I need some really clear help please.
I have 3 AGM batteries each with a capacity of 95ah at C20.
I charge using solar and DC2DC.
As the volts of the battery can be iffy for measuring state of charge due to loads always changing on it. I usually use used amp hours as my guide of what I have left in the energy piggy bank.
Recently I have noticed when driving that the state of charge percentage and the used amp hours just jump to fully charged even with around -20 amp hours to go, then I go into absorption and it trickle charges for ages.
In the past I have noticed my voltage (I know not very accurate) can drop to 12.2 with only around 10 amp hours used. I guess this jump to fully charged has happened a few times and cumulatively has made my used amp hours untrustworthy as a guide.
Can anyone give me guidance on the settings I need to put in. I've worked out the peukert, watched all the videos and twiddled the tail current but it seems it is not working. I need an adult with some idea of what I'm doing wrong please.