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Ernie - We do live 'up north' in the most northern state in the US, (other that Alaska !) ... although we're in the 'furthest East', and 'Downeast' as they say ! (We're as far south as you can go, when you're at the 'far eastern' ... Washington County, Maine) ... "The Sunrise County, USA" ! Of course we do get the earliest 'sunset' as well ! We have a small, 'off-grid' PV array on the passive solar 'owner built' home ... here on the coast of Maine, Jonesport. The four 240W PV modules give the 'required' electric power we desire here ! Tracking has it's advantage in some circumstances, but I stand by the 'old adage' ... You are better off with additional PV modules, (as others have agreed with me here), than the possible 'headache' of a tracking system ('mechanical breakdown'), ... and if you happen to be 'away' ... then you may almost cut you PV power completely 'OFF' ! ... since how often would a tracker 'quit' when the modules are facing directly South' ??? Keep up the effort for an 'inexpensive, fool-proof' tracking system ! Thank you

------------------------------
John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com
------------------------------

Original Message:
Sent: 03-17-2022 09:49 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

Hey, John, thanks for the reply.
      If you are right on the reason, that just means to me that this is a problem that needs attention--to develop a reliable, low-cost tracking system.  Only one-axis tracking is enough to gain 90% of the benefit.  But, I would imagine that someone has already published a paper digging into this question.
      Hey, you live way up north.  Long summer days should be very good for tracking.

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com

Original Message:
Sent: 03-17-2022 09:20 AM
From: John Burke
Subject: What's wrong with tracking on large solar arrays?

Ernie - As you know the 'tracking' mechanism is 'mechanical' and will tend to break down regularly ! If you have a tracking PV array, on a small scale the problem may be accessible for repairs ! On a large scale the mechanical apparatus involved may not break down, but when it does, it's beyond the scale that would make it easy to repair ! Therefore, the size of many community solar projects allow for the advantage of simple south facing PV array, in addition to the slant angle of 'latitude (+/-) 15 degrees' will be optimum for these PV projects ! I work with small scale, 'off-grid' solar and do appreciate your question !

------------------------------
John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

solar tracking, if used in a LARGE, array, is generally setup as E/W tracking only. By using only a single axis, more panels can be moved, with less energy, less cost, and better wind resistance.  2 axis tracking is a VERY expensive installation cost, and on a UTILITY SCALE would be cost prohibitive. With the significant reduction in cost of panels, simply installing an extra 15% of panels on a fixed array gathers the equivalent of a much smaller array that is tracking. The MONEY NUMBERS just don't work out in favor of any tracking other than single axis - and even with single axis tracking, the MAINTENANCE COST is a very significant part of the lifetime operation expense. it all boils down to math, money, profit and payback time.

------------------------------
Joe Utasi
PV Solar Consultant
Cinci Home Solar, Keowee Home Solar, DIY Solar Helper
joe@cincihomesolar.com
------------------------------

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Dual axis tracking is possible.  Due to the additional installation and maintenance cost, it is usually more cost effective to use a fixed ground mount to obtain the same amount of electrical energy.

------------------------------
Stu Besnoff
owner
Alpine Solar Heat and Hot Water, LLC
stu@AlpineSolarHeat.com
------------------------------

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

There is nothing wrong with tracking per-say.  It is just that extra movmement adds GREATLY to the cost of a system and then adds maintenance to what is normally maintenance free.  It is just much more cost effective to add a few more panels to a fixed array.

------------------------------
David Hrivnak
Sales/Engineering
EcoLogical (part time)
dhrivnak@chartertn.net
------------------------------

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Original Message:
Sent: 3/16/2022 11:58:00 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Original Message:
Sent: 3/18/2022 6:55:00 PM
From: Victor Aguilar
Subject: RE: What's wrong with tracking on large solar arrays?

In a nutshell,...

Bankability and LCOE are gods in utility scale solar.

Complexity robs profits if not cost justified. It is cheaper to simply orient more fixed panels toward the most profitable azimuth. For us in the western US,..that means WEST.

