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The 13.8V is OK - that's about the same as a fully charged battery.
I use 240/12v 10A transformers in the observatory - I have one dedicated (at set to 15V) for the mount and the other for all the rest of the gear.
My USB powered hub needs 5.5V so I run it from a 12/6V stepdown convertor.
For the "portable" HEQ5 I use a couple of 20Ah gel cell batteries which are still going strong after eight years (try that with one of those car starter packages!)
Hope this helps.
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