Lesson 12 – O: Orient Your Learning: How Can We Design a Reliable Solar Mini-Grid for a Community?

O: Orient Your Learning

Trace Energy From Source to Service

See the Whole Energy System

A mini-grid is a system of connected components. Each part has a job, and the system works best when the parts are considered together.

A common solar mini-grid energy pathway can be represented as:

Solar array –> charge controller –> battery bank –> inverter –> priority loads

Component	Main Role in a Mini-Grid
Solar array	Converts sunlight into electrical energy.
Charge controller	Manages the approved movement of energy from the solar array toward the battery bank.
Battery bank	Stores electrical energy so it can be used later.
Inverter	Converts electricity into the form required by identified loads.
Priority loads	Use electricity to provide needed services.

The pathway helps engineers explain how energy is generated, managed, stored, converted, and used. It also helps teams identify where they need more information before making a claim about system performance.

Loads and Load Profiles

A load is a device or service that uses electrical energy. A load profile helps a design team organize what services need energy, when they may be used, and how their energy needs may differ.

A load profile does not make a final decision by itself. It helps teams ask better questions.

Service Pattern	What a Design Team Might Need to Consider
A service is needed throughout the day.	Whether available energy can support it over time.
A service is most important after sunset.	Whether stored energy may be needed.
Several people need the same service at once.	Whether demand may increase during busy periods.
A service is helpful but not essential.	Whether it should be reduced or deferred when energy is limited.

Think About It

Why is it important to know not only what a community wants to power, but also when, how long, and how important each service is?