I have an SLA battery, at say 10 Amp-Hours, connected to 3 high power motors. Each motor can draw up to 10 Amps each (worst case / max power). Using Q = It as an approximation, I see that I get 1200 seconds of usage. (Q = 3600*10, I = 30, t in seconds)
For my application, what circuit can I built/add on to measure (estimate) the charge remaining? Right now it’s literally just SLA battery –> motor controllers –> motors, with an Arduino connecting to the motor controllers.
I was wondering if something like this: https://www.sparkfun.com/products/11005 could connect to the battery leads, the other end to Arduino, and then I sample the current every few milliseconds and “subtract” the charges from my total of 10 Ah. E.g. charge_used = sample_period * current_measured; followed by charge_remaining -= charge_used;.
Are there better ways of measuring the remaining battery capacity? Is my approach even feasible?
Cheers