Tacx Flow Smart: What is its electrical rating?

I am hoping to get a TACX Flow smart , which I will need to use with an inverter.
Could someone please tell me the Watts rating on the Tacx flow smart, and if available the average amount of electricity consumed. I need to make sure I use a powerful enough inverter, and be able to estimate the length of time it will run before I have to recharge the Battery.
TIA