www.cnsolarcharger.com PSONE is a multiple and portable AC-DC emergency power generator which s designed with the safe lithium-ion battery. It's a kind of back-up power station that's very easy to carry and convenient offering power to electrical appliances with advantages of light weight, large capacity , high power and multiple functions; This item is always used in the field of mobile office working, emergency communication, power lines repair, medical facility, exploration and survey, military, fire rescue and somewhere is lack of power energy; It's with capacity of 4KWh. Lynsa provides a solar energy solution.This is a solar off-grid power station. During the daytime charge from solar panel for energy storage. In the evening, satisfy the house electricity demand. Late at night charge from grid with low rate electricity for load shifting. Lower your electricity bill. UPS function ensures uninterrupted power supply once utility power outage. Please kindly watch the video as below.