Caravan Current Calculator | Appliance Health Check

This caravan current calculator helps you estimate the electrical current draw of a 12V appliance in your caravan based on its measured voltage and resistance. By comparing the calculated current to the size of the appliance’s fuse, the tool offers insight into whether the appliance is operating normally, drawing too much current, or potentially faulty.

Battery Voltage (V)

Fuse rating of circuit (A)

Measure component resistance (R)

Results:

Disclaimer: Electrical Safety Notice

This tool is intended for informational and educational purposes only. It provides approximate calculations based on user-supplied voltage, resistance, and fuse ratings to help interpret possible appliance behavior using Ohm’s Law.

The results do not constitute professional electrical advice and should not be used as a substitute for inspections by qualified electricians or technicians.

⚠️ Always follow manufacturer specifications and safety standards when working with electrical systems.
⚠️ Never install a fuse with a higher rating than specified for a circuit or appliance — doing so may result in fire, equipment damage, or personal injury.

By using this tool, you acknowledge that any decisions or actions taken based on its output are at your own risk, and the website owner accepts no liability for damage, loss, or injury resulting from misuse or misinterpretation of the results.

For any concerns about your caravan's electrical system, please consult a qualified professional.