1/12/2024 0 Comments Bogart trimetric![]() Some will getīetter capacity with the first charge cycles, level off for a while and thenĭecline with more aging and A-Hour ins and outs. Just be careful when charging back up to make sure each battery's voltageīut, battery capacity changes over the lifetime of a battery. So you don't want to measure capacity very often because of that. Made to be discharged all the way but you don't get nearly as many cycles You do have to get theīattery to almost 0% by measuring its resting voltage. I ~think~ that what might be missed there is mainly I^R losses.Īnd what discharge and charging C rate is that at ? That will make a difference.Īnd you can measure battery capacity. If it were 100% (no exceptions) then SOC would be easy stuff. Battery amp-hour efficiency may get close to that at I don't think I agree with almost anything electrical or electro-chemical beingġ00% efficient though. I think I may have seen that thread before, at least the first part. I forget the reference on that just now, one of the above refs i think. I wonder if thats where internal resistance calcualtions could come in? Internal resistance reportedly increases reasonably linearly with age, and is realtively easy to calculate based on voltage sag with known currents. Its how to account for the bubbling stage that i need to go back and reread NG's post. He also debates the topic at some length here:įrankly im still having a hard time understanding it, but the basic idea to not to try to compute SOC rather just the negative Ah from a known charged state. His theory is that Ah in/Ah out is 100% efficient, with the primary exception of absorb stage hydrolysis (self discharge being the other factor). I dont know if you know Northguy from NAWs forum, i asked how he does it, here: It ~should~ be fully charged when it goes to Float. You have to know the actual amp-hour capacity of the batteries, the amp-hour efficiency (around 95%) and when it is fully charged. In theory, it should be fairly simple to calculate SOC. Then, the efficiency might also be found at those measurement times and the meterĪll this sounds like too much fun, doesn't it ? Also, this should be done once every so often because What the batteries are actually good for. Getting within a few percent of real SOC is probably pretty good I would think.īut testing of the actual amp-hour capacity will have to be done at least once to get an idea of Kalman filtering for battery SOC estimation. There is some recent talk/research about using The best reference is probably the Trimetric. I'm pretty sure that this is why you sometimes see a jump from 99% or something like that to 100% with It's never that simple though, is it ? This is where constant calibration is needed at transition toįloat using the normal timing or End Amps means. Then you could just go to Float at that time. Proper "C" rating, it should be as simple as using that efficiency to tell how close you are to 100% full. Then, as it is charging, if the amp-hour efficiency is right on and the charging is done at the Then, as the amp-hours come out of the battery, it is simple to tell what it's SOC is based on that.Īssuming a Peukert correction isn't necessary due to ~heavy~ discharging during that time. Make the Absorb time longer than necessary to make SURE it is charged before going to Float and/or You have to know the actual amp-hour capacity of the batteries, the amp-hour efficiency (around 95%)Īnd when it is fully charged.
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