One of the least expensive and most capable plug and play type battery
monitors is the Cycle Analyst:
https://ebikes.ca/shop/electric-bicycle-parts/cycle-analysts.html
https://ebikes.ca/product-info/grin-products/cycle-analyst-3.html
It does all sorts of things like a speedometer, pedal torque sensor,
optional GPS, etc. As I recall, the Cycle Analyst uses the battery
voltage (11 to 150 volts) for power and can run on some external source,
if desired. It can optionally be run on up to 500 volts. Its current
draw is ~10 mA, plus whatever accessories you might add on like a torque
sensor. It draws a constant power, as I recall.
The "E-Meter" (LinkPro and LinkLite) is also an excellent battery
monitor as well. It is the industry standard for State Of Charge (SOC)
monitoring. It can run on the battery itself if it is between 9 and 35
volts. Otherwise you need an additional DC to DC converter. The draw is
at 7-9 mA. The greater the battery voltage, the lower the mA draw. (It
draws a constant power.)
https://xantrex.com/products/accessories/linkpro/
Bill D.
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