Answer
Can the Champion 2500W Ultralight Inverter (200951) run BLACK+DECKER BD12NWES 12,000 Btu/h window air conditioner?
Runs
Runs. Running draw 800 W fits within 1,850 running watts. Startup watts were not published; 2,500 starting watts is at least 3× the running draw, the common planning allowance for a compressor or pump start.
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The comparison
| Champion 2500W Ultralight Inverter (200951) | BLACK+DECKER BD12NWES 12,000 Btu/h window air conditioner | |
|---|---|---|
| Running watts | 1,850 W | 800 W |
| Starting / surge watts | 2,500 W | Not published |
| Type | inverter, Gasoline | Cooling |
| Published runtime | 11.5 hr at 1/4 load | |
| Sources | Generator source | Appliance source |
Questions
Can the Champion 2500W Ultralight Inverter (200951) run BLACK+DECKER BD12NWES 12,000 Btu/h window air conditioner?
Runs. Running draw 800 W fits within 1,850 running watts. Startup watts were not published; 2,500 starting watts is at least 3× the running draw, the common planning allowance for a compressor or pump start.
What watts were compared?
Generator: 1,850 running W and 2,500 starting W on gasoline. Appliance: 800 W running, startup not published.
How long will it run?
Fuel runtime depends on total load. Published runtime: 11.5 hr at 1/4 load.
Where did the numbers come from?
Champion operator's manual and sell sheet: 2500 starting / 1850 running, 79cc, 1.1 gal, 11.5 hr at 25% load, 39 lb. Outlet detail beyond 120V household outlets not verified. ENERGY STAR lists 12,000 Btu/h, CEER 15, 115 V, variable-speed compressor, and 600 kWh/year. Rated input is 12,000 ÷ 15 = 800 W, which matches 600 kWh at 750 hours. Startup watts are not published.
Safety first
- Run a generator outdoors only, at least 20 feet from the house, with the exhaust pointed away from doors, windows and vents. Never in a garage, basement, shed or crawlspace, even with the door open.
- Carbon monoxide is odorless and can kill in minutes. Keep battery CO alarms working inside the home.
- Never backfeed a house by plugging a generator into a wall outlet or dryer receptacle. It can energize utility lines and kill a lineworker or a neighbor.
- Connecting to home wiring requires a transfer switch or a listed breaker interlock with a power inlet box, installed by a licensed electrician and permitted where your jurisdiction requires it.
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