I realized about this outcome in a manufacturing facility in which we mainly applied pure sine wave variable frequency motor controllers on extended cables simply because excessive distortion on a long cable could burn up up a motor. All the opening house UPS I've viewed look like pure sine wave. https://connerbbxsm.buyoutblog.com/33775518/the-single-best-strategy-to-use-for-uninterruptible-power-supply-pronunciation