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

Lars, 

Battery voltage is usually used alone to calculate SOC for lead acid, which explains why you don't have a hall effect sensor.  Yes, I would say the BDI number is probably the same as SOC for this purpose.  I'm surprised to hear that Thunderstruck hasn't been helpful.  I've always had good support from them personally.  

Darin

On Thu, Jun 20, 2024 at 10:43 PM SVTwister via groups.io <yellowchair=gmail.com@groups.io> wrote:

I don't have a shunt or hall-effect sensor to measure current at the battery cable. The display is connected to the Curtis controller which does not have any auxiliary sensors. The controller measures current, which is one of the data the display shows, so it could use that to calculate amp-hours, or it could use the voltage which is another thing the controller measures and displays.

I have four 100 Ah, 12 volt lead-acid batteries, by the way (in series for 48 volts). I stated this when I ordered the kit from Thunderstruck a couple of years ago, so I am wondering if the controller was programmed for my battery bank and how it calculates state of charge. Thunderstruck does not want to or cannot answer these questions.

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