12V power feed to the boot

I want to run a 12v pressure washer (for cleaning down my mountain bike after muddy rides!), so it would only be running for 15mins tops at a time. However, may also run an electric coolbox at times.
 
I have one, got it from VAGparts.com, didn't fit it myself though :)

Use it for charging the laptops and with an invertor, other re-chargeable things...
 

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