Often the wire size is dependent not only on the rating of the device, but also the distance between the device and the batteries as voltage drop is the limiting factor. Devices such as inverters also have to deal with ripple current due to the cyclic nature of the ac loads being supported by the inverter. Both of these may require that a larger cable size or fuse rating is required compared to that expected based solely on the simple current rating of the device (Amps = Watts/Volts) and the published maximum current carrying capacity of the wire. Voltage drop calculators can be found on the web or the Victron Toolkit app can be used, download from the Victron site or app stores. Victron software download page
Victron have written product manuals which contain clear recommendations on the wire size, fuse capacity and bolt torque and these manuals should be consulted. Victron product manuals can be found at https://www.victronenergy.com/support-and-downloads/manuals
Further help can also be found in the Victron guide, “Wiring Unlimited”, which can be found at https://www.victronenergy.com/blog/2019/09/03/wiring-unlimited/
If an answer is not available in the product manuals, then raise the issue here as that will alert Victron about the omission and the community can provide guidance in the interim. If you have an unusual installation case, then by all means seek help from the community.
