I original contacted Macarthur Solar, on recommendation of friend, to check my failed inverter. After service call they offered choice of two inverters to replace mine but recommended installing new 5 kW inverter & larger solar panels on a 6.6 kW system. I then sought further info from SolarQuotes who referred 3 installers :- Beyond Solar; GI Solar; & Charlie Sparks. Two provided quotes on varying solar system configurations, the third did not supply a quote. I found SolarQuotes a quite informative website and it was their detailed reviews of installers, panels and inverters that persuaded me to go with Macartur Solar.