Dry_Reef Posted August 29 Share Posted August 29 Hi guys. I am in the process of upgrading my system. The new installed inverter in the Sunsynk 8kw. it does have 2 strings. I am keeping my old panels on one string and will expand panels on the other string. What I wanted to know, well is many things…. Current panels are 330w ,47v, 9.38a x12 panels old inverter only had a single mppt and they were all connected. But I am not sure how… I would like to try use all of them since I have them & on a single string. I know in series they will over power at 564v and ideally should be aiming for 370v i can see that 8 panels in series is 376v so pretty close. Presumably for efficiency this is best. However in cloudy / shadow may have a problem. Paralleled of 6 each should help but then my voltage is only 282v. However all panels would be used. Whats the negative of this lower voltage ? Would it pick up actual detected sunlight later same for sunset as there are not as many volts ? Is there a possibility of running these in a series and parallel combination ? eg 8 in series and only 4 of those have a parallel connection but then voltage is right and some shading tolerance built in. I will be buying more panels for the 2nd string but that’s a whole other conversation. Any help will be appreciated. Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted August 29 Share Posted August 29 5 hours ago, Dry_Reef said: Hi guys. I am in the process of upgrading my system. The new installed inverter in the Sunsynk 8kw. it does have 2 strings. I am keeping my old panels on one string and will expand panels on the other string. What I wanted to know, well is many things…. Current panels are 330w ,47v, 9.38a x12 panels old inverter only had a single mppt and they were all connected. But I am not sure how… I would like to try use all of them since I have them & on a single string. I know in series they will over power at 564v and ideally should be aiming for 370v i can see that 8 panels in series is 376v so pretty close. Presumably for efficiency this is best. However in cloudy / shadow may have a problem. Paralleled of 6 each should help but then my voltage is only 282v. However all panels would be used. Whats the negative of this lower voltage ? Would it pick up actual detected sunlight later same for sunset as there are not as many volts ? Is there a possibility of running these in a series and parallel combination ? eg 8 in series and only 4 of those have a parallel connection but then voltage is right and some shading tolerance built in. I will be buying more panels for the 2nd string but that’s a whole other conversation. Any help will be appreciated. Use your current 12 in a 6 series in parallel with another 6 in series string on the 1st MPPT. 2nd new set of panels perhaps 8-9 depending on panels all in series to the 2nd MPPT. Quote Link to comment Share on other sites More sharing options...
Dry_Reef Posted August 29 Author Share Posted August 29 Thanks for the reply. So am I correct in saying. This would be 6x330w=1980w max power On my old inverter I used to get the full 3900w. Just not sure of how that was strung together on a single string. Suppose that would work quite well with shading etc for early mornings and late afternoons Quote Link to comment Share on other sites More sharing options...
Scorp007 Posted August 29 Share Posted August 29 28 minutes ago, Dry_Reef said: Thanks for the reply. So am I correct in saying. This would be 6x330w=1980w max power On my old inverter I used to get the full 3900w. Just not sure of how that was strung together on a single string. Suppose that would work quite well with shading etc for early mornings and late afternoons It will still be 12x330W when used as 6S2P for MPPT1. Without knowing what inverter you have used up to now we cannot guess how the 12 panels were wired. Quote Link to comment Share on other sites More sharing options...
TaliaB Posted August 29 Share Posted August 29 (edited) The op mentioned he now wants to use Sunsynk 8 kw. You have 2 mppt's that can accommodate 4 strings between 2 mppt's. So you will have 2 x 6 series strings connected to mppt 1 ( 4 wires 2 pos 2 neg) The 2 series strings is paralleled when connected to the scc. Your input power on mppt 1 will be 3960wp. Edited August 29 by TaliaB Quote Link to comment Share on other sites More sharing options...
Dry_Reef Posted August 30 Author Share Posted August 30 12 hours ago, TaliaB said: The op mentioned he now wants to use Sunsynk 8 kw. You have 2 mppt's that can accommodate 4 strings between 2 mppt's. So you will have 2 x 6 series strings connected to mppt 1 ( 4 wires 2 pos 2 neg) The 2 series strings is paralleled when connected to the scc. Your input power on mppt 1 will be 3960wp. Thanks Guys. That's more than I thought it would do. That will be perfect for that string. Quote Link to comment Share on other sites More sharing options...
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