Dave,
I run off a 85Ah 12v Leisure battery that's a 'normal' car size battery - not one of the huge truck size batteries.
I can get 2 days racing at a national with no problems and I've been using this battery for the best part of 4 seasons now.
I do pre-charge my batteries before I go to a meeting (means I can get up later and arrive ready to practice) and Dale's calculations would sound about right to me.
There have been other threads about the pros and cons of 'normal' car ranking batteries vs deep discharge leisure ones and both parties make compelling arguments for their cause.
I'm encamped on the deep discharge battery side of things - the heavier duty plate construction in the battery means that it is designed to withstand deep discharging whereas a normal car type battery is constantly being topped up via the alternator.
But whichever way, 85Ah - 100Ah is likely to see you through - but you could trial it out with the battery you've got already before taking the plunge - even if it's only for one day - better to be safe than sorry maybe??
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