Apollo Solar's technical training session focuses on the installation and operation of their True Sine Wave (TSW) inverter/chargers, highlighting their efficiency and ease of use. The training covers off-grid power system design, safety precautions, and the various configurations available for the inverters, including mounting options and remote monitoring capabilities. The document outlines specifications for the TSW3224 and TSW4048 models, detailing their power ratings, voltage configurations, and key components for effective operation.