I am not so sure 16 awg feeding a device requiring a 20 amp service is acceptable.
I make dang sure my 12 and 15 amp power tools are fed with 12 AWG extension cords as short as possible, and I eliminate the extension cords whenever possible.
There are reports of PD converters not giving their full output on Generator power, perhaps they are also susceptible to not making their amperage rating when AC voltage is less than stellar.
My friend has a 100 amp Powermax converter, and it maxed out at 94 amps likely due to being fed with a undersized too long power cord.
Don't shoot for 'just enough' when maxing out a circuit, In my opinion. Voltage drop is not as much of a factor on 115Vac, but I don't let my higher $$ made in USA 12+ amp powertools to receive lesser voltages from poor power cables. Their exact replacements not only are not only too expensive, they are also now made in China.