Dave Plowman (News) expressed precisely :
Lidl are selling those automatic chargers that revert to a maintenance
charge and can be left on indefinitely, for only 13 quid. It's small and
has fixing holes in the case. I was considering fitting one permanently to
the old Rover, and having a mains inlet point somewhere on the outside of
the car. The question is what would be a suitable weatherproof connector
for this as the car lives outside? About IEC size would be ideal.

The blue round plugs and sockets as normally fitted for caravan use
would be best. 13 amp plug, length of cable with a blue socket on the
end, then a matching blue plug on the charger.

I would also suggest the 13amp socket is one protected by an RCD. I
would also suggest that the charger is NOT installed under the bonnet
where spray from rain can get at it - perhaps in the cabin charging via
the lighter socket or similar?

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk