SOLAR DECISION GUIDE

Is solar worth it in South Africa?

Solar can be worthwhile, but there is no single payback period that applies to every South African home. The answer depends on what you use, when you use it, how much backup you need and whether the quote models your real electricity costs.

The safest way to decide is to compare a system against your own usage and tariff information rather than relying on a headline saving or a generic package price.

Solar is usually solving more than one problem

Most households consider solar for a combination of reasons:

• reducing electricity bought from the grid;
• keeping selected circuits running during an outage;
• reducing exposure to future tariff increases; or
• making better use of daytime solar generation.

A system designed mainly for bill reduction is not necessarily the right system for whole-home backup. Backup requires the installer to identify essential loads, inverter capacity and the battery reserve you actually need.

Five questions to answer before comparing payback

1. How much electricity do you use? Use recent bills and, where possible, interval or monthly usage data. A larger inverter does not automatically produce a faster return.
2. When do you use it? Daytime loads can use solar directly. Evening loads may require a battery, and charging a battery from the grid changes the economics.
3. What must stay on during an outage? List the fridge, lights, internet, security equipment, pumps and other essential circuits separately from high-load appliances.
4. What will remain on the bill? Fixed charges, municipal rules, export arrangements and usage outside solar hours can affect the result.
5. What assumptions are in the quote? Ask for the estimated yield, losses, shading, self-consumption, battery depth of discharge and maintenance assumptions in writing.

Solar panels and batteries answer different questions

Panels generate electricity when there is usable sunlight. A battery stores energy for later, but it also adds cost, conversion losses and replacement considerations. If your main objective is daytime bill reduction, adding more battery capacity may not be the best first step. If your main objective is backup, panels alone will not keep selected circuits running at night.

Read our guide to adding a battery to existing solar before comparing battery quotes.

How to compare two solar quotes fairly

Do not compare only the system size or total price. Put the quotes side by side and check:

• panel and inverter models, quantities and warranties;
• battery usable capacity, not only headline capacity;
• assumed daily usage and expected annual generation;
• backup circuits and stated runtime assumptions;
• installation, protection, monitoring and compliance work;
• what happens if roof work, cable runs or municipal requirements add cost.

A useful quote should show how its savings estimate was calculated. If the installer cannot explain the assumptions, treat the payback figure as a sales estimate rather than a forecast.

When solar may not be worth it yet

Waiting or starting with a smaller system can be sensible if you rent, plan to move soon, have limited roof space, use very little electricity, need substantial structural work or cannot yet compare the available quotes. A smaller, well-matched system may be more suitable than buying the largest package offered.

A practical next step

Collect your latest electricity bills, write down the appliances that must work during an outage and request quotes that show their assumptions. Then compare the proposals using the same usage profile. You can also review our South African solar cost guide and province-by-province solar potential guide.