not as such, but all items you wish to use will have a label on them giving the wattage, which you just add up together, and depending on your supply to the caravan depends on how much you have available, a water heater is approx. 750 watts, and about the same for your fridge, so that means under 1500 wats is being used constantly, (most only turn the water heater on a couple of times a day to heat up the water before its acutally needed) so if your heating was on, and you wanted a cuppa, you would have to turn the heating off for the 2 mins it takes to boil it
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Basic sum is to divide by the watts by the voltage to give you amps, and amps is what you’re interested in ensuring you keep it below what is provided. A lot of sites in UK are either 10 or 16 amps, abroad it can be as low as 6 amps. Buy low wattage items for your trips, taking the 2000watt kettle from home just won’t work 😉
there is no need in the uk to be buying low watt stuff, just about all sites have min of 10 amps which is 2400 watts, unless of course you want to wait about 10 mins for a low watt kettle to boil
Couple of things to be aware of, microwaves are on the face of it rated by their cooking power NOT their power consumption which can be 1.5X more (800W rated = 1200W consumption!). Many devices draw a quite large 'surge current' when they start before settling back to their rated load, if you are near to supply capacity, switching on a device can momentarily overload the supply, it shouldn't really trip on a momentary overload but it may! Safest not to push your luck if too close to the limit.
As said before, what you need to know is the current drawn by each device (xxxx [Watts]/240 [Volts] = Amps), then just total up all devices switched on at same time, not forgetting that the standard inbuilt battery charger will be drawing possibly 3 Amps as well!