Thats a good point. I hadn't done the math. A 72v battery charged to 100% is 84.0 volts. If the controller is pumping 45a that means 84*45=3780w.
Here's the thing though: You have a UPP battery. Now... UPP batteries are inexpensive and thats the only good thing you can say about them. They have a reputation for not being robust and tend to be touted for their cheap price and thats it. Long term, expect to have it underperform. Here's the thing: that casing is sized for their typical 48v/52v packs and I can say absolutely for sure that there is no way in hell that what I am seeing in that pic is a 72v pack that holds 19+ ah of capacity. There is simply not enough room for that in the case. You would not be the first person who got sold a bill of goods in this regard.
This is what UPP's 72v, 20ah pack looks like: A giant brick.
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Their 52v, 20ah battery looks exactly like yours:
Free tax , no custom value , and fast shipping with US Fedex ,3-5working days arrive 。 USA After-sales Service Center This Item ships from United States , Can ship to most US States , don't ship to Hawaii , Alaska .
www.uppbattery.com
I don't think there is any chance you have a 72v pack. Yours is either 48v or 52v. If you bought from a reseller, they hosed you. That 52v pack has a 30a BMS. Thats as much as it can take and frankly I would not want to press my luck by going max with a UPP battery given their history.