I asked a solar company to install some panels that were supposed to be split between my house and my daughter's to be built house. The panels were going to go on my roof as her roof was going to be shaded for much of the day. Now my roof has a 10 degree pitch using a vertical seam metal roof with the seams running NW to SW. Initially I asked for the panels to be flat mounted against the roof to reduce the wind on the roof, and that's what my contract says.
But the installers have rack mounted them at an approximate 40 deg angle facing north east.
I think 12 panels (300W) are mine, and 8 panels are the daughter, and we have 14.4 kWh of lead carbon batteries (8 batteries) shared between us, with two Solax hybrid inverters.
My location is about 41.3° S, 174.7° E
Now this my 3rd day with the system active, and it's just after 4 pm, and I expect by 5:30 pm the solar production will drop to neglible levels as the sun will then be behind the panels. The whole morning was a miss as it was clouded over until midday.
So, my question is, does one get more sun light with the panels as flat as possible (allowing some inclination for self cleaning), or is the production higher with the panels pointed north thereabouts (in the Southern Hemisphere). The other consideration is that with a large amount of solar generation the batteries can only be charged at a certain rate and excess is exported to the grid. So, wouldn't I have been better off with lower peak production spread over the day?