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Post by goingoffgrid on Dec 17, 2019 17:12:05 GMT
I am thinking about pushing the limit on the Rover 40.....Has ANYONE ran 2-500W series strings in parallel to the Rover 40 equaling 1000W? I am running a 24V setup and the CC is rated for 1040 with a max input voltage 100VDC. I understand the specs and ohms law...I am looking to hear from real world users if the ROVER 40 can handle prolong 1000W input/output without shorting its life. Of course, I know I will never(?) hit 1000W with this set up! LOL!
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Post by tattoo on Dec 17, 2019 18:18:38 GMT
I've done 800w with no problems with 12v, So you should be just fine with 24v and 1000w................
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Post by goingoffgrid on Dec 17, 2019 18:51:30 GMT
I have been running 800w to the Rover 40, Are/were you running a Rover 40 @ 800W @ 12V ?....I thought you mentioned you had a 60A CC in another post?
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Post by tattoo on Dec 17, 2019 21:22:53 GMT
I have been running 800w to the Rover 40, Are/were you running a Rover 40 @ 800W @ 12V ?....I thought you mentioned you had a 60A CC in another post? Yes I had a 40a CC and 8 100w panels then I upgraded to a 60a CC commander.............. Then I added 4 more 100w panels for a total of 12 panels now........... Always have been 12v.......
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Post by goingoffgrid on Dec 17, 2019 22:14:06 GMT
Ok....maybe I am not understanding the "specs"- MAX SOLAR INPUT POWER - 12v @520w. You were way above the input power, but now I think I over thought that aspect. I guess as long as you don't exceed the rated specified input voltage (100V) then it shouldn't matter if I had 2000W solar panel available power Admin, do you agree?
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Post by tattoo on Dec 17, 2019 22:35:38 GMT
It's my understanding is that you can go 3 times over the limit before it will damage the CC.......... I'm no where close to that........
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Post by goingoffgrid on Dec 17, 2019 22:51:53 GMT
It's my understanding is that you can go 3 times over the limit before it will damage the CC.......... I'm no where close to that........ I am not trying to exceed the specs... but now I am trying to wrap my arms around their meaning. In my 24V system the specs state 1040W Max input... Now I'm wondering .....as in household 120V electronics, the power is unlimited (relatively speaking) but device will only use what power/amps that is needed as long as 120V is not exceeded. Is this the same principle with a CC ?
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Post by tattoo on Dec 18, 2019 0:31:50 GMT
Now I'm wondering .....as in household 120V electronics, the power is unlimited (relatively speaking) but device will only use what power/amps that is needed as long as 120V is not exceeded. Is this the same principle with a CC ? I don't know for sure but I think you are correct................ That is a very good question..........
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Post by bupkis on Dec 18, 2019 13:59:53 GMT
1040 is greater than 1000.
120v utility is always on and loads use what they need.
A CC that is not in MPPT/Bulk is limiting power to the battery/loads to maintain a set pt voltage. AFIK the CC connects and disconnects from the panel to limit power.
A 500w string could exceed 100v Voc if you use 5 x 100w panels, 2 x 250w '24v' (60 cells) would not.
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Post by goingoffgrid on Dec 18, 2019 14:54:01 GMT
1040 is greater than 1000. 120v utility is always on and loads use what they need. A CC that is not in MPPT/Bulk is limiting power to the battery/loads to maintain a set pt voltage. AFIK the CC connects and disconnects from the panel to limit power. A 500w string could exceed 100v Voc if you use 5 x 100w panels, 2 x 250w '24v' (60 cells) would not. I realize 1040 is greater than 1000. My original question(point) was; is a ROVER 40 "robust enough to run at close to full power (every sunny day) ?
Then I started wondering.....Can a CC be damaged if the AVAILBLE input power far exceeds the max rated input spec power. i.e. 3000w solar panel to a 1000W rated CC. I am thinking the extra power is just "wasted" not used.
I have 4x100w series panels x 2 parallel connected now, they have never reached >80V, so I think one more panel will be under 100V, But that was not measured Voc.....To measure Voc the panels cannot be connected to the CC anyway.....Right? How does the controller know if it is Voc or Vmp.
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Post by bupkis on Dec 18, 2019 15:39:28 GMT
Back to exceeding specs! 1000 does not exceed spec!
page 01 of the manual "Ensure input voltage does not exceed 100 VDC to prevent permanent damage. Use the Open Circuit Voltage (Voc) to make sure the voltage does not exceed this value when connecting panels together."
Overpowering is done cuz ya get more power during non peak sun hrs, like morning, dirt, clouds, poor angle, shade and on and on. You can't go over 1040w or you exceed spec!
When the controller is limiting power it operates at last know MPPT (ON) and Voc (off). Note that Voc is a moving target with temperature and will likely never be observed unless extremely COLD with full light.
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Post by goingoffgrid on Dec 18, 2019 16:00:09 GMT
Overpowering is done cuz ya get more power during non peak sun hrs, like morning, dirt, clouds, poor angle, shade and on and on. You can't go over 1040w or you exceed spec! That makes no sense to me...are you saying you get more power during low sunlight conditions???
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Post by bupkis on Dec 18, 2019 21:27:16 GMT
During times of poor lighting like in the morning or crappy weather 3000w of panels may not even make 1000w.
Take 1500w that makes 1000w in perfect midday conditions, it makes more than 1000w would @ 9am, 4pm etc. There may be days 1500w exceed 1000w at midday but earlier and later in the day it might not exceed 1000w ie 1500w > 1000w.
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Post by playersz28 on Dec 23, 2019 16:12:22 GMT
I'm running 640w into a Rover 40 on a fifth wheel trailer I queried my database and in the afternoon of Feb 15th last winter we were in Anza Borrego and for 2 one minute periods the system was just over 40A charge current.
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obi81
Solar Newcomer
Posts: 9
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Post by obi81 on Jan 6, 2020 16:47:09 GMT
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