TriMetric TM-2020: "Amp hours from full" display

Re: TriMetric TM-2020: "Amp hours from full" display

i hope i'm understanding you right on this and i will say in general about the trimetric. the trimetric tries to not only measure the amps lost from using your batteries, but also measures the same amps going back into the batteries. the problem is that it takes more current going back into the batteries to get it to be fully charged again due to efficiency factors. the trimetric does have provision for this efficiency that you determine for your batteries. if you don't set the efficiency factors into the trimetric or have misguessed the actual extra current that the batteies need, it will show a + or a - from full. this can be a guessing game as you rarely get it exactly right. even the battery temperature can swing the required current the batteries need to be fully charged. as i said it is a bit of a guessing game, but once you've found a good point to set it to, it does give an approximate charge condition. time and temperature can change that as well as a battery's ability to take or give current(aging for example).
i do have the meter and since getting a controller with an ammeter for measuring the charging current and i know the general soc by the battery's resting voltage, i do not wish to use my trimetric any longer. the state of charge of any battery can be determined by its resting voltage better in my opinion than guessing at various charge efficiencies. this voltage can vary by battery type or manufacturer. if you are in the neighborhood then go with the meter as a general indicator of your charge and please don't take it literally as being exact. if it appears to get a wild swing that goes beyond that which you would normally see then investigate it. minor adjustments to the meter or resetting can be needed at times because of additive inaccuracies over time. i hope this covers all of the bases to your inquiry to the meter.