Hi all,
Been fiddling with Arduino boards for a while on and off, and I'm wanting to develop a monitor for my Cranking and Auxiliary battery banks, and perhaps the solar panel, but primarily for the Auxiliary. I'll measure voltages on all three, and measure current flow on the negative of my Auxiliary Batteries.
That will all be nice and easy to monitor, but this week I've been looking in to whats involved in estimating a battery's State of Charge, and it seems to be a minefield of PHDs. I would love to be able to estimate the AUX battery's State of Charge, and based on current use, estimate how long it can be run before reaching a safe state, such as 50%. Coulomb Counting seems like a reasonable technique, except that as overlanders, we rarely know when our battery is fully charged. A heap of googling comes up with buzz words like "peukert's equation" and "kalman factors", but in a number of PHD papers that I've browsed over, there seems to be little in the way of an implementable equation. I don't need incredible accuracy, I'd just love to be able to keep an eye on the system, and have a better solution than Terminal Voltage, while under load. I've been out of Uni for 4 years and am a bit out of touch with some of the mathematics.
Has anyone tried tackling something like this and found a reasonably useable accuracy?
Been fiddling with Arduino boards for a while on and off, and I'm wanting to develop a monitor for my Cranking and Auxiliary battery banks, and perhaps the solar panel, but primarily for the Auxiliary. I'll measure voltages on all three, and measure current flow on the negative of my Auxiliary Batteries.
That will all be nice and easy to monitor, but this week I've been looking in to whats involved in estimating a battery's State of Charge, and it seems to be a minefield of PHDs. I would love to be able to estimate the AUX battery's State of Charge, and based on current use, estimate how long it can be run before reaching a safe state, such as 50%. Coulomb Counting seems like a reasonable technique, except that as overlanders, we rarely know when our battery is fully charged. A heap of googling comes up with buzz words like "peukert's equation" and "kalman factors", but in a number of PHD papers that I've browsed over, there seems to be little in the way of an implementable equation. I don't need incredible accuracy, I'd just love to be able to keep an eye on the system, and have a better solution than Terminal Voltage, while under load. I've been out of Uni for 4 years and am a bit out of touch with some of the mathematics.
Has anyone tried tackling something like this and found a reasonably useable accuracy?
