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Solar and backup planning

Solar Estimator

Use your monthly electricity bill to get a rough starting point for system size and budget. Final sizing and pricing depends on roof space, DB condition, cable routes and load assessment.

01

Your starting point

Tell us how the property uses power.

R 1 800 p.m.

Estimated from your monthly electricity bill using a planning blended tariff of R3.80 per kWh.

Main goal
Refine the estimateSupply, daytime use, roof and larger loads
Supply type
Daytime usage
Roof type
Heavy loads
Planning estimate only

Recommended starting point

Backup and solar starting point

GJS must confirm the supply type at the DB or meter.

Roof type is assumed as tile for this estimate.

Estimated monthly use
474 kWh
Estimated daily use
15.8 kWh
Suggested inverter
5 kW single phase
Suggested battery
10.24 kWh
Suggested panels
6 × 620 W
Estimated solar size
3.72 kWp
Estimated daily solar
16.4 kWh

Budget guide ex VAT

R 70 000 to R 90 000Budget guide incl VAT: R 80 000 to R 105 000
Estimated monthly bill offsetR 945 to R 1 278
Estimated annual savingR 11 339 to R 15 341

Typical Loads Covered

  • Lights
  • Wi-Fi
  • Security systems
  • TVs
  • Computers
  • Fridges and freezers
  • Selected plug circuits
Typical examples only. Actual performance depends on load profile and final system design.

Additional Assessment Required

  • Electric ovens
  • Electric stoves
  • EV charging
  • Multiple air conditioners
  • Underfloor heating

Why This System Was Suggested

Your R 1 800 monthly bill suggests a small system that balances backup power with daytime solar savings. GJS still needs to confirm the supply type at the DB.

What GJS Still Needs To Verify

  • Supply type
  • DB condition
  • Essential load split
  • Cable routes
  • Roof space
  • Shading
  • Municipal requirements
  • Battery location
Send this estimate to GJSRead our solar sizing guide
  • Planning estimate only. The result is a starting point, not a quote.
  • GJS confirms final sizing and pricing after a site inspection and load assessment.
  • The estimate uses typical Cape Town solar conditions and a planning blended tariff. Actual usage, generation and savings vary.
  • Roof space, orientation, shading, DB condition, cable routes, supply type and municipal requirements can change the checked quote.
  • Three-phase, EV charging, commercial and larger systems require a site-specific design.