TriStar MPPT Solar Controller. Morningstar TriStar MPPT solar controller is an advanced maximum power point tracking (MPPT) battery charger for off-grid photovoltaic (PV) systems up to 3 kW. The controller provides the industry highest peak efficiency of 99% and less power loss compared to other MPPT controllers. The TriStar MPPT features a smart tracking algorithm that maximises the energy harvest from the PV by rapidly finding the solar array peak power point. Includes on-board Ethernet for a fully web-enabled interface and up to 200 days of data logging. TrakStar Technology Maximizes Energy Harvest Extremely High Reliability Very High Efficiency Extensive Networking and Communication Capabilities Metering and Data Logging Certified to IEC 62093. Applications:. Hybrid (PV + Second Energy Source) Railroad Signaling Residential Solar Security and Instrumentation Rural Electrification and Solar Home Systems Telecommunications