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

I have a thunderstruck kit also but using the dilithium display.  I have a current sensor on the main battery cable that the display uses to "count coulombs" and estimate SOC.  If you have lithium batteries it's probably a similar setup for you as you can't really measure SOC very well from voltage because of the flat lithium discharge curve.  You should see a toroidal device around one of your cables very close to the battery.

On Thu, Jun 20, 2024, 10:08 AM Dan Pfeiffer via groups.io <dan=pfeiffer.net@groups.io> wrote:

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

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