wattless output

例句：

1. 1. The generator was wattless when it failed.
   发电机在失败时是无电的。
2. 2. The car's battery is wattless, so we need to charge it before we go.
   这辆车的电池是无电的，所以我们需要充电才能出发。
3. 3. The old house was wattless, so it needed a new electrical system.
   旧房子是无电的，所以它需要一个新的电气系统。