An off-grid solar power system can be used for many years? This issue should be separated, the solar panels have long life, can reach 20-25 years, controllers and inverters generally can reach 5-8 years, while the battery is generally 3-5 years. Batteries as energy storage device is off-grid solar power system is one of the most important part, but also the most vulnerable part of its life will determine the life of a solar power system. Users in the use of off-grid power supply systems, with special attention to safeguarding the components are battery and inverter, these two parts by the user habits. Therefore, special attention should be used. First, the battery in the course of maintenance batteries undergo repeated charging and discharging process, the so-called battery life, can be considered as usual is its ability to withstand the charging and discharging cycle back times. The first is through the number returned by the impact of the depth of discharge, the deeper the discharge, the fewer follow back, and secondly, if not promptly discharge the charge, will greatly reduce the number of cycles. Therefore, when in use, so as not too much depth of discharge, if the poor weather conditions resulting in insufficient charging, it should be less or stop using it. Especially in the expected prolonged rainy weather, we must ensure that there is a certain amount of power the battery. Second, the maintenance of inverters inverter rated output capacity has other, different capacity power generation system is configured inverter output capacity is not, as in the power supply to the appliance, make sure electrical power is lower than Inverter rated output capacity. In general, to ensure the inverter electrical power is less than 80% of the power level appropriate. For example a 300W off-grid power system is configured 1000W inverter output capacity, it can only give power 1000W below the electrical use, to ensure electrical power at 800W the following most reasonable. If the motors and other inductive loads, it should be 200W or less appropriate. It can be seen, off-grid solar power system life is affected by the user habits, should pay special attention during use.