Power Consumption of MX-P50M Amplifier and FT-817ND

I setup a 12V, 30A power supply I have for another project to use with the MX-P50M Amplifier and the FT-817ND. I adjusted the power supply such that is has an output voltage of 13.8V. Here are the readings on 20m:

Current draw on Receive with amplifier on standby: 0.36A

Current draw on receive with amplifier on: 0.4A

Current draw with 1/2W in / 10W out : 3.69A

Current draw with 1W in / 20W out: 5.4A

Current draw with 2.5W in / 45W out: 7.2A

Current draw with 5.0W in / 60W out: 8.3A

Note that the power was measured with an SWR/wattmeter and at 5W input is clearly exceeding the 45W rating of the amplifier. So with this power supply I would limit to 20W with the magnetic loop antenna so just need to limit output power to 1W on the FT-817ND.

Next tested battery power. My portable power is provided by two 12V 7Ahr gel cell batteries connected in parallel. I hooked this up to my charge controller and measured the output voltage at 12.6V. Here are the consumption measurements:

Current draw on Receive with amplifier on standby: 0.36A

Current draw on receive with amplifier on: 0.39A

Current draw with 5W amplifier off: 1.77A

Current draw with 1W in / 20W out: 5.25

Current draw with 2.5W in / 24W out: 6.38A

Current draw with 5.0W in / 37W out: 7.0A

For 20W current draw remains the same as the power supply by my max power output is limited to 37W.

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