We use one when on 16A sites with no problem, if on a 6A site you are limited to the smaller hob as most you should draw is 1.3kw, there is a way to calculate what your limit amps x volts = watts so 16A x 220v = 3520w so just over 3.5kw.
If you tend to camp on 16A sites and unsure what you can use it's basically anything fitted with a plug as they will be 13A max however never use two at the same time unless you are 200% sure they are less than 3.5kw combined.
Many thanks for your reply. Think the site we are going to next is 10amp..wish i understood more about ehu. Do u think we could run both plates on that if no other elec was Plugged in? Thankyou xxx
10A = 2.2kw so personally I wouldn't risk having them both switched on at the same time however I would use them alternating ie brown beef on large hob - full power, add sauce let boil up then switch off (hob keeps heat for a while), on small hob boil water for pasta/rice whatever, once boiled switch off and switch large hob back on until bubbling and just switch between the two until meal is ready. This ensures no over useage of power and constant supervision of food so it doesn't stick to the pan which I will admit I tend to do at home with my electric hob .
Alternative is to get a couple of 1kw induction hobs - I swear by mine, its a lot quicker than a normal electric hob and its a lot smaller to pack. The one I have I from QVC and fits inside the pan of my frying pan when I travel. Cost me £34 + P&P. It cooks really well and I can boil 2 litres of water more quickly than my travel kettle could boil a cup full.
Great thanku so much for your help. We usually use gas but for safety and cost reasons think a hotplate is better. Will let you know how we get on though and thanks again for your comments xxx
Thanks again..were in a tent. Have had caravans before and do miss the built in oven but we love our space in the tent and no towing a bonus lol. Think were gonna go for the double plate xx