Tracking typically only makes sense when you are space constrained.

Vic Aguilar

Sustainable Energy Consultant

NABCEP COK#081309

(626)633-6682

www.sustainergyadvisors.com/gallery/

Please consider your environmental responsibility. Before printing this e-mail message, ask yourself whether you really need a hard copy.

Original Message:
Sent: 3/16/2022 11:58:00 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

South orientation will produce the most energy but West can be more profitable depending on the Time-of-Day rates of the utility. A West orientation delays the peak production time by several hours compared to a South orientation. If the electric usage is higher in the late afternoon/early evening when it is hotter and more air conditioners are on, and the utility rates are higher to compensate for this, then it could make economic sense to orient your panels to the West.

------------------------------
Thomas Grant
Director
XanaduEnergy
Fairway KS
tjg4@aol.com
------------------------------

Original Message:
Sent: 03-21-2022 09:43 AM
From: Kenny Blemel
Subject: What's wrong with tracking on large solar arrays?

Mar 18, 2022 3:55 PM https://community.ases.org/network/members/profile?UserKey=d77f39fd-47d3-4768-9490-7761bdeece0e. Click or tap to follow the link." data-linkindex="30" style="margin: 0px; color: rgb(87, 177, 181); text-decoration: underline">Victor Aguilar

Question - How is WEST the most profitable? >  Would not 50% of each day and a large amount of gain in the winter months be lost? 

Mar 18, 2022 3:55 PM https://community.ases.org/network/members/profile?UserKey=d77f39fd-47d3-4768-9490-7761bdeece0e. Click or tap to follow the link." data-linkindex="30" style="margin: 0px; color: rgb(87, 177, 181); text-decoration: underline">Victor Aguilar

In a nutshell,... Bankability and LCOE are gods in utility scale solar. Complexity robs profits if not cost justified. It is cheaper to simply orient more fixed panels toward the most profitable azimuth. For us in the western US,..that means WEST. Tracking typically only makes sense when you are space constrained. Vic Aguilar Sustainable Energy Consultant

Original Message:
Sent: 3/18/2022 6:55:00 PM
From: Victor Aguilar
Subject: RE: What's wrong with tracking on large solar arrays?

In a nutshell,...

Bankability and LCOE are gods in utility scale solar.

Complexity robs profits if not cost justified. It is cheaper to simply orient more fixed panels toward the most profitable azimuth. For us in the western US,..that means WEST.

Tracking typically only makes sense when you are space constrained.

Vic Aguilar

Sustainable Energy Consultant

NABCEP COK#081309

(626)633-6682

www.sustainergyadvisors.com/gallery/

Please consider your environmental responsibility. Before printing this e-mail message, ask yourself whether you really need a hard copy.

Original Message:
Sent: 3/16/2022 11:58:00 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

A quick note. Be careful when having all these "what's the best" conversations. What is most profitable may not mean maximum production, especially in commercial arrays. I would stay away from all financial aspects, especially for res and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF. Focusing on the money is the wrong primary reason. Design for max efficiency and max power but meeting the engineering requirements for the particular system design and function. A justifiable reason for choosing a flatter production profile might be when an array is being designed to charge batteries. A longer flat curve might be better than a peak'ie curve despite yielding more energy. There are other engineering situations which also could arise, etc.. Tracking over the course of a day yields a much flatter profile and yields the most energy per KW installed. The challenge with tracking is wind loadings. Over design for that along with the movement engineering and maint. will be minimized. 

------------------------------
william fitch
Owner
www.WeAreSolar.com
fcfcfc@ptd.net
------------------------------

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Bill Fitch makes a good point. There is no single metric of 'best'. A paper from the now defunct Solar Pro magazine (issue 11.1 2018) authored by Paul Grana called 'Design Optimization in Constrained Applications' makes the case that the same commercial rooftop could have three different installations depending on the goal. I attached it here. See table below. You can optimized for different constraints:  by area, budget, or power injections.  Can result in different tilt, kW installed, energy produced. And in net revenue or NPV. Similar with tracking.

