Ecoflow Delta 2 Max Extra Battery has an expandable capacity up to 6kWh with 2 extra batteries. With multiple charging methods up to 1000w and 500w per port. The fast AC recharging can charge up to 80% in only 68 mins with an AC input of 1800W. Unlike gas generators, there's no fuel to refill, filters to clean, or moving parts to break. Without engine oil level checks, oil changes or spark arrestor inspections, spend more time on doing what you like. Without internal combustion engines, solar generators are extremely quiet. From a distance of approximately 20 inches, the noise level of a DELTA 2 Max solar generator (low input and output of around 500W) is only 30 dB, versus others with a volume of 45 dB or higher. In comparison, gas generators can run at an average of 70 dB even from a distance.