6V vs. 12V Ah equal?
I am lucky in that my TC has a flexible space for batteries. Currently I have a group 27 interstate marine/Rv battery that I believe has around 100 amp hours (cant find a published number but remember...
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If the Interstate 12V batteries don't have a rate associated with their 115 Amp-hour rating, it may not be equivalent to a 20-hour rating. It could represent a lighter drawdown, like maybe 1 amp or 2 amp. If they don't say, we don't know.
But I suspect Interstate knows what the rating should be for a 20 hour drawdown, you don't bring a storage battery to market without fully exploring the charge and discharge behavior. It is just something they don't want to specify. Incomplete specifications like this are a way to pump up numbers for marketing. They may also argue that too much information confuses the consumer.
You do get more AH out of a battery drawing lighter current. This is mostly towards the end of the cycle, as voltage drops. You need more voltage difference at the plates to keep pushing the higher current against internal resistance, as well as against the load.
But I suspect Interstate knows what the rating should be for a 20 hour drawdown, you don't bring a storage battery to market without fully exploring the charge and discharge behavior. It is just something they don't want to specify. Incomplete specifications like this are a way to pump up numbers for marketing. They may also argue that too much information confuses the consumer.
You do get more AH out of a battery drawing lighter current. This is mostly towards the end of the cycle, as voltage drops. You need more voltage difference at the plates to keep pushing the higher current against internal resistance, as well as against the load.
