Going Solar in South Africa: The Guide to Read Before You Sign a Quote

 

THE PULSE PILLAR GUIDE Energy Series

How home solar works in South Africa

How home solar works in South Africa, how to size a system, what the rules require and the costly mistakes to avoid before you buy.

For millions of South African households, electricity is no longer just a monthly bill. It is a decision about independence, cost and reliability. Rooftop solar has moved from a luxury to a mainstream option, and the market is crowded with installers, packages and promises. Some are excellent. Others leave customers with undersized systems, weak batteries and warranties that are hard to claim on.

This guide explains how a home solar system works, how to work out what size you need, what the rules require and how to compare quotes properly. It is written to be understood without technical training, and to be useful whether you are installing a small backup system or a full household solution.

In this guide

• The three types of solar system
• How to size a system for your home
• Batteries: what to look for
• The rules: registration, safety and insurance
• How to compare quotes
• Working out your payback
• Mistakes to avoid
• Frequently asked questions

The three types of solar system

1. Grid-tied (no battery)

Panels feed an inverter, which powers your home and sends any surplus to the grid, where your municipality allows it. This is usually the cheapest option and it cuts your bill during the day. The catch is that a standard grid-tied inverter switches itself off during a power outage for safety reasons, so it does not keep your lights on when the grid is down.

2. Hybrid (panels, inverter and battery)

A hybrid system adds a battery and a hybrid inverter. It can run your home from solar and stored energy during an outage, and it can recharge from the grid if needed. This is the most popular choice for households that want backup power as well as savings.

3. Off-grid

An off-grid system is fully independent from the grid. It needs larger battery storage and often a backup generator, which makes it the most expensive. It suits remote properties without a reliable connection and is rarely the best financial choice in a town or suburb.

How home solar works in South Africa

How to size a system for your home

Sizing is where many bad quotes go wrong. Start with your actual numbers rather than a package on a brochure.

1. Read your bills. Find your monthly electricity use in kilowatt-hours (kWh) over the past 12 months. This tells you how much energy you need to replace.
2. List what you want to keep running during an outage. Lights, fridge, Wi-Fi router, TV and laptops use little power. A kettle, oven, hairdryer, pool pump and electric geyser use a lot.
3. Add up the power (kW) and the energy (kWh). The inverter must handle the combined power of everything running at the same time. The battery must hold the energy you need for the hours you want backup.
4. Check your roof. North-facing roofs in South Africa generally give the best output, but east and west-facing roofs also work well. Shade from trees or neighbouring buildings can cut output sharply.

As a general guide, most of South Africa receives roughly four to six hours of strong, usable sunshine a day, varying by region and season. A well-installed panel array typically produces somewhere between about 1,400 and 1,800 kWh per kilowatt-peak (kWp) of panels each year, depending on location, roof angle and shading. Ask any installer to show their output estimate and the assumptions behind it.

The geyser question

An electric geyser is often one of the biggest single loads in a home. Running it from a solar system can drain a battery quickly. Many households get better value from a heat pump, a solar water heater, or a timer or diversion device that heats water when the sun is shining and batteries are full.

Batteries: what to look for

• Chemistry. Most modern home batteries use lithium iron phosphate (LiFePO4). They typically last for thousands of charge cycles, handle deep discharge well and need little maintenance. Traditional lead-acid batteries are cheaper up front but usually need to be replaced sooner and cannot be drained as deeply.
• Usable capacity. A battery's headline kWh figure is not always what you can actually use. Ask for the usable capacity.
• Warranty. Check the length, the number of cycles covered and who handles claims. A warranty from a company that may not exist in five years is worth less than it looks.
• Compatibility. The battery and inverter must communicate properly. Mismatched equipment is a common source of faults.

The rules: registration, safety and insurance

Solar is regulated, and cutting corners can put your home and your insurance at risk.

• Register with your municipality or Eskom. If your system can connect to the grid, it generally needs to be registered as small-scale embedded generation (SSEG). Rules, fees, meters and feed-in arrangements differ between municipalities, so ask yours before you install.
• Use qualified people. The installation should be done or signed off by a qualified electrician, and you should receive an electrical Certificate of Compliance. Industry quality schemes such as the PV GreenCard are worth asking about.
• Tell your insurer. Declare the system and confirm in writing that it is covered, including against theft and lightning damage.
• Check the tax position. Tax treatment of solar investments has changed over time, so confirm what applies to you with SARS or a tax practitioner before relying on any promised deduction.

How to compare quotes

Always get at least three itemised quotes. A single price for a "package" hides too much. Compare these points side by side:

• Panel brand, wattage and number of panels, and the total kWp.
• Inverter brand, power rating and whether it is hybrid.
• Battery brand, usable kWh, cycle life and warranty.
• Cost per kWp installed and cost per usable kWh of battery. These two figures make quotes easy to compare.
• What is included: mounting, cabling, surge protection, isolators, the Certificate of Compliance and registration paperwork.
• Monitoring: can you see production and usage on your phone?
• After-sales support: who do you call when something fails, and how fast do they respond?

Working out your payback

The basic maths is simple. Annual saving equals the kWh your system produces and you use, multiplied by your electricity tariff. Payback time equals the total cost divided by the annual saving.

An illustration only: if a system produces 7,000 kWh a year and your tariff is R3.00 per kWh, the saving is R21,000 a year. A system costing R140,000 would then take roughly six to seven years to pay for itself, before counting any tariff increases or battery replacement. Use your own tariff, output estimate and quote, because every home is different. Backup power during outages has a value that does not appear in this calculation, but it is real.

How home solar works in South Africa

Mistakes to avoid

1. Buying on price alone. The cheapest quote often uses lower-quality batteries, thin cables or leaves out surge protection.
2. Undersizing the inverter. If it cannot handle your peak load, it trips when the kettle and microwave run together.
3. Ignoring shade and roof condition. Repair a leaking roof before panels go on it.
4. Skipping registration. Unregistered grid-connected systems can lead to fines, insurance problems and problems when you sell.
5. Forgetting maintenance. Clean panels occasionally, check connections and keep an eye on the monitoring app.
6. Paying everything upfront. Agree on a payment schedule tied to milestones, and never pay the full amount before the system is commissioned.

Frequently asked questions

Will solar make my electricity bill zero?

Rarely. Most homes still draw some power from the grid at night or on cloudy days, and many municipalities charge fixed monthly fees regardless of use.

Can I sell power back to the grid?

In some municipalities, yes, but the rules, payments and technical requirements vary widely. Ask your municipality before you design the system around feed-in income.

How long do solar panels last?

Quality panels commonly carry performance warranties of 25 years or more. Inverters and batteries usually need replacing sooner.

Is a bigger battery always better?

No. A battery should match the energy you need during an outage, not the largest unit on offer. An oversized battery raises the cost without improving your daily savings.

Should I wait for prices to fall?

Equipment prices have fallen over the years, but the cost of waiting includes every month of higher electricity bills. The right time is when the numbers work for your household.

Join the conversation

Have you installed solar, or are you still deciding? Share your experience in the comments, and tell us what you would do differently. It helps other readers.

Read next in the Pulse Pillar Series: How the repo rate, inflation and the rand affect your wallet, How to build wealth on a South African salary and Opinion: Who controls the power switch controls South Africa's future.

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Source: ThePulse