CTskollie Posted June 27 Share Posted June 27 Hi All I believe it's fine but thought let me rather confirm with you wise people, can I mix 550 JA Solar and 540W panels from the same line. The specs of the panels are as below, I want to add 6 550w panels to my existing 8 540w panels. it's currently connected 4 panels on each string and I'm thinking of adding 3 panels to each string. Will thus total 7 panels of each string. It's connected to an 8kw Sunsynk inverter, see panel specs below. Thank you guys. Quote Link to comment Share on other sites More sharing options...
TaliaB Posted June 27 Share Posted June 27 1 hour ago, CTskollie said: Hi All I believe it's fine but thought let me rather confirm with you wise people, can I mix 550 JA Solar and 540W panels from the same line. The specs of the panels are as below, I want to add 6 550w panels to my existing 8 540w panels. it's currently connected 4 panels on each string and I'm thinking of adding 3 panels to each string. Will thus total 7 panels of each string. It's connected to an 8kw Sunsynk inverter, see panel specs below. Thank you guys. It won’t be a problem just keep in mind the 550w panels will become a 540w panel as the Imp of the 550w panel will not be 13.11A but will become 12.97A. Very little difference but a difference nevertheless. CTskollie, ibiza and Derek3 3 Quote Link to comment Share on other sites More sharing options...
GreenFields Posted June 27 Share Posted June 27 Would it be a big deal to transfer the 8 existing 540W panels onto one string on MPPT1, and put all the 6 new panels in series on MPPT2? In the end the difference is small, but it could add up to just over 100kWh per year. Scorp007 1 Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted June 27 Share Posted June 27 2 minutes ago, GreenFields said: Would it be a big deal to transfer the 8 existing 540W panels onto one string on MPPT1, and put all the 6 new panels in series on MPPT2? In the end the difference is small, but it could add up to just over 100kWh per year. Luckily I saw your post as I was going to go as you indicated. Saved some typing. Quote Link to comment Share on other sites More sharing options...
CTskollie Posted June 27 Author Share Posted June 27 Thank you all for the responses, I thought it should be fine but just wanted to make sure. I still need to get the new panels installed so when I install then it may be an option to move the 8 on one string and the 6 on the other. I don't mind losing the 10w though, the 14 panels as it is is way above what I need. I'm just adding panels as pricing is great right nw and the extra panels is for the winter months. In ssummer the 8 panels was adequate as is but thinking of installing aircons so a win either way. Quote Link to comment Share on other sites More sharing options...
AndrewJdc Posted June 28 Share Posted June 28 Panel prices are really attractive. Wish i could add a few extra but no roof space. Quote Link to comment Share on other sites More sharing options...
TaliaB Posted June 28 Share Posted June 28 (edited) 11 hours ago, CTskollie said: may be an option to move the 8 on one string and the 6 on the other 14 hours ago, GreenFields said: Would it be a big deal to transfer the 8 existing 540W panels onto one string on MPPT1 You need to confirm if your installer used Mppt1 4s2p and left Mppt2 open. Then you can install the 6 x 550w run 1 string to mppt2 into string 1 input. Remember these mppt's have 2 string inputs/ mppt. 11 hours ago, CTskollie said: . I don't mind losing the 10w though, If you go with 7x mixed panels you will lose 60w x 5.5(winter sun hours) x 365 = 120.45kwh/ year as @GreenFieldssuggested. The choice is yours i am only advising. Edited June 28 by TaliaB Derek3 1 Quote Link to comment Share on other sites More sharing options...
FixAMess Posted June 28 Share Posted June 28 2 hours ago, TaliaB said: ou go with 7x mixed panels you will lose 60w x 5.5(winter sun hours) x 365 = 120.45kwh/ year Tech question: Is this not the maximum theoretical amount you could lose? The panels are only running at max output part of the day... I would in any case rather add the new ones onto their own string. Makes it easier to maintain, compare, fault find etc.. Quote Link to comment Share on other sites More sharing options...
TaliaB Posted June 28 Share Posted June 28 (edited) 1 hour ago, FixAMess said: The panels are only running at max output part of the day The reason i used 5.5h in my calculation in summer you would get around 6.5h location specific so i think for the purpose of this exercise it would be pretty close. Yes agree with seperate string for the 550w. Edited June 28 by TaliaB Derek3 and Scorp007 2 Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted June 28 Share Posted June 28 (edited) 7 hours ago, FixAMess said: Tech question: Is this not the maximum theoretical amount you could lose? The panels are only running at max output part of the day... For an answer the lower current panel will throttle during the whole day the way I see it. May be the way @TaliaB calculated taking the days full production is spot on. Edited June 28 by Scorp007 TaliaB 1 Quote Link to comment Share on other sites More sharing options...
TaliaB Posted June 28 Share Posted June 28 2 minutes ago, Scorp007 said: For an answer the lower current panel will throttle during the whole day the way I see it. Yes you are quite correct in essence the 550w panel becomes a 540w panel due to lower Imp flowing in the 540 panel and they are series connect in a string. Derek3 1 Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted June 28 Share Posted June 28 1 minute ago, TaliaB said: Yes you are quite correct in essence the 550w panel becomes a 540w panel due to lower Imp flowing in the 540 panel and they are series connect in a string. My reply was based on say at 09h the 550 can produce 400W @X amps the 540W would produce less amps and still throttle. Quote Link to comment Share on other sites More sharing options...
CTskollie Posted July 1 Author Share Posted July 1 Thank you all for the replies, i checked and its currently installed 4 panels on MPPT 1 and 4 on MPPT 2. I guess it won't be that hard to move the 8 550w panels to MPPT 1 and the 6 on MPPT 2 so will go with that option, 120kwh is quite a lot of Kwh to go to waste. Thank you all again for the input, hopefully new panels will come this week and installed by next week. Quote Link to comment Share on other sites More sharing options...
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