don't understand clipping results

  • Arkadiusz Blonski
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07 Jan 2024 16:46 #12808 by Arkadiusz Blonski
don't understand clipping results was created by Arkadiusz Blonski
i did run simulation for 410 alpha pure r with different IQ8 inverters. results are surprising as IQ8M (midlde version) is resulting in lowest production.
i checked clipping by our and generally clipping is between 9AM and 11AM. why are clipping results not correlated with maximum AC power?
thankstimeSum of IQ8+ Inverter clipping loss AC power limit | (kW)Sum of IQ8M Inverter clipping loss AC power limit | (kW)Sum of IQ8A Inverter clipping loss AC power limit | (kW) 08:00 am                                     1,0                                     5,4                                     0,4 09:00 am                                  24,1                                  44,8                                  16,8 10:00 am                                  47,4                                  71,8                                  37,6 11:00 am                                  37,0                                  58,0                                  28,8 12:00 pm                                     6,2                                  18,9                                     3,5                                 115,7                                199,0                                  87,1Minimum MPPT DC voltage                                      27                                      30                                      32Maximum AC power                                    349                                    325                                    290


 

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  • Paul Gilman
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18 Jan 2024 19:09 #12830 by Paul Gilman
Replied by Paul Gilman on topic don't understand clipping results
Hi Arkadiusz,

Whenever the calculated AC output exceeds the inverter's rated AC capacity, SAM sets the inverter output to the rated capacity.

Note that SAM also models DC voltage clipping, so if the array voltage exceeds the inverter maximum MPPT voltage rating, SAM sets the DC operating voltage to the maximum MPPT voltage rating.

If you need help troubleshooting, please attach a .sam file that illustrates the results you are seeing.

Best regards,
Paul.

 

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