array temperature question

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pss
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My RE system: 8330 watts in three strings, Flexmax 60 x 3, Radian 8048A, GSLC load center, Mate 3S, Hub 10.3, FN-DC and 900 Amp, 48V Trojan T105-RE battery bank.

Re: array temperature question

Post by pss »

Let's assume that all of your time consuming work determines that given an identical amount of sunlight each year and an equal temperature each year, your angle optimization results in an annual gain of 1000 watts of production. At 20 cents a watt, that's $200.00 annually in increased production.
My question is this: what is the cost in dollars for your time and cost in dollars for your brain power used in doing this project? Do you think it will be more or less than $200 for the first 2 years of this project?
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Heimhenge
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My RE system: 9 CSUN 390W panels for 3.51 kW
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Outback Radian GS4048A-01 inverter
Outback FM100 charge controller
Outback FLEXnet DC monitor
Outback MATE3s system controller
Outback Hub
Trace DC breaker and shunt box
Lifeline GPL-8DL x4 = 12.2 kWh @ 48 volts
Running OpticsRE since March 2020
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Re: array temperature question

Post by Heimhenge »

Most of the motivation comes from the fact that I'm a retired science teacher with a lot of time on my hands. The rest of it comes from natural curiosity. Any amount of gain will be a win for me. O:)
provo
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My RE system: Sixteen Evergreen EC-120
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Location: Sierra foothills

Re: array temperature question

Post by provo »

Heimhenge wrote: Thu Oct 01, 2020 1:04 pm Most of the motivation comes from the fact that I'm a retired science teacher with a lot of time on my hands. The rest of it comes from natural curiosity. Any amount of gain will be a win for me. O:)
Hear, hear! Math is fun :grin: ...
raysun
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Re: array temperature question

Post by raysun »

Math class! My favorite place to sleep.

Now chemistry...
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Heimhenge
Forum Guru
Posts: 133
Joined: Sun Jan 26, 2020 10:28 am
My RE system: 9 CSUN 390W panels for 3.51 kW
UniStrut PV rack on a flat roof
Midnight Solar MNPV3 combiner box w/ breakers
Outback Radian GS4048A-01 inverter
Outback FM100 charge controller
Outback FLEXnet DC monitor
Outback MATE3s system controller
Outback Hub
Trace DC breaker and shunt box
Lifeline GPL-8DL x4 = 12.2 kWh @ 48 volts
Running OpticsRE since March 2020
Location: 30 miles north of Phoenix @ elevation 2200 ft
Contact:

Re: array temperature question

Post by Heimhenge »

provo wrote: Thu Oct 01, 2020 1:48 pm
Heimhenge wrote: Thu Oct 01, 2020 1:04 pm Most of the motivation comes from the fact that I'm a retired science teacher with a lot of time on my hands. The rest of it comes from natural curiosity. Any amount of gain will be a win for me. O:)
Hear, hear! Math is fun :grin: ...
Yes it is, and now that I have the spreadsheet worked out (which took a couple hours) all that is required is a monthly walk up the stairs to my flat roof, and a quick measurement of the panel temp using my IR remote thermometer. Takes only a few minutes. And the spreadsheet populates itself since the sun elevation at solar noon is a known value.
provo
Forum Czar
Posts: 720
Joined: Thu Jul 27, 2006 4:34 pm
My RE system: Sixteen Evergreen EC-120
(4 strings, total 1920W)
Eight Rolls S-550 (2 strings, total ~800Ah @ 24V)
One FM80
One VFXR3524A
Hub 10
Mate3s
FNDC and Trimetric
Honda EU3000is generator
Location: Sierra foothills

Re: array temperature question

Post by provo »

