Going Solar in Melbourne (Not far from the Victoria market) are an established solar dealer. They have been in the industry for decades and have a wide range of equipment. Expect to pay a little under $10 per peak watt. To determine the charging current from a typical panel divide the wattage by 18 (peak power is delivered around that voltage) so you can expect around 4.5 amps in full sun at noon from an 80 watt panel. On a typical summers day if you get sunshine all day in Victoria you could expect to get around 35 amp hours in to a battery from an 80 Watt panel.