The accessory power sockets can be used when the ignition switch is in 
ACCESSORY
 
 ■ Accessory power socket(s) (console
panel) 
 ■ Accessory power socket (cargo area) NOTICE Do not insert an automotive type cigarette lighter element. This can overheat the power socket. The accessory power socket is designed to supply power for 12 volt DC accessories that are rated 120 watts or less (10 amps). To prevent battery drain, only use the power socket with the engine run. When each socket is being used simultaneously, the combined power rating of the accessories should not exceed 120 watts (10 amps).  | 
Honda Odyssey Service Manual > Cooling: A/C Compressor Replacement
   NOTE: Do not install the A/C   compressor into a system unless you are completely sure that the system is free of contamination. Installing the A/C   compressor into a contaminated system can result in premature A/C   compressor failure. If the A/C   compresso ...