This solar generator: 1) Green clear energy 2) Safe continuous and reliable 3 ... ) Long life: 20years First, the main features of1. green. Sun Guard is the patented product, the world's ... is long. Solar panel design life of 20 years, one-time purchase of equipment, do not need to buy ... and other energy, can be no long-term cost of electricity.6. product specifications, standard size according to user ...