☀ Gauteng Solar Estimate Tool

What Size Solar System Do You Need?

Select the appliances you want to run, add quantity and hours, then get a basic estimate for inverter size, battery storage and solar panel requirements. This helps you understand whether you need a small backup system, a 5kW home system, or a bigger solar setup.

Start Calculator View Solar Specials

Estimate only. Final design depends on site inspection, roof space, DB board condition, cable distance, appliance startup loads, installation area and final quotation.

Solar panels installed for a South African home in Gauteng

South Africa Has the Sun — Your System Still Needs the Right Size

Solar works best when it is planned around real appliance use. A small backup system can keep essentials running, while bigger homes may need more inverter power, more battery storage and more panels for daytime loads.

This solar calculator helps Gauteng homeowners understand the difference between backup power, battery storage and daytime solar production. It is especially useful before asking for a quote because geysers, stoves, pumps and aircons can change the whole system size.

Essentials first Lights, WiFi, TV, fridge, freezer, alarm and gate motor.

Night load matters Batteries must carry loads after sunset.

Heavy loads need planning Geysers, stoves and heaters can push costs up fast.

Quote smarter Send your estimate to Prince Solar before final sizing.

Solar Load Estimate Calculator

Tick the appliances you want to run. You can add more than one usage group per appliance: for example, 14 LED globes for 8 hours and 6 LED globes for 4 hours.

Important: Some appliances have startup/surge loads that can be much higher than normal running watts. Pumps, compressors, fridges, freezers, aircons and power tools must be checked properly before final inverter sizing.

Your Estimate

Select Loads Choose appliances to start the estimate.

Total possible running load 0 W

Estimated daily usage 0 kWh

Night battery demand 0 kWh

Suggested inverter -

Suggested battery -

Suggested panels -

Start by selecting your loads

The calculator will recommend a basic system range after you add appliances and run times.

Compare with Specials

This is a basic estimate only. Final sizing depends on what runs at the same time and must be confirmed by Prince Solar Solutions.

Geysers, Stoves and Heavy Loads

Geysers and electric stoves can change the whole solar price. A good system is not only about adding more batteries — it is about planning what should run from solar, what should run from battery, and what should be moved to gas, timer control or daytime operation.

Why geysers need special planning

A geyser does not simply empty hot water. As hot water is used, cold water enters the tank. This reduces the remaining hot-water reserve and can require reheating later.

A 3kW element running 2 hours can use about 6kWh.
If it runs twice at night, that can become about 12kWh.
That can make the battery bank much bigger and more expensive.

Smarter geyser strategy

In South Africa’s strong sun, daytime geyser heating can work well if there are enough panels and the geyser is controlled properly. Timers can help prevent the geyser from heating at the wrong time.

Heat water during sunny hours where possible.
Keep batteries for night essentials.
Consider gas geysers, gas stoves, heat pumps or smaller controlled elements where suitable.

Not sure if your geyser should run on solar?

Ask Prince Solar Solutions to check your geyser, stove and battery loads before choosing a package.

Request a Quote

Plan the System Around the Loads That Matter

A proper solar quote must look at the actual home: what runs at night, what can run during sunny hours, what appliances create startup surge, and what must stay powered when the grid fails.

Solar panels for residential backup power

Solar panels for daytime production

Inverter and battery backup

Designed around real appliance use

Quote-ready load estimate

Use the calculator before choosing a package

A cheaper system can become expensive if the geyser, stove or night loads are ignored.

Open Calculator

Send Your Estimate for a Proper Solar Quote

Use the calculator first, then send your estimate on WhatsApp. Prince Solar Solutions can help confirm the correct inverter, batteries, panels and installation requirements for your site.

Ready to check your solar size?

Send your calculated load estimate and request a quotation.

Prices can change without notice. Final pricing depends on stock availability, site conditions, installation distance, travel, accommodation where required, roof type, cable distance, DB board condition and final system design.