The Electrical Power Subsystem of SRMSAT is responsible for generating, conditioning and distributing electrical power to all subsystems in an efficient way. Power production is done from three body mounted solar panels. The power bus is a battery tied bus and bus voltage varies from 6.4 V to 8.4 V. Power is distributed to the loads through the converters which also condition the power according to the loads. A 7.2 V, 4.4Ahr battery is used along with a battery protection unit. Excess power, if any, is shunted by the shunt regulator. The system design provides a semi autonomous protection against any faults in the loads/subsystems with the help of current sensors and relay switches. The overall scheme has been shown in fig. 1. There are separate power grounds for the unregulated regions (Solar panels and batteries) and the regulated region (Regulators and the loads). Structure, which is grounded by interconnecting with braid wires, has the reference grounding point.