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REC and WS500 User Forum

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REC BMS How to configure your current sensor

The REC users manual includes some detail on how the whole ADC converter is able to extrapolate and read current flow from your battery system.  There is a calculation there explaining the math required to convert the digital steps to analog DC current, but it is kinda cryptic.

The BMS needs to know how many amps there are for every digital step of the Analog to Digital converter, and then we enter that value into the IOJA  variable.

The simplified math looks like this:

ADC resolution coefficient =  0.011751875

Voltage Drop of the current shunt over its range = V drop  (Usually 50mV or 75mV)

Current shunt range = Range (Usually 200, 500 or 1,000 amps)

IOJA = res coef x V drop /Range


For a 200A/50mV shunt the math would look like this

IOJA = 0.01171875 X (50/200) = 0.0029296875

For a 500A/50mV shunt

IOJA = 0.01171875 X (50/500) = 0.001171875

For a 500A/50mV shunt

IOJA = 0.01171875 X (50/1000) = 0.0005859375