I counsel looking to trim the trees if at all possible, but if not Microinverters or S/E with Optimisers function wonderful with some overshadowing. Annual rate estimates believe standard energy use of 4000kWh/yr to get a residential customer on a single charge tariff. Value estimates exclude solar feed-in tariff credits. https://citypointsolar.com.au/4-factors-to-consider-when-installing-solar/