Posted January 17, 20223 yr I am looking to install a 5kW Sunsync for a friend. Due to the roof construction, we can only fit 15 PV panels. 5 North facing, 5 East and 5 West. I said that we should keep the 5 PV North facing on one MPPT input and parallel the 5 East and West into the 2nd MPPT. Yes, there would be times that the PV could deliver more than the rated 11Amps, but his load is so small, it should not be a problem. Now the supplier of the inverter advised that he should rather run the East West strings in series? Would this actually work? My understanding is that shading of any of the series panels would cause huge generation losses?
January 17, 20223 yr 1 hour ago, Wetkit said: I am looking to install a 5kW Sunsync for a friend. Due to the roof construction, we can only fit 15 PV panels. 5 North facing, 5 East and 5 West. I said that we should keep the 5 PV North facing on one MPPT input and parallel the 5 East and West into the 2nd MPPT. Yes, there would be times that the PV could deliver more than the rated 11Amps, but his load is so small, it should not be a problem. Now the supplier of the inverter advised that he should rather run the East West strings in series? Would this actually work? My understanding is that shading of any of the series panels would cause huge generation losses? Note that the 5K Sunsynk's MPPT can take 13A not only 11A. What panels are you considering?
January 17, 20223 yr 15 hours ago, Wetkit said: I am looking to install a 5kW Sunsync for a friend. Due to the roof construction, we can only fit 15 PV panels. 5 North facing, 5 East and 5 West. I said that we should keep the 5 PV North facing on one MPPT input and parallel the 5 East and West into the 2nd MPPT. Yes, there would be times that the PV could deliver more than the rated 11Amps, but his load is so small, it should not be a problem. Now the supplier of the inverter advised that he should rather run the East West strings in series? Would this actually work? My understanding is that shading of any of the series panels would cause huge generation losses? Yes you get suppliers and suppliers. When connecting in series you will only yield the lowest yield of each string. In the morning west will be low and vice versa in the afternoon. As in parallel you need the 4 wires and just connect it in series and check the yield and then change it to parallel. The proof of the pudding............
January 18, 20223 yr Author 18 hours ago, Scorp007 said: Yes you get suppliers and suppliers. When connecting in series you will only yield the lowest yield of each string. In the morning west will be low and vice versa in the afternoon. As in parallel you need the 4 wires and just connect it in series and check the yield and then change it to parallel. The proof of the pudding............ Yes, this was my exact suggestion to the client as well. PV is rated 400W @ 47.2Voc and 38.7Vmp. 10.34Imp. Regarding the MPPT ratings, on this 5kw Sunsync unit it says 11Amps.
January 18, 20223 yr 1 hour ago, Wetkit said: Yes, this was my exact suggestion to the client as well. PV is rated 400W @ 47.2Voc and 38.7Vmp. 10.34Imp. Regarding the MPPT ratings, on this 5kw Sunsync unit it says 11Amps. On another topic it was mentioned the inverter max is now 13A and not 11A as we still see in spec sheets.
January 18, 20223 yr 2 hours ago, Wetkit said: Regarding the MPPT ratings, on this 5kw Sunsync unit it says 11Amps. 34 minutes ago, Scorp007 said: On another topic it was mentioned the inverter max is now 13A and not 11A as we still see in spec sheets. There is a good chance that a firmware update will change that specification. Mine is also labelled 11A, and after a firmware update it was capable of 13A. Get your installer to send the serial # of the inverter to the Sunsynk Whatsapp support group, Sunsynk can confirm whether the hardware can do 13A or not, and get the update.
January 18, 20223 yr On 2022/01/17 at 7:23 AM, Wetkit said: I am looking to install a 5kW Sunsync for a friend. Due to the roof construction, we can only fit 15 PV panels. 5 North facing, 5 East and 5 West. I said that we should keep the 5 PV North facing on one MPPT input and parallel the 5 East and West into the 2nd MPPT. Yes, there would be times that the PV could deliver more than the rated 11Amps, but his load is so small, it should not be a problem. Now the supplier of the inverter advised that he should rather run the East West strings in series? Would this actually work? My understanding is that shading of any of the series panels would cause huge generation losses? The only issue with the parallel East/West config is you double the current which takes it up to 20.68A and the 5kw Sunsynk will only allow 13A through its MPPT. 20.68A less 13A is 7.68A x 38.7V x 5 is a loss of 1486w. 1468w at R6 per w is almost R9000 to just throw away. Try installing possibly a higher wattage panel on the north and West Edited January 18, 20223 yr by Leshen
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