------------------------------
Steven Hegedus
Professor and Senior Scientist
University of Delaware
Newark Delaware
ssh@udel.edu
------------------------------

Original Message:
Sent: 03-22-2022 10:39 AM
From: william fitch
Subject: What's wrong with tracking on large solar arrays?

A quick note. Be careful when having all these "what's the best" conversations. What is most profitable may not mean maximum production, especially in commercial arrays. I would stay away from all financial aspects, especially for res and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF. Focusing on the money is the wrong primary reason. Design for max efficiency and max power but meeting the engineering requirements for the particular system design and function. A justifiable reason for choosing a flatter production profile might be when an array is being designed to charge batteries. A longer flat curve might be better than a peak'ie curve despite yielding more energy. There are other engineering situations which also could arise, etc.. Tracking over the course of a day yields a much flatter profile and yields the most energy per KW installed. The challenge with tracking is wind loadings. Over design for that along with the movement engineering and maint. will be minimized. 

------------------------------
william fitch
Owner
www.WeAreSolar.com
fcfcfc@ptd.net

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

William Fitch - Than k you, I agree with your comments ... "I would stay away from all financial aspects, especially for res, and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF." ...
     I work with small 'off-grid' res PV systems and help folks with a 'D-I-Y' ambition ! Of course we do want maximum output, to keep the 'storage' up, and ready for the times we need to use the system ! A motivating factor for all 'clean renewable energy' projects should be to 'accelerate the move away from FF' ... and we all know that the FF industry and Wall Street are fighting this, from 'ground zero' !
     I also agree with your sentiment that we should be "designing for max efficiency and max power but meeting the engineering requirements for the particular system design and function" ! Please keep up this focus ... and the effort to 'End the Fossil Fuel Addiction' that we all suffer from ... thanks again !

------------------------------
John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com
------------------------------

Original Message:
Sent: 03-22-2022 10:39 AM
From: william fitch
Subject: What's wrong with tracking on large solar arrays?

A quick note. Be careful when having all these "what's the best" conversations. What is most profitable may not mean maximum production, especially in commercial arrays. I would stay away from all financial aspects, especially for res and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF. Focusing on the money is the wrong primary reason. Design for max efficiency and max power but meeting the engineering requirements for the particular system design and function. A justifiable reason for choosing a flatter production profile might be when an array is being designed to charge batteries. A longer flat curve might be better than a peak'ie curve despite yielding more energy. There are other engineering situations which also could arise, etc.. Tracking over the course of a day yields a much flatter profile and yields the most energy per KW installed. The challenge with tracking is wind loadings. Over design for that along with the movement engineering and maint. will be minimized. 

------------------------------
william fitch
Owner
www.WeAreSolar.com
fcfcfc@ptd.net

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Original Message:
Sent: 3/23/2022 3:41:00 PM
From: John Burke
Subject: RE: What's wrong with tracking on large solar arrays?

William Fitch - Than k you, I agree with your comments ... "I would stay away from all financial aspects, especially for res, and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF." ...
     I work with small 'off-grid' res PV systems and help folks with a 'D-I-Y' ambition ! Of course we do want maximum output, to keep the 'storage' up, and ready for the times we need to use the system ! A motivating factor for all 'clean renewable energy' projects should be to 'accelerate the move away from FF' ... and we all know that the FF industry and Wall Street are fighting this, from 'ground zero' !
     I also agree with your sentiment that we should be "designing for max efficiency and max power but meeting the engineering requirements for the particular system design and function" ! Please keep up this focus ... and the effort to 'End the Fossil Fuel Addiction' that we all suffer from ... thanks again !

------------------------------
John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com
------------------------------

Original Message:
Sent: 03-22-2022 10:39 AM
From: william fitch
Subject: What's wrong with tracking on large solar arrays?

