# How can I choose the right stabilizer for a 3-phase 415 V supply system?

I have a question about how to select the right capacity of voltage stabilizer for a 3-phase supply system.

That system has the following type of load and capacity:

1. Two 1 hp 3-phase motor, 440 VAC (M1 and M2), 1.7 A.
2. 4 kW resistive heater (2 heaters on one phase (H1 & H2), other 2 heater are on (H3 & H4) other 2 phases).

As per my calculations, 7 kVA is sufficient with an 0.8 power factor. Could someone verify this? Please consider the inrush current of the motors too.

• A diagram would be appropriate Feb 16 at 18:48
• @VoltageSpike added sir. Pls check. Feb 20 at 10:01
• Diagram legend reads 415 V Motor, prose states 440 V - just saying. Line voltage for 230 V star voltage is 400 V, anyway. Feb 20 at 12:13
• There's pretty little to base consideration of "inrush" current on - that's load dependant. As per my calculations, 7 kVA… Please put those in the question body, too. (Even without spin-up/inrush, there's a significantly higher value on the back of my envelope, assuming rated kVA relates directly to rated current per phase.) Feb 20 at 12:32
• @greybeard how to calculate it with inrush? Feb 20 at 14:45