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Post by rabird on Oct 18, 2017 20:18:05 GMT -8
what do the eff curves at the end of the manual suggest?
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Post by tattoo on Oct 19, 2017 7:05:29 GMT -8
what do the eff curves at the end of the manual suggest? Ok as far as I can figure it... 36v is 96.5% eff at 260w..... That's peek.... Now is that 36v to the battery from the CC? And the 255w is the panels going to the CC? Or is it both v and w from the panels to the CC? |
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Post by rabird on Oct 19, 2017 8:52:58 GMT -8
12v batt system, 36v would be 2 12v panels or strings of 2 12v panels at a Vmp of 18v, page 10 says 2 is best, max 4 as guidelines. cuz converting from higher voltages makes heat and is less eff, they stop that chart @ 4 panels or Vmp of 72v.
The wattage is panel input which varies with sun etc, 255w @ 36v input. = 7A, converted to batt voltage
255 *.965 = 246v
converted to batt V of 12v, 246/12 = 20.5A to the battery
converted to batt V of 13v, 246/13 = 18.9A
converted to batt V of 14v 246/14 = 17.6A
there are charts for 24v system, etc.
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Post by tattoo on Oct 19, 2017 13:41:34 GMT -8
Ok Bird, On page 11 it also says that it's Max charge rate of 800w @ 12v and a max of 2400v @ PV array. So that's how they are getting by selling 8 panels that are in two strings of 4 panels each? Am I right?
With that said what I'm considering is with this 60aCC I'm going to run two strings of three panels and have a total of 6 panels not 8..
The main reason I'm doing this is at this time of year I'm only getting about 2.5 hours of sun with no obstructions from trees...... In your opinion am I hurting or helping my system...
Since I added my two more batteries I don't think I am getting the batteries to float like I did with just 4..... But I have a lot more amp hours to play with....
Thanks for your help..
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Post by rabird on Oct 19, 2017 16:14:51 GMT -8
so 800w is the limit so no problem with 8 panels, clipping allows for more.
8x Voc = is too big for 100 watt panels can not be all in series.
They provide 2 splinters for 2 strings to get Voc down below limit.
That is how they use 800w but stay below the Voc input limit. add another string and Voc doesn't change, more power!
changing controllers won;t add power, changing from series to series/parallel won't add power. Adding power adds power.
Ya might increase controller eff a tab and loose it in voltage drop.
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Post by tattoo on Oct 19, 2017 16:27:35 GMT -8
I'm changing the controller so I can add panels to get more power... So adding panels is how you get more power right?
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Post by rabird on Oct 19, 2017 17:06:35 GMT -8
yes
"With that said what I'm considering is with this 60aCC I'm going to run two strings of three panels and have a total of 6 panels not 8.. "
does that suggest more power?
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Post by tattoo on Oct 19, 2017 17:35:47 GMT -8
Yes it does that's why I'm upgrading to a 60aCC and now that I'm understanding this much better if I have the room I'm going to 8 Panels.....
Thanks for your help.... Damn this crap shouldn't be this hard........ LOL
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Post by Jimmy on Oct 20, 2017 13:34:46 GMT -8
Just ordered 6 panels on amazon from Renogy. It says shipped from Renogy. I live in Florida. The charged me $44 dollars tax. I asked about that because Renogy is in CA. I never have been taxed on anything unless it is made in florida. I talked to renogy they said I should not have been taxed. They said look at the invoice it says from Amazon llc. They said talk to amazon and I did. They are now taxing things you buy. 4 other items I bought were not taxed.
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Post by tattoo on Oct 20, 2017 15:52:37 GMT -8
Yep I understand Amazon is now charging sales tax... They are where I live also..... That's why I buy off of ebay no tax yet....
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Post by rabird on Oct 20, 2017 17:05:08 GMT -8
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Post by Jimmy on Oct 21, 2017 11:12:12 GMT -8
rabird thanks for the info. I hear that you should not mix panels. It confuses the mppt controller. I started with renogy I need to finish with renogy. I have 1 eco panel and the specs are not the same, they are both 100 watt but the volt and amp are different. I will check out solar blvd to see if they have the same specs. I still have time to cancel the order the haven't shipped yet.
Also you confuse me as to why you are going up to 60 amps. Why don't you buy 1 more battery and run at 24 volts. I have been running 800 watts of panel for 2 years on 40 amp mppt. The 60's are real expensive. Will your inverter handle 24 volts?
Ps. I'm going to 1500 watts with a 60 amp. Renogy's 60 commander $450 wont accept lithium battery which I expect to use in the future. I ordered a Must 60amp Mppt for $259 which will do solar. No reviews but Ill take a chance and send it back if it doesn't work.
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Post by tattoo on Oct 21, 2017 12:19:38 GMT -8
Jimmy I'm not sure if you are also talking to me?? If so my inverters are both 12v, so a 24v set up is out since I have a 2000w and a 500w 12v inverter now..... The main reason I'm going up to a 60aCC is I need more power at this time and I want to build another system at my shop so I'm taking the 40a CC there... Also a 40a service will work great at my shop as it gets full unobstructed sun all day and they are at a better angle to boot, unlike where the 40aCC is now it only gets about 2.5 hours unobstructed sun if I'm lucky this time of year....
I think it will be much better all the way around.....
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Post by Jimmy on Oct 22, 2017 16:02:46 GMT -8
I guess the question is which is cheaper and better in the long run. The cost of a new 24 volt inverter or the cost of 60cc.
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Post by tattoo on Oct 22, 2017 16:23:36 GMT -8
I guess the question is which is cheaper and better in the long run. The cost of a new 24 volt inverter or the cost of 60cc. If your just considering only the inverter or the 60aCC... The inverter is cheaper.... But in my case I'm building a completely separate system.. You know like starting from scratch with only a 40cc so a 24v inverter might work for that system.... By the way I was thinking I have 2 12v inverters now a 2000 and a 500 so a 24v inverter would cost more in the long run... |
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