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Post by spiderbob on Dec 20, 2015 21:49:36 GMT -8
What is the temperature range of this panel? I can't find it anywhere.
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Post by jsb2000 on Dec 21, 2015 7:28:30 GMT -8
What is the temperature range of this panel? I can't find it anywhere. It's right in the spec sheet on their web site: Operating Module Temperature: -40 Degrees C to +80 Degrees C Nominal Operating Cell Temperature 47 +/- 2 Degrees C. Let me know if you need an actual link to the PDF. |
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Post by spiderbob on Dec 21, 2015 7:40:54 GMT -8
dang jsb, I must have looked at that several times and missed it, thank you
What I trying to figure is loss due to heat. Best performance temp, etc.
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Post by jsb2000 on Dec 21, 2015 11:04:32 GMT -8
dang jsb, I must have looked at that several times and missed it, thank you What I trying to figure is loss due to heat. Best performance temp, etc. Glad I could help, Bob. I've learned from experience that if you stare at spec sheets long enough, they eventually start staring back at you! Loss due to heat, eh? I assume you're looking to see what the drop of efficiency is depending on how hot the panels get? I had that concern with my set up too. My 100W panel is mounted on a metal awning on the back of my property. That awning can get pretty hot in the summer, and I worried that I might "bake some of the efficiency" right out of the panel. Luckily, the brackets provided by Renogy allow enough airflow beneath the panel to keep things from "cooking." |
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Post by spiderbob on Dec 21, 2015 11:09:23 GMT -8
dang jsb, I must have looked at that several times and missed it, thank you What I trying to figure is loss due to heat. Best performance temp, etc. Glad I could help, Bob. I've learned from experience that if you stare at spec sheets long enough, they eventually start staring back at you! Loss due to heat, eh? I assume you're looking to see what the drop of efficiency is depending on how hot the panels get? I had that concern with my set up too. My 100W panel is mounted on a metal awning on the back of my property. That awning can get pretty hot in the summer, and I worried that I might "bake some of the efficiency" right out of the panel. Luckily, the brackets provided by Renogy allow enough airflow beneath the panel to keep things from "cooking." That is exactly what I was concerned about. I'm putting 4 panels on top of the motorhome next week, I know on the trailer I traded in, I had 4 on top of that, and during the summer months (especially when it got hot here in So Cal) I was registering less than normal. I didn't think to write all that down, but I want to figure out why, and see what I can do before this summer comes along. If I can do anything about it that is. I also use Renogy brackets so there is the circulation under the panels, but even the air is darn hot. I'm a desert person, I love the heat, so won't be leaving it anytime soon. |
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Post by Admin on Dec 22, 2015 8:43:18 GMT -8
Hello Spiderbob,
Here is the temperature specs for the 100 watt Mono panel.
Operating Module Temperature -40°C to +80°C
Nominal Operating Cell Temperature (NOCT) 47±2°C
Temperature Coefficient of Pmax -0.44%/°C
Temperature Coefficient of Voc -0.30%/°C
Temperature Coefficient of Isc 0.04%/°C
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Post by spiderbob on Dec 22, 2015 21:29:57 GMT -8
OK, so 47 degrees celsius is 117 degrees fahrenheit, so this is saying that the "Nominal Operating Cell Temperature is 47 plus or minus 2 degrees celsius. I do remember the panel getting at one point in the day 160 degrees fahrenheit. So can Admin, tell me what effect this will have on a panel?
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Post by Admin on Dec 23, 2015 8:22:20 GMT -8
Hello Spiderbob,
So at 47 degrees Celsius you will see a loss of about 9-10 watts for a 100 watt mono panel. The hotter the panel gets the greater the power loss.
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Post by spiderbob on Dec 31, 2015 8:30:15 GMT -8
This loss, it is only for the period of intense hot days, it's not permanent right?
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Post by Admin on Jan 7, 2016 10:10:47 GMT -8
Hello,
Yes this loss is only during those hot days and not a permanent loss.
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Post by TheoG on Feb 5, 2016 6:07:35 GMT -8
Hello,
I'm doing a science fair project with two of these panels, and I was measuring the amount of power output from each one. The load on the panels was 2 100W 8ohm resistors in series for each one. However, I encountered strange moments where the power output remained fixed for about 4 hours straight, around 4 watts and around 17 watts. These fixed power outputs occurred during mid-day when the light was most intense. Since these are obviously odd results, I was wondering if there was some circuitry in the junction box that might cause this. Is there some sort of protection diode that regulates this depending on how much power is to be drawn?
Thank you for any help you can offer.
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Post by Admin on Feb 8, 2016 17:04:50 GMT -8
Hello,
Did you try other resistors since the output power will vary depending on the temperature and resistor value. The junction box does have two bypass diodes but that won't regulate the output from the panel. Before testing the panel with the resistors did you test the open circuit voltage and short circuit current to make sure the panel was working normally.
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