The FSP Champ 1K is an excellent but noisy online double conversion inverter
The FSP Champ 1K is an excellent pure sinewave double conversion online UPS and it is well suited for a professional environment. But as it is an online UPS it needs constant ventilation and in a particular environment the fan noise is unbearable. So I had to change the Inverter fan for a noctua and it's much better. The temperature is still average and the inverter has been working perfectly 24 hours a day for several weeks. In short, with a few modifications this inverter is really superb