solar calculator

Calculate your solar panel size, battery capacity and inverter needs in minutes. This South African solar calculator shows exactly how many panels you need, how much battery backup to install and the total power your system must deliver. Use it for homes, shops or small businesses. Enter your usage and get instant results.

ELECTRICITY SPEND TO KWH ESTIMATOR (OPTIONAL)

Don't know your daily kWh? Enter your monthly Rand spend and we'll estimate it. The result will fill the "Units per day" field below.
Estimated Monthly Usage
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Estimated Daily Usage
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Average Cost Per kWh
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INSTALLATION ADDRESS

Select your location to estimate Peak Sun Hours (PSH).

SOLAR PANEL SIZING (24H BASE)

Typical residential panels: 450W, 550W, 565W, 600W.
Panel orientation: -, Sun capture: - Select Direction
NESW
Tip: North works best in South Africa. East and West still work.
0 degrees = flat, 90 degrees = vertical. Typical: tile 20 to 25, IBR 10 to 15.
Recommended Fixed Tilt degrees (year-round)
Roof tilt: - degrees, Difference: - degrees, Sun capture: - Insert Tilt
Green line shows best angle. Dark panel shows your angle.
Daily usage
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Required panels
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Array size
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BATTERY SIZING FOR NIGHT USE

Based on use from 17:00 to 08:00, 15 hours total.
Capacity per battery module.
Night avg. power
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Required battery
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Battery modules
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Solar Calculator South Africa

Use this solar calculator to determine your ideal system quickly.

The tool works as a full solar panel calculator for homes.

Get accurate battery size and panel requirements in seconds.

Our photovoltaic panels calculator shows exactly how many panels you need.

Use the PV panel calculator for precise kWh calculations.

The calculator recommends inverter size based on your load.

Designed for South African conditions and local sunlight data.

Try it now and get an instant system summary.

How it helps

  • Calculate required solar panels and total system kW quickly.
  • Estimate battery capacity in Ah or kWh for backup needs.
  • Find recommended inverter size for peak and continuous loads.
  • Compare system options for homes and small businesses.

Quick tips

  1. Enter your daily kWh usage for best results.
  2. Include peak loads to size the inverter correctly.
  3. Adjust autonomy days to size the battery properly.
  4. Use local solar irradiance values for accuracy.

Related pages

Solar panels |
Batteries |
Inverters

Secure Payments

We accept secure EFT and Visa card payments for your convenience.

Warehouse Collections

Warehouse collection at selected locations in South Africa, example: Cape Town and Durban

Our certified solar team is ready to guide you, 7 days a week.

Exclusive Deals

Save with bundle discounts on inverters, batteries, and solar panels.