What Size Solar System Do You Need? A Simple Guide

Getting the size right is the single most important decision in a solar project. Too small and you won't see the savings you hoped for; too big and you've spent money on capacity you don't use. Here's how to think about it.

Start with your electricity bill

Your bill shows how many units (kWh) you use per month and often your peak load. This is the foundation of sizing, a system is designed to cover a meaningful share of what you actually consume, not an arbitrary package.

Consider when you use power

Solar generates during daylight. If most of your usage is during the day (common for businesses, shops and daytime households), a system can offset a large portion directly. If your heaviest use is at night, batteries or net metering become more important to capture the value.

Decide your backup needs

Ask yourself: during load-shedding, what must keep running? Backing up essentials, fans, lights, internet, a fridge, needs far less storage than backing up air conditioners. Being clear about this keeps your system appropriately sized and affordable.

Check your available space

Panels need unshaded roof or ground area with good orientation. Available space can influence how large a system you can install, and how it's mounted.

Think about the future

Planning to add air conditioning, an EV, or expand your business? It's worth mentioning up front so your system can be designed with future expansion in mind.

Let the survey confirm it

These factors give a good starting estimate, but the final design is confirmed with a proper assessment of your usage, space and requirements. That's how you avoid both under-sizing and over-spending.

Share your electricity bill with us and we'll recommend the right system size for your needs.