I was thinking of using the 5.5 mm output on the AC 200 Max. I assume that’s 5amps per output? I can’t seem to find a plug that is rated for 5amps which makes me wonder what the output is for? Has anyone been using this?
If you are referring to the 12V - 10A D5521 DC ports, on the front panel, between the 30A RV outlet and the USB-C port, they are barrel connectors and there are 2 of them. They are normally positive on the inner and negative on the outer, often used for things like LED lighting and other low load devices.
According to the user manual, they appear to share the same circuit as the 12V - 10A cig socket for a total of 12V -10A for all 3 combined.
i.e. If you plug into one D5521 port with a 2A load, there will be 8A left to share between the other D5521 port and the cig socket. 
You need to know what your loads are or will be…
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Do you think plugging a fridge that draws about 3-5 amps would be ok? I tested it out and the connector doesn’t seem to over heat.
Yes this will work, don’t forget to put a fuse on the positive wire (try a 7.5A, if it blows use a 10A)
Also, you will then only have a further 5-7A left for the other barrel connector and cig socket.
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