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We go non-EHU very frequently.

No, fridge will not run from caravan battery when sited. Use gas when non-EHU.

Impossible to be precise as to how many nights a fully charged battery would last, too many variables. We get 3-6 nights dependant how early it gets dark & how much time we spend  actually in our 'van.

However, some suggestions:

Go for the largest capacity your battery box will accommodate. Certainly disregard 60Ah as inadequate. 90Ah is 'normal', but 110 will give you more.

Be VERY economical with what you have switched on.  Acquaint yourself with the 12v electrical systems you have.  (Our Carver Ultrastore water heater uses current even when on standby.) If you have a 12v isolator, and fridge does not need electricity, switch it off every time you go out.

Change light bulbs for LED types. See Ultra LEDs: http://www.ultraleds.co.uk/caravanmotorhome-leds-c-100.html?osCsid=rhl65l64fppvrtr8ee04umgr77

Elecsol batteries are considered very good, but any one with a 3 year guarantee should be OK.

Consider  investing in Gaslow refillable bottles. I refill mine with LPG at the garage at 'pump' prices. Although a lot of garages don't like you doing this.

Hope this helps

Greetings lindjemp,

If only to get the 'Grumpy Face ' off the Index I'll try and answer this one.

The basic difference between the batteries you mention is 25.

O.K. so you knew that but here's the 'Techie' bit. The 25 refers to 25 Amp Hours of charge held within the 90 battery that isn't there in the 65 battery which holds, you guessed it, 65 Amp hours battery.

What is an Amp. I won't go into the jargon but everything that runs off your battery uses those amps.

The definition of how much is used is worked out by dividing the volts each piece of equipment is rated at by the watts that same piece uses.

Take the light bulbs in the 'van and assume each one is a 10watt halogen bulb. It is a 12 volt system so every bulb when it switched on is taking 10/12th of an amp from the battery for each hour it's working. Use 2 bulbs and you are using 20/12th ie 1.66amps per hour. Use 4 bulbs for an hour and you've used 3.33 and so on.

That is why so many people who go caravanning on CL's and CS's have converted their bulbs from the above mentioned Halogen bulbs to LED bulbs.These use far less watts and therefore Amps to give the same amount of light. 

So the answer to your question is the same as "How long is a piece of string" There is no cut and dried answer.

From the above you will have worked out that the 90 Battery will last longer than the 65. Providing that you don't use equipment that uses a lot of watts in it's operation, (and here I'm talking about most things that have a motor ie Hair dryers , Hair straighteners and Kettles.) (the last two I know don't have motors but do have 'Elements') The bigger the wattage, the faster that battery will flatten

I note that you are talking about 4 lights. Change them for the equivelent LED lights and you should last at least four days.

As a back up, you could also get an extention to your gey socket to plug into the cars electrics but only do that if you know that it is for a short period of time and you know that you will be using the car so that the alternater can give it back your charge.

Lastly, welcome to the world of self sufficiency. After a time and with the experience you may find (by trial and error admittedly) that you don't really need that 25metre umbilical cord that is Mains electricity.