Given the latest set back at providing power to the ESCs, I'm beginning to reconsider the current power strategy.

I've been looking at my tether solution and doing the math on how that will effect my "power from the surface" approach. My tether is currently 200ft of 22AWG mil-spec wire. This has a total resistance of 6 ohms. I'd planned to use a large 4S LiPo as the power source, giving me 14.8V. This limits the current to 2.5A ... assuming I'm okay will all the power being dropped on the tether (err ... no). The power regulator on the ROV can handle 26V, so my first alternative would be to boost the tether voltage to 26V. This limits the current to 4.3A .... again with all the power dropping on the tether. Obviously this isn't going to work for the ESCs, so either I increase the gauge of the tether or increase the voltage further. Increasing the gauge will cause tether buoyancy issues (already a concern), while increasing the voltage introduces safety issues (this is in water after all).

So, time to investigate putting batteries in the ROV.