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DragonFire is a 50KW system, the US is supposed to have systems that are 6 and 10 times more powerful available in 2024 with a system that's 20 times more powerful in 2026. The US already has a mobile system, deployed on Army Strykers called DE M-SHORAD, as powerful as the British DragonFire.
A 10KW will down a decent sized drone in 8-15 seconds depending on where it hits. A 50KW will obviously do it faster and the 300KW and up systems will likely make it near instant.
Hmm interesting. Imagine a new arms race between lasers and drones. Country A can make this crazy laser defense system. Country B can make 50x as many drones as country A can handle.
Is it 50kw power draw, or thermal power delivered to the target? Even if it's power delivered to target, that's a 10 deg/sec rise in temp for a 1kg mass with the thermal capacity of water, it's not insane. (If I'm doing my math right)
I believe they are rated by power output at the emitter. I think your math is correct but these systems aren't heating water, nor are they heating a kilogram of it. They're simply trying burn through / melt a few ounces of plastic. The journalist who test fired a 10KW system was able to down a drone in about 15 seconds by slagging its propeller so I have to imagine that a 50KW system would do it even faster, potentially as quick as just a second or two.
That's why I was saying larger missiles would be more resistant, since they'd have higher thermal conductivity aluminum, and a shorter closing time than 15sec.