My Yamaha 3000 sieb has a 13 liter tank (3.43 us gallons) and will run at the rated output for 8 hours. At 1/4 load that jumps to 18 hours.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.