According to Bambu Lab’s official specifications, the H2D is rated for a maximum power draw of 1320 W at 110 V, with an average power consumption of 1050 W. This maximum value refers to the intended upper limit of sustained power usage, not an absolute ceiling that the device can never momentarily exceed.
In engineering terms, published “max power” ratings typically represent the design envelope for continuous operation, not transient startup conditions. During warm-up, especially when the heatbed, hotend, and chamber all begin heating simultaneously, it’s entirely normal for the system to draw a higher peak for a short period — e.g., 1600–1650 W for 30–90 seconds. That does not contradict the spec; it reflects normal dynamic load behavior and is accounted for in PSU design.
So the specification is not inaccurate — it simply reflects the manufacturer’s guaranteed continuous operating limit, not a transient limit. Short-term peaks are expected in systems with resistive loads, and virtually all manufacturers handle this the same way.
However, on 120 V systems, such peaks can approach the practical limits of a standard 15 A circuit. While the breaker supports up to 1800 W, NEC guidelines recommend not exceeding 1440 W for continuous use. A brief spike to 1650 W leaves minimal margin and may trip the breaker, especially if other devices are on the same circuit. In those environments, power planning becomes more important — but this is a limitation of the electrical infrastructure, not a flaw in Bambu Lab’s specification.