Connecting two or more leisure batteries is entirely possible, but it should be undertaken with caution. To connect the batteries, you'll have to have enough space in the caravan to house the multiple batteries safely, as well as ...
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Connecting 2 or More Leisure Batteries
It is entirely possible to connect more than two leisure or solar power batteries, but it must be done in parallel. This means that to retain the twelve volts that you require you must connect the two positive terminals together and the two negative terminals together. By connecting the batteries in this way as I have said you will retain the twelve volts that you will require power a twelve volt system, that is used on most cars and marine and leisure systems, it will also double the amps for more power storage, which is why this is done in the first place. This method also means that your batteries will charge at the same rate.
It is also important to use the same type of batteries, the accompanying video will explain about the different types of batteries and the best for most applications are AGM batteries.
The batteries that you connect together must also be the same type and age, preferably new batteries, it will be of no use if you connect a new battery with one that is old and has less power, this will only make the new battery fail at a later stage and not give you the full power that you are looking for.
It is also possible to connect each battery to a fuse, which will stop the risk of a high current flowing from the good battery to the battery with say a faulty cell causing it to short; this situation could be dangerous, with a risk of a fire or explosion.