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Silicon does not like heat. Performance improves at low temperatures quite dramatically. Direct sunlight heats the panels.
While a North aspect is best. East is next, losing 10%, while the West aspect has more heat and is 1- 5% less efficient than East
A small shadow over one cell will reduce that panel output significantly. The cells are in series. One cell resistance goes high and panel output is limited by that cell. So watch for bird droppings.
As Summer comes on the angle of incidence will change. Less reflection off the glass surface. @ 12 degree pitch in Southern Victoria will have significant affect on the efficiency. To improve, a pitch kit will increase output. Be aware not to unplug any DC cables under load. Big arcs and sparks. (carries around 200 - 500volts)
To have it done by qualified techs is expensive and not worth the extra outlay for that extra 500w
Ideally the panels should be positioned so that they are at 90degrees to the sun's rays.
Cheers
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