Peak Power - how to calculate

[brushless]

I am confused how to calculate by bike components, peak power.

The battery is 48v 15a. That is not what I am looking for (48x15 =720 )
That is not the peak power . My bike is advertising 1800 w peak power.
The Controller
Bru shiess DC Motor Controller ( I am typing it out as it is written , what a joke huh?)
Voltage :48v | Low Voltage protection: 40 +- 0.5V
Maximum current :25+-1A |

I thought 48v times the max current of 25 = 1200 would be peak watts no?

[Criminal]

@brushless it may be a reference to the start up amperage which will be much higher than the morors rated Amps so that might be how that value was derived. Or it could be related to the mechanical power of the bike not electrical. Not sure how that would play out in calculating the "peak power", but I think you need to know rpms and torque values.

I would contact the seller/dealer (doubt they'd know), or better yet the manufacturer and request their means of calculating their own advertised power value.