Hallo Alvin :-)

 

APC has done an excellent thing as a manufacturer to have put up the Time versus Load graph and I believe it is pretty accurate. I'm not sure how you can get 3 hours on the 1.5kva ups unless the load is less than 50watts which for a server is impossible. Even a laptop takes up about 75-100Watts. Unless your client has added additional battery banks, than it is fine. But the bigger problem then is the drain/charge cycle. Drain @standard 400w load = 30 minutes while Battery recharge = 3 hours. This would mean major investments in not only battery banks but external supply and charging too. The cost has just shot up very steeply.

 

Me thots and rush rush...