Canadian Energy™ - CCA, Amp Hour & Reserve Capacity

Описание: Reserve Capacity (RC) is a general indicator of how long a new, fully charged battery can continue to operate essential accessories if the vehicle’s alternator fails. It identifies how many minutes the battery can deliver a constant current of 25 amps at 80°F without falling below the minimum voltage, 1.75 volts per cell, needed to keep your vehicle running.

RC and Ah are NOT one in the same as I often see people use them interchangeably. Usually, most batteries that do not have an amp hour rating are also not usually a purpose designed deep cycle battery. Some still are, but have just not been Ah tested.

A safe bet is to always by a battery with a Ah capacity rating. This ensures that the battery has been tested and rated for such. You still can use the RC/Reserve Capacity number but this number should generally be divided by two to arrive at a close Ah capacity.

RC is generally almost DOUBLE what the usual Ah rating is. On another forum, a rather astute and knowledgeable owner stated that their battery had XXX Ah's. The reality is that this battery was never rated in Ah capacity and only in RC so this bank was nearly HALF the size it was thought to be, which could prove to be an expensive miscalculation.

Mistaking RC for Ah can be a dangerous and costly mistake. You could kill your batts. This is especially true if after removing 150 AH from a 300 RC bank, thinking you are only at half discharge, when you are actually closer to flat dead.

There are a few theories on how to determine Ah capacity from RC but none that I have found spot on. Some say to divide RC by 2 then to add 16 to that number while others just say to divide by 2.

If you buy a specific group size battery eg: group 24, 27, 29/31, 4D, 8D etc. and the one you're buying has a significantly higher "rating" than others of the same physical size that should be a red flag that you are looking at an RC measurement rather than an Ah capacity measurement..

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