Free tools
Generator calculators and tools
Four free tools for planning and troubleshooting a generator. Each one shows how it works and where its figures come from. They give estimates and guidance, not a final sizing or a diagnosis, so the result is a starting point for a conversation with a technician.
The tools
Generator size calculator
Add your appliances to estimate the running load, the largest starting surge and an indicative kVA size.
Fuel consumption calculator
Litres per hour, total litres and cost at your load, from manufacturer figures or a cited diesel chart.
Service due checker
Compare running hours and the last service date with the manufacturer’s interval: not yet due, approaching or overdue.
Symptom finder
Choose what the generator is doing to see possible causes, safe checks, stop-use warnings and the right service.