Online Ups Loading/distortion Characteristics

[Vikramm]

Hi,

 

I am an Air Conditioning professional, not electrical, so please bear with me in case there are any mistakes in my questions.

 

I am looking for a good Double Conversion Online UPS for my office. 

 

Questions:

 

1. Is it true that a UPS performs the BEST only when it is more than 50% loaded? (Non Linear Load)

 

2. I saw a product demo in which a Double Conversion Online UPS was giving less than 7% voltage distortion on UPS output but 120% current distortion on the UPS OUTPUT SIDE.

 

Does current distortion on UPS OUTPUT side matter?

 

3. In my office, at night I sometimes work alone, so if I take a 3KVA UPS, it means that this 3KVA UPS will run just one PC. The cost of running does not matter. My question is --- will it HARM my PC, if a 3KVA UPS is giving it power, and no other load is there?

 

It would be difficult to purchase a 3KVA online for my office, and a separate Online for my PC.

 

 

 

 

Thank you.