To avoid conversion loss and exploit DC producing renewable resources, interest to develop DC power supply network for DC end-use applications is increasing. This is particularly applicable for data centres and computing/ networking systems. Motivated from DC system success stories at different places around the globe, Brisbane Airport Corporation (BAC) intends to investigate the possibility of a PV and battery powered DC power system for one of its maintenance buildings. Understanding load and solar PV generation pattern, availability of excess PV energy, required battery size and cost are among the preliminary steps before moving forward. This paper analyses solar production and building demand to determine battery size at current and prospective PV generation scenarios at the BAC facility. Based on the present market, two popular battery technologies (Li-Ion and VRLA) are considered. A simplistic financial analysis is also performed to compare investment with potential savings.