The Zero Breeze Mark 2 is a battery-powered portable air conditioner built around a real compressor — not a swamp cooler or thermoelectric fan. It puts out 2,300 BTU on 240W of draw, which is roughly one-tenth the power of a typical 10,000 BTU window unit. The unit weighs 16.5 lb and measures 20 × 10 × 11 inches — small enough to fit in a rooftop tent, van sleeping area, or small trailer bunk. Dual-hose design runs a separate duct for intake and exhaust, which matters in enclosed spaces: single-hose units depressurize the space and pull hot outside air in around seals; the Mark 2 doesn't have that problem.
Power options are flexible. The Mark 2 Battery (24V 35Ah, 840Wh) clips directly to the unit and runs it for roughly 3–5 hours depending on mode and conditions. The battery can also charge via solar, vehicle outlet, or AC adapter — input range is 18–36V DC, recommended 21–27V. If you're running a larger power station, the 12V to 24V Converter (sold separately) lets you draw from the station's DC output directly rather than through its inverter. The Mark 2 also doubles as a small power hub when the battery is attached: USB-C PD (45W), USB-A, and 12V DC output for camp accessories.
Realistic expectations: 2,300 BTU will make a well-insulated, well-sealed small space meaningfully cooler. It will struggle in a large, poorly insulated space, a tent with leaky seams, or direct midday desert sun on thin fabric. The unit works; the space needs to cooperate. Noise is rated 52 dB(A) — audible but not intrusive in an outdoor sleeping context.
