Hello, everyone.

This is Enta.

You're using a generator, right? lol

Well, that's only natural, isn't it?

I brought the 60-kVA unit I had just bought last month to the ground anchor job site.

On a job site, electricity is everything, after all.

How do you go about selecting that generator?

 

I'm guessing—based on experience—that 45 kVA should be enough power here, right? Or maybe 60 kVA would be enough?

I think they're making their selections along those lines.

ThatDon't you think it would be better to switch to a more reliable selection process?

 

For example, let’s consider the generator used during sprayed mortar work.

Spray Machine Motor: 15,000 W (15 kW)

Conveyor belt: 1,500 W (1.5 kW) × 2 units = 3,000 W

Measuring Instruments: Margin of Error

Sand Hopper Vibrator: 50 W (0.05 kW)

Submersible Pump: 1,500 W (1.5 kW)

Total: 19,550 W (19.55 kW)

 

Divide this 19.55 kW by the power efficiency.

The power efficiency is 0.65.

Since modern generators are highly efficient, a value of 0.7, 0.75, or even 0.8 might be acceptable, but

Since you may be using a rental generator or your own equipment may be old, please divide by 0.65 (to be on the safe side).

 

19.55 kW ÷ 0.65 = 30.0 kVA

The required generator size is 30 kVA.

However, this value does not take into account the load placed on the motor when it starts moving.

This KVA value applies only when everything is operating stably.

 

The starting load of the motorInrush CurrentPlease keep this in mind and use a larger generator.

Actually, a typical spray applicator often uses a 45-kVA unit, right?

Since they don't all start up at the same time, the crossing gates won't come down, but,

Please be careful, as moving it all at once could cause the generator to make a "brrrrrr" sound and shut down.

Start the generator and use the distribution panel to supply power to each machine in sequence. Use the circuit breaker.

Doing it all at once would be crazy lol

Please use this calculation to determine whether the power capacity of the machinery being used for the construction project is sufficient.

There’s a clear difference between knowing this and not knowing it.

It can also provide a starting point for solving problems on-site.

 

See you later.

Electricity Cost Calculator + Power Conversion Tool

I found a website that was even more convenient than that.
It automatically calculates the KVA.