Hi, Had AC180P for a few months now. And it failed to charge on mains. So tried it on solar and it charged OK.
So looking at the UK plug it had a blown 3amp fuse in and showed signs of over heating and melted fuse holder clips. With input showing mains charging at 1000w at 240v I feel the supplied fuse is under rated because 1000/240 is 4.2amps. Should it be a 5amp fuse in the plug?
At least. I’m in Australia, we also use 240VAC @ 50Hz and our wall outlets are all rated to 10 amps. Power cables for devices are all rated to 10 amps. Were it me, I would also check the plug rating, if it is moulded or printed on it.
I remember the big block plugs as a teenager, before emigrating here.
A fuse should be at least 1.5 times the load and preferably less than the cable rating. Therefore 1.5x4.2 =6.3 and the next size fuse would be 7.5A. This will take the 4.2A load and be less than the 10A of the cable.
<Use a 7.5A fuse. 
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As an aside, our plugs are not fused, they rely on the circuit breakers and RCD/RCDO’s of the house supply. Devices, if needed, are internally fused to protect the device. The fuses in your plugs are, I believe, to protect from possible cable damage short circuit.