[klondike98]

The 66B and the 37-610 are both 60 watt sets.  The 620 consumes 65 watts.   I would think an inverter that handled three hundred watts should do the job but I have no idea what the effect of that has on your battery drain since I don't have one of these but based on some info I found online ( https://www.donrowe.com/power-inverter-faq-a/258.htm ) you probably want to keep the motor running for at least some of that 2 hours.