I have this configuration 7 x660W panels and sp5000 Growatt inverter. I can not get more than 13amps or 3300w anyone can help or explain why I can not reach the 4500W

 

What is the orientation of your panels? Are they all in series? 
Did you measure the incoming DC voltage with a multimeter to compare the expected voltage with the actual.
There are many factors that will influence the solar production. Rule of thumb is around 80% to 90% of lab data in real life, assuming everything else is perfect, which it hardly ever is.
  

3 hours ago, zsde said:

What is the orientation of your panels? Are they all in series? 
Did you measure the incoming DC voltage with a multimeter to compare the expected voltage with the actual.
There are many factors that will influence the solar production. Rule of thumb is around 80% to 90% of lab data in real life, assuming everything else is perfect, which it hardly ever is.
  

Hello the orientation is correct and the total voltage at the inverter is the same as on the roof 290 out of 309

By orientation I meant azimuth and tilt as that has a direct impact on the solar production

1 hour ago, HUS said:

Hello the orientation is correct and the total voltage at the inverter is the same as on the roof 290 out of 309

The ideal production as indicated by @zsde

is about 3700W. Your 3300W is some 12% lower. Do not expect the lab output of 4600W in Gauteng and some other provinces. 

Do you have enough load and or lower SOC of battery as this will have a major affect on the PV output of panels.