开关电源把直流电源或交流电源通过它可以获得一个稳定的直流电压源。
Switching power supply or DC power to AC power through it will be a stable DC voltage source.
首次使用「模组7500」前，请先用电源线将机组接上110或220伏交流电（110/220VAC）或12伏直流电（12VDC）的电源插座，再将电池组充电约四小时。
Before using the Model 7500 for the first time, charge the battery pack for about four hours by plugging the unit into a 110/220VAC or 12VDC outlet using the power cord.
由于UPS(或逆变器)的输出是正弦交流电，它的并联运行比直流电源复杂的多。
Because of the output of the UPS (or Inverter) is AC, its parallel operation is more difficult than DC supplies.
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