Housted, on June 30, the sun is slightly south of the northern tropic. I think you meant March 20 or Sept 20. Those are the days the sun is directly over the equator.
Time of year (hours of daylight) has a LOT to do with how much charge you are getting as well as angle of the sun.
By the way, our Victron monitor once indicated a max of 1204 watts out of our (at the time) 1200 watts of panels. That was late May at an altitude of nearly 8000' in west central Arizona.
Unfortunately, with our residential fridge at this time of year, we don't get a full charge and need to run the genny about every 3 days. We pull about 20 amps per hours (480 ah per 24 hours that the solar has to put back into the batteries).