Solar System Calculator

Step 1: Select the Type of Power Supply, namely Single-Phase or Three-Phase.
Residential homes in most cases use a single-phase power supply, while commercial and industrial facilities usually use a three-phase supply.

Step 2: Complete the form and click Calculate for the result.

Multilec Power Requirement Calculator

ZAR to USD (Exchange Rate)

Power Supply

Complete the form as accurately as possible

LED Bulbs 10 Watt

Light Bulbs 60 Watt

Fluorescent Lights

LED Flood Lights

Microwave Oven

Kettle / Urns

Oven and Hop

Geyser (150l) Equal

Oil Heater

Dishwasher

Washing Machine

Clothes Dryer

Refrigerator

Freezer

TV's HiFi / WI-Fi / DSTV

Computers / Laptop

Ceiling Fan

Aircon (10k btu) Equal

Pool pump

Garage Door

Convection Ovens

Cooker/Boilers

Deep Fryers

Flat Top Grillers

Ice Machines

Pressure Washers

Photocopiers

Security System

Angle Grinders

Sanders

Planers

Power Drills

Welders

Air Compressors

Bench Saws

Cold-Storage (in m3)

CALCULATION SUMMARY

Estimated power usage for appliance / equipment (in Watt/Hour):

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Motors: Direct Online Starting (DOL)

Motors: Star-Delta/AutoTransformer/Soft Start

Motors: Variable Speed Drive (VSD) starting

Estimated power usage for motorised equipment (in Watt/Hour):

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Power Requirement - Connected to the grid (in Watt/Hour):

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Power Requirement - Totally off the grid (in Watt/Hour):

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BASIC SOLAR PREFERENCE VARIABLES

Total Hours Per Day For System:

Solar Panel Efficiency Rate (Economy, Standard or Premium):

Average Size Solar Panel:

System Losses Factor (Fixed Range from 1 to 1.5):

Depth of Discharge (Optimal Range from 30 to 50):

CALCULATIONS FOR SOLAR SUPPLY - CONNECTED TO THE GRID

Total Watts of Solar Panels to get Total Solar Energy (in kWatt/Hr):

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Total Amount of Solar Panels Needed:

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Total Estimated Cost for Solar - Budget only (in ZAR):

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CALCULATIONS FOR SOLAR SUPPLY - TOTALLY OFF THE GRID

Total Watts of Solar Panels to get Total Solar Energy (in kWatt/Hr):

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Total Amount of Solar Panels Needed:

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Required Size of Inverter/s Needed (in kWatt):

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Size of Battery Bank Storage - 24Hrs (in Store Amperage):

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Estimated Solar Cost for Off-Grid (in ZAR):

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Special Notice: The calculation above serves as a guideline only, and may vary due to many other factors specific to your power configuration. Speak to Multilec for an accurate calculation and quote.