Take it all with a grain of salt.
What I think you're referring to by OSE 8, is really a QS8 connector.
https://www.offshoreelectrics.com/pr...d=ose-qs8-anti
I use these connectors on every boat I've got, usually in a parallel battery configuration. I can tell you I pull well above 200A through 8ga or 10ga wire between the ESC and connectors, and 10ga wire creating the parallel connection. I pull 300A plus regularly, and have gone has high as 440A.
While it's quite true that a larger wire would decrease the resistance, a lot of my builds I run more than one wire into the QS8 connector, like a single 8ga from the ESC and a single 10ga to the parallel battery, into the same "bullet" on a QS8 connector. I could wire it differently I suppose, but with all my boats, pulling the amp draws above, I've yet to have a solder joint failure anywhere in any of my boats since I switched to QS8's.
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