Being very new to caravaning (bought my very first used Elddis 12 days ago.)
My problem is the battery won't hold the charge, the van is on a site storage all year.but when in use I will allways have a electric hook up
Now my question is what AH battery do I need? bearing in mind having had a look around at sizes and prices What I want is the lowest AH I can get away with.
It all depends on what type of caravanning you want to do and how long you need the battery to last for before re-charging. Also you have to check the size of your battery box to see if it will accommodate a large 110ah battery as some older caravans will only accommodate an 85ah battery. People who are new to caravanning often think that the larger ah battery the more power it produces but this isn't the case, it's the capacity of charge that the battery will hold. In other words, a 110ah battery will last 110 hours till completely empty whereas an 85ah will only last 85 hours so in comparison it's much like comparing a one and half pint bottle to a one pint bottle as the larger of the two will hold more. So you have to determine what 12 volt power you are going to consume over how many days as you have your 12 volt water pump and if you intend using the shower as well during your stay then this is more demand of power from the pump. Some caravans have a 12 volt toilet flush and others are manual operated so if yours is powered by the battery then this is extra power required. Then there is the radio, CD player or even a TV which will consume quite a lot of power depending again on the amount of hours you are going to watch it. If you are on electric hook up during your stay then there's no problem having just an 85ah leisure battery as the onboard charger will keep the battery fully charged at all times so the power you consume is replaced by the caravan onboard charger. I was also confused about battery power when we first started caravanning but it helped me by reading different articles on the net and also in the Haynes 'Caravan Handbook' by John Wickersham. Hope this basic information helps.
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If the battery is not holding a charge sounds as if its knacked.Any leisure battery must be charged at least once a month to keep it it good condition.
During the winter or on long lay ups it advisable to bring the battery home and keep it charged up with a smart charger.Lidl/Aldi do them now and again for around £12 but others can be bought at around £34/35.
Jeff is quite right about keeping the battery charged with a smart charger and also what he says about the rocker switch set to 'van' but the switch may be in a different place depending on the year of caravan. The main 12 volt charger switch on mine is located under the worktop near the fuses and trip switches but on later models they can sometimes located on a panel above the door.
If you don't want to spend much money on a battery then get a second hand car battery from a scrappy. A car battery is not intended to be slowly discharged and slowly recharged as would happen when off EHU with a leisure battery, but if you are on EHU then the battery won't be discharging at all, the charger will be supplying the current, the battery will simply be smoothing any power surges and protecting the charger.
Incidentally, one of the clubs published an article not so long ago where they cut open a number of so called leisure batteries and found they were actually standard car batteries with a leisure battery sticker on them, so even a so called leisure battery may be a car battery, especially likely with the cheaper brands.
We didn't have a battery in our previous van, but all 12v things still worked when on ehu, pump, toilet flush etc, so depending on what you do it doesn't seen as if you always need a battery
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The only thing there is,if your charger/trasformer has a load rating of say 10amps and you switch things on like the lights etc with a power drain of say 15amps the charger/transformer will shut itself down to prevent damage to it.