A quick note. Be careful when having all these "what's the best" conversations. What is most profitable may not mean maximum production, especially in commercial arrays. I would stay away from all financial aspects, especially for res and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF. Focusing on the money is the wrong primary reason. Design for max efficiency and max power but meeting the engineering requirements for the particular system design and function. A justifiable reason for choosing a flatter production profile might be when an array is being designed to charge batteries. A longer flat curve might be better than a peak'ie curve despite yielding more energy. There are other engineering situations which also could arise, etc.. Tracking over the course of a day yields a much flatter profile and yields the most energy per KW installed. The challenge with tracking is wind loadings. Over design for that along with the movement engineering and maint. will be minimized. 

------------------------------
william fitch
Owner
www.WeAreSolar.com
fcfcfc@ptd.net

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

If you have people dying of thirst and you find a water source that can give you the volume but it comes out faster than they can drink it, the answer is not to slow it down and loose the output, but to find buckets to store the water until they can drink it. You pretty much said so when you used the phrase, "....without grid scale storage...." So the answer is not to curtail the production but to increase storage. FF's are self contained energy and storage where direct energy sources like Wind and Sun be it Thermal or Electric are not. This has always been known BUT often ignored. So the answer is to push harder for storage and not treat it as a separate issue. Rise to the occasion not stifle the opportunity.
Edit: For those readers who may not know all the above acronyms"
LCOE- Levelized Cost Of Energy (Total cost over entire time)
ROI- Return On Investment
MTBF- Mean Time Between Failures (Proportional to Complexity usually)
KPI's- Key Performance Indicators

------------------------------
william fitch
Owner
www.WeAreSolar.com
fcfcfc@ptd.net
------------------------------

Original Message:
Sent: 03-24-2022 07:22 AM
From: Victor Aguilar
Subject: What's wrong with tracking on large solar arrays?

Wrong, Wrong, Wrong,..

To reparaphrase the question, 'why not track on large (utility scale) ground mount arrays?'

The answer..

As I stayed originally, is that LCOE, ROI, MTBF, etc. are the KPI's for utility scale solar, which is facilitated by it's economics.

But this also affects it's power to offset FF.

California is a macrocosom of what happens when you build out massive amounts of PV without grid scale storage (search: 'CAISO duck'). People are watching California around the world to see how we manage the challenge of assimilating all this renewable and maintaining a reliable grid at the same time.

The reason that West is so important and is becoming more important in any grid system facing the same challenges relates to the fact that there is a massive ramp in demand in the afternoon just when solar starts to wane(CAISO duck quacking). In what's known as a 'North/South' grid like California, this demand is currently met by some of the least efficient most expensive and dirty sources of power called peaker plants. This is why economically, societally, and environmentally, we need systems that are designed to meet all three of these objectives and not ones that are blindly designed for maximum output that would flood the grid with power at a time when it's worth less than zero. Not helpful not economically optimal. Also bad for the success of our energy transition.

Original Message:
Sent: 3/23/2022 3:41:00 PM
From: John Burke
Subject: RE: What's wrong with tracking on large solar arrays?

William Fitch - Than k you, I agree with your comments ... "I would stay away from all financial aspects, especially for res, and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF." ...
     I work with small 'off-grid' res PV systems and help folks with a 'D-I-Y' ambition ! Of course we do want maximum output, to keep the 'storage' up, and ready for the times we need to use the system ! A motivating factor for all 'clean renewable energy' projects should be to 'accelerate the move away from FF' ... and we all know that the FF industry and Wall Street are fighting this, from 'ground zero' !
     I also agree with your sentiment that we should be "designing for max efficiency and max power but meeting the engineering requirements for the particular system design and function" ! Please keep up this focus ... and the effort to 'End the Fossil Fuel Addiction' that we all suffer from ... thanks again !

------------------------------
John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com

Original Message:
Sent: 03-22-2022 10:39 AM
From: william fitch
Subject: What's wrong with tracking on large solar arrays?

