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Quote: Originally posted by DaveCoaches on 26/9/2012

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Recording average amp hours in and out would be straightforward, the data is all there, it is just a matter of cross referencing it with the time base.

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I think there is some confusion here. Amp Hours is generally considered to be the capacity of the battery which doesn't change except as the battery breaks down. It is the number of amps that can be drawn from the battery for an hour before it is flat.

I think what you are actually asking for and I may be wrong is either something to indicate the "fullness" for want of a better word of the battery or is it an average charge or discharge rate since the system was last reset?

For example if the battery has had an average of 5 amps put into it for an hour, that would have had what you are referring to as 5 amp hours charge. If it had an hour of 10 amps and an hour of 5 amps, the result would be 7.5 amp hours charge?

Whatever is added, then it is important not to make the power consumption too high. I have got the system running on 3 mA at the moment which is pretty negligable. If we start getting into powering some kind of mobile internet access then this is going to increase, as is the cost of running it as there will be mobile dada costs plus the additional hardware. I like the idea of data logging, but I suspect that in the interests of power conservation it would be better to have the data downloadable by either USB or possibly by activating a blue tooth interface manually which would normally be powered down. Either of these is a relatively cheap and easy option, particularly the USB option.

I am not in the business of developing things like this at the moment so I am not touting for business at all, however if there is enough interest, I may have to reconsider that as I have also been working on several other non-caravan related projects with the hope that I may hit upon something that is commercially viable.

As I said in my original post, all suggestions or requests are welcome. One of the boards I bought in is the data aquisition device so if I add data logging I will have to develop my own alternative to that although that is not a big issue it will take time.