I have previously posted picks of a battery bank I have, It's 6 2 volt cells
I have no idea of their capacity.. and there is not one sticker or marking anywhere on them.
I have built an amp/hour totalizer that keeps track of the amp-seconds going into the battery and converts and displays it in amp/hours.
What I'm trying to figure out is lets say I charge the mystery battery until it reaches
14.5V for a full hour or so. Whatever my amp/hour meter says went into the battery should roughly be its amp/hr capacity minus a guess on what percentage of the power going in went to losses.
so just pulling figures from a hat lets say:
200 amp hours went in to fully charge the battery to 14.5V including bulk phase/absorption phase.
now say 8% of the energy was wasted in the battery due to losses.
- x .08 = 16 amp hours lost from the total leaving a battery capacity of
- amp hours.
am i on the right track or heading for a crash? I would like to be able to program my controller to be able to adapt to battery age ect and be able to tell the actual measured amp hour capacity of the attached bank. If I can nail that down then I can apply Peukerts equation to the load current to determine approx run times at various current draws.
Thanks for any advice.
Jamie