I'm trying to measure the watts used by a subpanel, but the loads are

**unbalanced.**

For example, for the 208v lines (black, red, blue) I get :

-- 42A

-- 84A

-- 80A

I know about P = √3 Vl × Il × cos φ where cos φ = power factor, but that's for balanced scenarios, right ?

I'm going to have to guess at the power factor - most of the loads are lighting & computers/monitors.

But anyone know how to calculate the total power draw ?

If you look on this page, Three Phase Current - Simple Calculation and look at the "Balanced Voltages" section it implies that for unbalanced systems you can still calc as such :

- the line to neutral (phase) voltage VLN = 208/√3 = 120 V

- phase 1 apparent power =
**42**x 120 = 5040 VA = 5.04 kVA

- phase 2 apparent power =
**84**x 120 = 10080 VA = 10.08 kVA

- phase 3 apparent power =
**80**x 120 = 9600 VA = 9.6 kVA

**Total**three phase power = 5.04 + 10.08 + 9.6 =**24.72 kVA**