INA219 Current Sensor - Solar Panel Charging

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marks3
 
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INA219 Current Sensor - Solar Panel Charging

Post by marks3 »

I have an application whereby I want to measure current and voltage on the output of a 140 watt solar panel. I also want to measure the current to/from the battery during charging/consumption and also measure the consumption of the devices (load) on the charge controller.

The panel output is rated at 7.87 Amps max and 17.8 volts max.

What resistor or (combination of resistors) should I select to replace the stock 0.10 2 Watt resistor on the INA219 and where could I source such a part?
I am thinking that I need 0.025 Ohms but what about Watts?

Thanks for your help.

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adafruit_support_rick
 
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Re: INA219 Current Sensor - Solar Panel Charging

Post by adafruit_support_rick »

0.025 Ohm sounds right. 2W is still plenty.
For sources, simply google "0.025 ohm 1% 2W current sense resistor"

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marks3
 
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Re: INA219 Current Sensor - Solar Panel Charging

Post by marks3 »

Thanks very much.

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mrumunhum
 
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Re: INA219 Current Sensor - Solar Panel Charging

Post by mrumunhum »

Do you have a schematic?

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Re: INA219 Current Sensor - Solar Panel Charging

Post by adafruit_support_rick »

A schematic of what? The INA219?
Here:
https://github.com/adafruit/Adafruit-IN ... Sensor-PCB

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mrumunhum
 
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Re: INA219 Current Sensor - Solar Panel Charging

Post by mrumunhum »

No, how did you wire the monitor circuit?

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