Ham Radio Installed!

[HaulingAss]

That probably depends on what you feel is "considerable".

My best guess is that 13.8 V from the 48 V system, with the Tesla switching running, along with the necessary buck converter, best case efficiency is perhaps 90%. Via the 120 V system, maybe 80%.

That seems significant, but if you're drawing next to nothing, perhaps not a big deal in the scheme of things. If the HVAC system is on, or the main screen is active, it would be tough to see much of a difference I expect.

If OP is nervous about digging into the 48 V system, I don't think he's going to run out of power during his exercise because he used the 120 instead of 48 V system.

If it was me, I'd test each for RF noise and choose the quietest option.

I believe the 120V system has considerable phantom draw whenever it's activated, even when there is no load being applied, while the 48V system has much less. When there are active loads, the difference is probably less, but still considerable.

As for minimizing the RF noise, the evidence shows 48V is also the way to go. Regardless of AC or DC, you will still want a low noise power supply.

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