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Post by SDL on May 19, 2017 15:52:31 GMT -8
dfrench92 NOVEMBER 11, 2016 AT 09:41 #16127 I am trying to use the INA3221 break out board to monitor the power output of a solar system. The system outputs over the 2 amp max that the board can handle. I have read where a larger shunt can be placed in the system by cutting the trace for the on board 0.1 Ohm shunt, but i cannot seem to find where the cut needs to be made. I have purchased a 10A 75mV shunt that i plan to use. I need to know how to cut the trace of the on board shunt and any changes that need to be made to the code provided for the Raspberry Pi on your sight to make this work properly.
Many Thanks in advance!
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SwitchDoc Labs NOVEMBER 13, 2016 AT 14:28 #16181 From the IN3221 Specification:
SJ3, SJ4, SJ5 – 0.1 Ohm Shunt Resistor Bypass Jumpers SJ3, SJ4 and SJ5 are by default connected on the board, running the measured current through the default 0.1 Ohm Shunt resistors on the INA3221 Breakout Board. Cutting these jumpers allows the user to supply their own shunt resistors.
You place the shunt resistors across IN1- and IN1+, etc.
You will need to modify the driver to correctly scale it for the shunt resistors you use. However, if you don’t want to do that, then scale the results when you read them from the driver.
We have attached a picture showing where these jumpers are on the board.
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