Calculate the correct fuse rating for a DC circuit based on cable thickness and current draw.
General: standard circuits (USB, fridge, lighting). Lighting: dedicated lighting circuits. Motor: circuits with inrush current (water pump, roof fan, compressor) — a slow-blow fuse is recommended.
For runs longer than 3m, the safe current capacity is reduced.
Select a cable size and enter the current draw to calculate the fuse rating.
This calculation is indicative. Always consult an electrician for your installation.