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I think 400w is ... well, a classic “your mileage may vary” situation. I’ve tried to use a bunch of stuff that weren’t low draw computers or tablets, well under the 400w limit and none worked. I know it’s got a solid 30a fuse, I tapped it for my subwoofer years back, but you’re not getting a full 400w capability.
I don’t think you’ll pop a fuse, you just likely won’t have enough juice.