General Procedure

if (eclipse){
	battery -> loads
}

else {

	while (!loads_enough_power){
		solar_cells -> loads
		
		do {
			battery -> loads
		} while (!loads_enough_power)
	
	}
	
	solar_cells -> battery;
}

There are only 2 states the CubeSat can be in: either in sunlight or without.

• During Eclipse
  • Loads depend fully on the batteries for power.
• During Sunlight
  • The priority is to power the loads, and there are 2 cases to consider:
  1. Solar power is enough for loads:
     1. Send solar power to loads, leftover power charges batteries
  2. Solar power is not enough for loads:
     1. Send all solar power to loads, get the remaining from batteries

Look at this page to get the components that we have to deal with: What is EPS?

Integrated Circuit Option

Integrated Circuit: BQ25798

• Functionality: This IC can charge the batteries, manage constant current and voltage from solar panels using MPPT, and monitor voltage, current, and temperature.
• Features: It supports 1-4 cell batteries, includes built-in MOSFETs, and operates efficiently with a wide input voltage range. It also includes a 16-bit ADC for precise monitoring and supports I2C communication.
• Link: Texas Instruments BQ25798

Discrete Components Option

Battery Charger: LTC4155

• Functionality: This IC handles efficient battery charging and provides detailed telemetry for battery management.
• Features: It includes PowerPath control for instant-on operation, ensures safety with temperature monitoring, and supports I2C for communication.
• Link: Analog Devices LTC4155 (Analog Devices)

Battery Fuel Gauge: MAX17048

• Functionality: This IC monitors battery state of charge, voltage, and can alert based on customizable thresholds.