Estimate your solar savings.

An indicative system size, savings, payback and return, sized to your daytime demand and roof area for South African C&I rooftop installations.

Method: annual consumption is estimated from the monthly bill, assuming 70% of the bill is energy charges, divided by the per-kWh energy rate. Daytime demand depends on the operating profile (weekdays 60%, trading 7 days 60%, continuous 24/7 45%). The system is sized to 90% of daytime consumption or the available roof area, whichever is smaller, in whole 620 W panels.

Modelled on: Tier-1 panel 620 W · Performance ratio 0.80 · Energy share of bill 70% · Daytime demand per operating profile · Tariff escalation 8%/yr · Degradation 0.5%/yr · O&M 1.5% of CAPEX/yr · Inverter replacement 10% (yr 12) · NPV at 12% over 25 years · Installed cost R13/W excluding VAT.

Results: recommended system (kWp), year-1 net savings, share of bill offset, payback, IRR on net 25-year cash flow, NPV at 12% and 25-year nominal net benefit. Battery storage and PPA savings are assessed in the feasibility study. Indicative only; a feasibility study uses 12 months of meter data, the tariff structure and a site survey.