Long Lasting: Li-ion advanced battery technology delivers fade-free, clean power plus no engine means no emissions, no noise, and you can use it inside Wall and Solar Charging: Charge your power station via AC power, DC power, or eco-friendly solar (panels not included) with as little as a 4.6-hour charge time (AC + DC) Expandable: Chain up to 10 expansion batteries (sold separately) to extend your run time when powering your home, work or play Parallel Ready: A parallel kit (sold separately) enables this unit to connect with another Champion power station or a ParaLINK-capable traditional inverter to double your output power Champion Support: Includes a 3-year or 1000-cycle limited warranty with FREE lifetime technical support from dedicated experts