No I mean 200 for light, 400 nominal, 800 for max. You can see that 300W motor can offer you 700W of power momentarily, but it would heat up soon. As well you can see that if you overestimated your needed motor load, it could draw much less than nominal. If you put a 400W psu, you can draw that nominal power, but you loose that "turbo boost" that might be needed to pass an obstacle or something like that.
Notice, that I was using a datasheet of some 300w bld motor, you have to match the numbers with yours.
If your estimate for 300w motor was just a wild guess, you can only guess what PSU you need.
thank you very much. I am still confused but i am appreciated for your help
If you are confused, make some questions. I try to help.
" If you put a 400W psu, you can draw that nominal power, but you loose that "turbo boost" that might be needed to pass an obstacle or something like that."
what is the turbo boost? i have searched gg but can't find it.
300W is the exact number of the motor. As you said so I use a Power with 1000W is OK
Is that the nominal or the peak power?
I used world "turbo boost", meaning momentarily power reserve.
You need to understand that 300w is just a number manufacturer gives you. That's the max power you can safely run that motor continuously.
Motor itself doesn't know anything about that number, it would draw whatever amps it needs to keep on turning. So if you don't have nothing attached to it, it would draw maybe 2A, if you put a load to it it draws more, if you increase that load it would draw even more until it's stalling or burning, maybe 20A.
So now let's put that driver in this game. You set the current limits on your driver, so the motor can't ger more amps than you set.
Let's say you set 8A limit to keep it close to it's nominal current. So now the motor can run a load that's max 8A, not more, but less yes. But if your PSU can't offer that 8A of power it would shut off.
I tried to simplify a lot, it's more complicated, but fine to start with.
You have two options to go forward, you can study or you can guess.
If you buy that 1000W PSU and set your drivers correctly, you have realistic changes to supply both motors+electronics, but you would not get max out of them contemporarily. In case you need little extra you can add another PSU for second motor.
But if your load is bigger than what your motor can handle, you need to upgrade the motor. I wish not...
I understand all that you said except "but you would not get max out of them contemporarily." I have 2 drivers for 2 motor
Means you coul'd not get momentarily 15amps/motor from that setup. But nobody says you ever need that.
Maybe your robot is light and well made and you never need more than 400W to run your motors.
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oh well. It helps me a lot.Again, thank you very much 
The max current for the driver is 20.6A.
For two that's 41.2A
So if you buy a 48V, 40-50A supply, you are good to go.
I think 20.6 is the current the driver can stand max. When the motor runs, it will not be that 20.6A
It could be if you have high load and you don't limit your current. But you can set limit from few amps up to that 20.6A
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True but you apparently don't know the maximum motor current, so how will you choose the correct power supply?
yeah, but I think my project won't get 20.6A for each motor. Besides, the cost of the power supply 50A is high for me 
Why do you think that?
Should be written: "but I hope my project won't get 20.6A....." 
yeah u get me 
I will get the motor with the wheel. I will test it soon and hope