(Continued from Part 1.) DETERMINING HOW LONG A PPS CAN SUPPLY POWER To determine how long a fully-charged PPS will last, three things must be considered: 1.) The wattage of the device being powered 2.) How long you need it to run for, and 3.) The wattage capacity of the PPS battery. As previously mentioned, to simplify the math some of the battery rules are ignored such as maximum drawdown percentage of a battery and the energy loss when inverting from 12 Volts DC to 120 Volts AC. Appliance Wattage – Nearly every 120 VAC electric device has the wattage … The post Post-SHTF Lighting: Portable Power Stations – Part 2, by St. Funogas appeared first on SurvivalBlog.com.