Re: [electricboats] How does the Curtis F4A controller calculate battery state of charge (SOC) ?

Is there a shunt sensor on the negative terminal of the battery?   It would need that to be able to count amp-hours.

On 2024-06-20 12:04 pm, SVTwister wrote:

Hi Everyone,
I have a Thunderstruck 10 kW kit with a Curtis AC F4-A controller and a Curtis 3140 display. The display shows BDI (battery discharge indicator, which I guess is the same as State Of  Charge), battery voltage, current, rpm, motor temp, and controller temp--one at a time. There is a button to toggle between the different data. How does the controller calculate State Of Charge for the battery? Is it based on battery voltage or is it counting amp-hours?
Cheers,
Lars