Hi @peterg -
The Blue Robotics voltage drop calculator should be able to help you here. If you put the length and size of wire, and how much power you intend to send, you’ll see how much will be lost as heat. If the cable is fully immersed, this heat can likely be dissipated without much issue - up until things start melting!
Generally looking at the watts of heat per meter of cable should give you a ballpark idea if the cable can handle your application.
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