6 calculators
Electrical & Lighting
Voltage drop, Ohm’s law, electricity cost, downlights.
Voltage Drop CalculatorDrop for a cable run, and the smallest size that passesOhm’s Law & Watts CalculatorVolts, amps, ohms and watts from any twoElectricity Cost CalculatorRunning cost of an appliance or toolDownlight CalculatorHow many lights for a room, and spacingInverter & Battery CalculatorInverter rating and battery modules for load sheddingPlug Points & Surfix Cable CalculatorSurfix cable sizes and rolls for plug and light points
Guides for this trade
Electrical & Lighting
Electrical CoCs and voltage drop
Why every electrical installation needs a Certificate of Compliance, what SANS 10142-1 says about voltage drop, cable sizes and plug circuits, and how to check a long cable run.
3 min readElectrical & LightingSolar, inverters and batteries for load shedding
How to size an inverter and a lithium battery bank for load shedding: list the load, check the surge, work out the energy and the usable battery capacity.
3 min read