A quick note. Be careful when having all these "what's the best" conversations. What is most profitable may not mean maximum production, especially in commercial arrays. I would stay away from all financial aspects, especially for res and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF. Focusing on the money is the wrong primary reason. Design for max efficiency and max power but meeting the engineering requirements for the particular system design and function. A justifiable reason for choosing a flatter production profile might be when an array is being designed to charge batteries. A longer flat curve might be better than a peak'ie curve despite yielding more energy. There are other engineering situations which also could arise, etc.. Tracking over the course of a day yields a much flatter profile and yields the most energy per KW installed. The challenge with tracking is wind loadings. Over design for that along with the movement engineering and maint. will be minimized. 

------------------------------
william fitch
Owner
www.WeAreSolar.com
fcfcfc@ptd.net

Original Message:
Sent: 03-16-2022 08:58 AM
From: Ernie Rogers
Subject: What's wrong with tracking on large solar arrays?

I am no expert, just trying to understand.  When I see pictures of large solar arrays, the panels are stacked together in a way that would make efficient solar tracking impossible.  Tracking should allow efficient collection over a wider period of the day, thereby reducing the need for expensive storage.  Are power companies stupid?  What am I missing?

------------------------------
Ernie Rogers
Partner
ernie.e.rogers@gmail.com
------------------------------

Original Message:
Sent: 3/24/2022 11:02:00 AM
From: william fitch
Subject: RE: What's wrong with tracking on large solar arrays?

If you have people dying of thirst and you find a water source that can give you the volume but it comes out faster than they can drink it, the answer is not to slow it down and loose the output, but to find buckets to store the water until they can drink it. You pretty much said so when you used the phrase, "....without grid scale storage...." So the answer is not to curtail the production but to increase storage. FF's are self contained energy and storage where direct energy sources like Wind and Sun be it Thermal or Electric are not. This has always been known BUT often ignored. So the answer is to push harder for storage and not treat it as a separate issue. Rise to the occasion not stifle the opportunity.
Edit: For those readers who may not know all the above acronyms"
LCOE- Levelized Cost Of Energy (Total cost over entire time)
ROI- Return On Investment
MTBF- Mean Time Between Failures (Proportional to Complexity usually)
KPI's- Key Performance Indicators

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william fitch
Owner
www.WeAreSolar.com
fcfcfc@ptd.net
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Original Message:
Sent: 03-24-2022 07:22 AM
From: Victor Aguilar
Subject: What's wrong with tracking on large solar arrays?

Wrong, Wrong, Wrong,..

To reparaphrase the question, 'why not track on large (utility scale) ground mount arrays?'

The answer..

As I stayed originally, is that LCOE, ROI, MTBF, etc. are the KPI's for utility scale solar, which is facilitated by it's economics.

But this also affects it's power to offset FF.

California is a macrocosom of what happens when you build out massive amounts of PV without grid scale storage (search: 'CAISO duck'). People are watching California around the world to see how we manage the challenge of assimilating all this renewable and maintaining a reliable grid at the same time.

The reason that West is so important and is becoming more important in any grid system facing the same challenges relates to the fact that there is a massive ramp in demand in the afternoon just when solar starts to wane(CAISO duck quacking). In what's known as a 'North/South' grid like California, this demand is currently met by some of the least efficient most expensive and dirty sources of power called peaker plants. This is why economically, societally, and environmentally, we need systems that are designed to meet all three of these objectives and not ones that are blindly designed for maximum output that would flood the grid with power at a time when it's worth less than zero. Not helpful not economically optimal. Also bad for the success of our energy transition.

Original Message:
Sent: 3/23/2022 3:41:00 PM
From: John Burke
Subject: RE: What's wrong with tracking on large solar arrays?

William Fitch - Than k you, I agree with your comments ... "I would stay away from all financial aspects, especially for res, and focus on site maximum production (Engineering). Other wise things like 'West is best' can seem off the rails... The RE goal is to produce as much energy as possible which will yield the maximum displacement of FF." ...
     I work with small 'off-grid' res PV systems and help folks with a 'D-I-Y' ambition ! Of course we do want maximum output, to keep the 'storage' up, and ready for the times we need to use the system ! A motivating factor for all 'c