Cyon Posted September 7, 2020 Share Posted September 7, 2020 Hello. So was busy with a my final setup and I didn't think and cut both the positive and negative cables (wheal the one 3s was connect)together and cause a short. Did I just lost my 3 Panels? Quote Link to comment Share on other sites More sharing options...
Coulomb Posted September 7, 2020 Share Posted September 7, 2020 1 minute ago, Barryv said: Did I just lost my 3 Panels? I don't think so; panels are current limiting. Hopefully the inverter was off or isolated at the time, so that should not be an issue. You might need a new pair of cutters though Quote Link to comment Share on other sites More sharing options...
Cyon Posted September 7, 2020 Author Share Posted September 7, 2020 2 minutes ago, Coulomb said: Hopefully the inverter was off or isolated at the time, so that should not be an issue. hahah no. everything was off and not connected. 2 minutes ago, Coulomb said: You might need a new pair of cutters though hahha no. Why I say, I don't get 135v from the 3 panels but only 118 volts and 330 watts +, my panels is 3x 330 panels is in series. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted September 7, 2020 Share Posted September 7, 2020 3 minutes ago, Barryv said: Why I say, I don't get 135v from the 3 panels I note that 135 V on a King will enforce a 67% maximum power from the solar charge controller (power derating starts at 130 V, and goes to zero at 145 V). Quote but only 118 volts and 330 watts +, Presuming that it would have been around 3:30pm local time (give or take a bit because one time zone in SA isn't optimal for solar calculations), that might be normal; you'd have to check with logs from other days. It might be worth checking each panel separately. Quote my panels is 3x 330 panels is in series. 3S of 72-cell panels, into a 145 V absolute max solar charge controller. It's so common, and so wrong. It will bite you eventually. Please consider rewiring for 2S. Quote Link to comment Share on other sites More sharing options...
Cyon Posted September 7, 2020 Author Share Posted September 7, 2020 5 minutes ago, Coulomb said: 3S of 72-cell panels, into a 145 V absolute max solar charge controller. It's so common, and so wrong. It will bite you eventually. Please consider rewiring for 2S. I have 4 panel on the roof now. can I connect them in 2 series and then in parallel ? Quote Link to comment Share on other sites More sharing options...
Coulomb Posted September 7, 2020 Share Posted September 7, 2020 Just now, Barryv said: I have 4 panel on the roof now. can I connect them in 2 series and then in parallel ? Yes; 2S2P. You should have rooftop fuses on each string (unless you end up with just the two strings for a long time). Quote Link to comment Share on other sites More sharing options...
Cyon Posted September 7, 2020 Author Share Posted September 7, 2020 1 minute ago, Coulomb said: Yes; 2S2P. You should have rooftop fuses on each string (unless you end up with just the two strings for a long time). I have fuses in my box but I want to get the fuses for the roof, but they just expensive at mantech Oh and I don't have them at the right directions as of my roof not pointing north, the side that does point north has to much shadows. Quote Link to comment Share on other sites More sharing options...
Cyon Posted September 7, 2020 Author Share Posted September 7, 2020 7 minutes ago, Coulomb said: Yes; 2S2P. You should have rooftop fuses on each string (unless you end up with just the two strings for a long time). What is the best setup/layout for my King inverter? we going to get next month more panels. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted September 7, 2020 Share Posted September 7, 2020 1 hour ago, Barryv said: What is the best setup/layout for my King inverter? we going to get next month more panels. For almost any modern panel, including all 72-cell (and 144 half-cell) panels, it will turn out to be 2S. For the monster 400+ watt panels with more than 72 cells in series, you have to do the calculations. Rule of thumb: total number of cells in series x 0.7 V should not exceed 145 V (for the 145 V absolute max SCCs, obviously). For the 60-cell panels, 3S is best, unless they are particularly high voltage panels. Again, for 145 V max SCCs, such as in the Axpert King and Axpert MKS (not MKS II) models. Total number of panels should be such that the total nominal power is 4500 W or less. A tiny bit over 4500 W might be OK. Quote Link to comment Share on other sites More sharing options...
Jay-Dee Posted September 7, 2020 Share Posted September 7, 2020 4 hours ago, Barryv said: What is the best setup/layout for my King inverter? we going to get next month more panels. I had this argument with my original installer as they were insistent that 3 in series would be fine as at 39.4v per panel, this was MAX and it would not be an issue totalling 118.2 as the max on the inverter was 145v. From this forum... I can confirm, DO NOT go above 115v as the inverter will start limiting and clipping your production resulting in serious wastage, MPPT freezing and potentially inverter / MPPT damage long term. I initially had 4 panel configured in 2S2P which hit 80v almost every single day (i.e. slightly higher than rated). I have since expanded to 2S6P and still hit 80v almost every 80v during peak times. This config works very very well, great production and seems to be tolerant of partial shading. I am glad I never listened to the original installer re 3S configure and stuck to my guns re 2S config Good luck with the expansion Coulomb 1 Quote Link to comment Share on other sites More sharing options...
Cyon Posted September 7, 2020 Author Share Posted September 7, 2020 22 minutes ago, Jay-Dee said: I had this argument with my original installer as they were insistent that 3 in series would be fine as at 39.4v per panel, this was MAX and it would not be an issue totalling 118.2 as the max on the inverter was 145v. From this forum... I can confirm, DO NOT go above 115v as the inverter will start limiting and clipping your production resulting in serious wastage, MPPT freezing and potentially inverter / MPPT damage long term. I initially had 4 panel configured in 2S2P which hit 80v almost every single day (i.e. slightly higher than rated). I have since expanded to 2S6P and still hit 80v almost every 80v during peak times. This config works very very well, great production and seems to be tolerant of partial shading. I am glad I never listened to the original installer re 3S configure and stuck to my guns re 2S config Good luck with the expansion What Inverter do you have @Jay-Dee? Quote Link to comment Share on other sites More sharing options...
Jay-Dee Posted September 8, 2020 Share Posted September 8, 2020 22 hours ago, Barryv said: What Inverter do you have @Jay-Dee? Axpert King 5K Quote Link to comment Share on other sites More sharing options...
Jay-Dee Posted September 8, 2020 Share Posted September 8, 2020 @Barryv.... you can have a look at my install here via the link below... If you have any question... fire away Quote Link to comment Share on other sites More sharing options...
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