Probably “don’t use an extension cable”… many are not designed for such sustained loads (though if you hunt around here you may find one or two recommendations- sorry, I can’t remember at the moment).Im intrigued by people suggesting to use granny charger at holiday accomodation. Is there anything to take into consideration?. I tried to use my granny charger at families house before, using a decent extension cable passed throught the window --- the extension cable started to produce a strong burning smell after about an hour. Any tips for charging from mains?
Also, check the wall socket to make sure it doesn’t get too warm when you’re charging.