The way I read the chart you attached is that if a 110 amp load were put on a 1120 AH single cell battery with OCV of 2.10 the voltage would drop immediately to 2.05 volts. From there the voltage would continue to decline over an unspecified period of time until the battery is completely discharged at 1.7 volts. Can't see anything wrong with that. The one thing I do see is that the line is not linear. It's flat though out the first 50% or so but then takes a pretty good dip. This may present a problem when attempting to say that the bottom half is equal to the top.
Amp hours is one way to quantify the capacity of a battery and voltage definitely goes down as a battery discharges.
However reserve capacity is still yet another matter. They are two different measure of the same thing or should I say two different ways of arriving at the same place even though the route taken is different.
Reserve capacity is a timed value at a given load. The load is always the same no matter what size or type battery you are dealing with. The standard specifies that the load shall be either 25 or 75 amps. The value that represent the capacity of the battery is how long does it take for the battery to completely discharge at that load. That's it, no Amp hours, no C values and most importantly no Peukert. Rating a battery in AH is only relative to other batteries rated in AH. It easy to say an 150 AH battery has more capacity than a 100AH battery but if we should decide to test that capacity what load would you use. C-5, C-10, C-20 and these C values would be different for every battery. AH along with Mr Peukert law is very useful in determining how long a particular load can be sustained on a given battery but it would greatly complicate making a tester.
So you take a fully charged battery and put a 25 amp load on it. The battery voltage will drop but it doesn't matter. We are only concerned with how long does it take for this battery under this load to fully discharge. In the case of a 6 volt battery that would be 5.25 volts. When the trigger voltage is hit test is over. The second the load disconnects the voltage will rebound but it is of on concern. The test was over the second the battery hit 5.25 volts. The times will be different for different type and sizes of battery but the load will remain the same.
The tester you have designed and I am hoping to build is golden for this value of 5.25.
The question I am attempted to get an answer to is the 50% test valid. 6.1 volts is OCV that represents a 50% SOC. If the test cycle is stopped at this trigger voltage does that truly mean the battery under a 25 amp load has reached 50% or will that number have to be adjusted up some what. If it has to be adjusted would that same adjustment be good of batteries with differing capacities? I am hoping to get some input and answers tomorrow.
Amp hours is one way to quantify the capacity of a battery and voltage definitely goes down as a battery discharges.
However reserve capacity is still yet another matter. They are two different measure of the same thing or should I say two different ways of arriving at the same place even though the route taken is different.
Reserve capacity is a timed value at a given load. The load is always the same no matter what size or type battery you are dealing with. The standard specifies that the load shall be either 25 or 75 amps. The value that represent the capacity of the battery is how long does it take for the battery to completely discharge at that load. That's it, no Amp hours, no C values and most importantly no Peukert. Rating a battery in AH is only relative to other batteries rated in AH. It easy to say an 150 AH battery has more capacity than a 100AH battery but if we should decide to test that capacity what load would you use. C-5, C-10, C-20 and these C values would be different for every battery. AH along with Mr Peukert law is very useful in determining how long a particular load can be sustained on a given battery but it would greatly complicate making a tester.
So you take a fully charged battery and put a 25 amp load on it. The battery voltage will drop but it doesn't matter. We are only concerned with how long does it take for this battery under this load to fully discharge. In the case of a 6 volt battery that would be 5.25 volts. When the trigger voltage is hit test is over. The second the load disconnects the voltage will rebound but it is of on concern. The test was over the second the battery hit 5.25 volts. The times will be different for different type and sizes of battery but the load will remain the same.
The tester you have designed and I am hoping to build is golden for this value of 5.25.
The question I am attempted to get an answer to is the 50% test valid. 6.1 volts is OCV that represents a 50% SOC. If the test cycle is stopped at this trigger voltage does that truly mean the battery under a 25 amp load has reached 50% or will that number have to be adjusted up some what. If it has to be adjusted would that same adjustment be good of batteries with differing capacities? I am hoping to get some input and answers tomorrow.