Heimhenge wrote: Fri Oct 02, 2020 10:33 am
Yes it is, and now that I have the spreadsheet worked out (which took a couple hours) all that is required is a monthly walk up the stairs to my flat roof, and a quick measurement of the panel temp using my IR remote thermometer. Takes only a few minutes. And the spreadsheet populates itself since the sun elevation at solar noon is a known value.
My favorite spreadsheets to write are for doing vector algebra. Like, if my neighbor's weather station says we have 650W/m2 right now, and the sun is over THERE, and my panels are aimed THERE, how many watts of sunlight am I getting?
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Heimhenge
Forum Guru
Posts: 133
Joined: Sun Jan 26, 2020 10:28 am
My RE system: 9 CSUN 390W panels for 3.51 kW
UniStrut PV rack on a flat roof
Midnight Solar MNPV3 combiner box w/ breakers
Outback Radian GS4048A-01 inverter
Outback FM100 charge controller
Outback FLEXnet DC monitor
Outback MATE3s system controller
Outback Hub
Trace DC breaker and shunt box
Lifeline GPL-8DL x4 = 12.2 kWh @ 48 volts
Running OpticsRE since March 2020
Location: 30 miles north of Phoenix @ elevation 2200 ft
Contact:

Re: array temperature question

Post by Heimhenge »

I don't much enjoy 3D vector analysis. That's why I'm getting my data at solar noon. :smile:
pss
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My RE system: 8330 watts in three strings, Flexmax 60 x 3, Radian 8048A, GSLC load center, Mate 3S, Hub 10.3, FN-DC and 900 Amp, 48V Trojan T105-RE battery bank.

Re: array temperature question

Post by pss »

What happens to the analysis if say for 6 days you have 5 hours of bright sunshine, except on 3 days it was sunny at 10 am and cloudy at 1 pm while on 3 other days it was cloudy at 10 am and sunny at 1 pm?
Same amount of sunshine, just from different angles?

Now, I suggest you take a panel and place it in your basement or garage and place a proper solar light source at a distance. Make the light source able to be connected to an arm that can swing across the panel in an arc over a period of 8-12 hours. Then vary the ambient temperatures. Make your power measurements.

Please report back your findings.
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Heimhenge
Forum Guru
Posts: 133
Joined: Sun Jan 26, 2020 10:28 am
My RE system: 9 CSUN 390W panels for 3.51 kW
UniStrut PV rack on a flat roof
Midnight Solar MNPV3 combiner box w/ breakers
Outback Radian GS4048A-01 inverter
Outback FM100 charge controller
Outback FLEXnet DC monitor
Outback MATE3s system controller
Outback Hub
Trace DC breaker and shunt box
Lifeline GPL-8DL x4 = 12.2 kWh @ 48 volts
Running OpticsRE since March 2020
Location: 30 miles north of Phoenix @ elevation 2200 ft
Contact:

Re: array temperature question

Post by Heimhenge »

pss wrote: Fri Oct 02, 2020 12:47 pm What happens to the analysis if say for 6 days you have 5 hours of bright sunshine, except on 3 days it was sunny at 10 am and cloudy at 1 pm while on 3 other days it was cloudy at 10 am and sunny at 1 pm? Same amount of sunshine, just from different angles?
Well this is Arizona after all, so I'd be OK with missing a day or two either way from the targeted 25th of each month. The clear-sky data I'm looking for won't change much over that amount of time. Will just have to trust the NWS forecast.
pss wrote: Fri Oct 02, 2020 12:47 pm Now, I suggest you take a panel and place it in your basement or garage and place a proper solar light source at a distance. Make the light source able to be connected to an arm that can swing across the panel in an arc over a period of 8-12 hours. Then vary the ambient temperatures. Make your power measurements.
Should I be pumping carbon dioxide into the space also? :smile:
pss
Forum Czar
Posts: 752
Joined: Mon Jul 24, 2017 8:40 am
My RE system: 8330 watts in three strings, Flexmax 60 x 3, Radian 8048A, GSLC load center, Mate 3S, Hub 10.3, FN-DC and 900 Amp, 48V Trojan T105-RE battery bank.

Re: array temperature question

Post by pss »

No, but have a CO detector in place and fire suppression system, surveillance cameras, alarm system, sump pump, dehumidifier, humidifier, smoke detector, pest control and do not admit dogs, cats or children to the test area.
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