The choice of battery , in addition to its size will depend on the type of caravanning you do. If you are nearly always on an EHU then it can be a cheap technology battery and does not need to be of very large capacity.
If you are an off EHU user things change greatly in that you need a battery of a much more expensive technology, of decent quality and as large as physically practical.
For the latter you need a true Leisure battery, not to be confused with a battery labelled as a "leisure" battery; largely price and definitely weight will give you a good bit of the info to separate between the two.
If you are in this camp:
Brands to trust are Banner, Exide and Varta; there is a lot of poor stuff out there. Read John Wickersham's dated but still on target "Power Plays".
Try a specialist battery vendor like Alpha Batteries and Tayna Batteries both excellent companies to deal with in my experience and both do batteries for a wide budget range.
See if membership of either main club yields a bit more discount; over time they do offers.
It will stop it discharging whilst not connected to anything. If its still connected to the van there maybe a small loss and 2.4w may not be enough when the light level falls.
Quote: Originally posted by kegonlegs on 20/7/2016
Hi peeps
Ive just purchased a Hankook 90ah DC27 battery and have a 2.4v solar panel connected to it is that sufficient to keep it trickle charged?
2.4 watts is around 0.2 amps. A battery could leak more than this with no load on.