September 8, 2014

I need a 10kva 3phase UPS

Got a great inquiry today from a customer looking for an affordable 10kva 3phase UPS.

The short answer was ...
Sorry, there are none.

The more political answer should have been...
If affordable half the price of APC.com, then we have several options


The problem is that 3 phase anything gets expensive fast.  In electrical, 3 phase panels, services, transformers, and wiring is always about twice the cost of regular single phase power.

If we compare the APC Smart UPS 10kva single phase UPS with the APC Symmetra PX 10kva 3phase UPS you will see the differences.

Smart UPS 10kva
Symmetra PX 10kva
Kva
10
10
V. Outputs
120, 120/240, 120/208
120, 120/240, 120/208, 208 Wye
Unit Price /kva
$39
$85
Install Cost
+$550
+$2400
Outputs
Hardwire + Receptacles
Hardwire Only

As you can see the 3phase provides the same kva but at over twice the price and requires extensive input and output wiring costs.

So when does the 3phase system make sense?  For 2 reasons:

  • If your output requires 3phase power  or
  • If you are likely to grow over 16kva