High Current 100 Amps DC 12 V Sensor

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bjornsundberg
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High Current 100 Amps DC 12 V Sensor

#1 Post by bjornsundberg » 31 Mar 2021, 23:24

Hi,

Background:
I need to measure high DC 12V when charging/discharging current in my boat. Battery charger is rated 50 Amps and installation batteries are 2x200 Amps. I guess normal use onboard for TV, fridge, lights, navigation is some where between 1-10 amps.

Project:
My idea is to use a Hall-effect sensor connected to a INA219 connected to ESP8266 that measures the results from Hall-sensor.
The Hall-effect sensor I looking at is this:
https://flexscada.com/product/hall-effe ... -dc-100a/
The sensor measures up to 100 Amps DC and sends between 0V to 2,5V and 2,5V to 5V, where 2,5V is zero current.

Question:
What do you all think about using a INA219 to meaure the voltage from the sensor and feed it to Easy ESP and use a formula to calculate the current (positive when battery charger runs and negative when not and peripherals run).

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Björn

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Re: High Current 100 Amps DC 12 V Sensor

#2 Post by TD-er » 01 Apr 2021, 09:13

Good to have things isolated when working with high currents.
A Hall-effect sensor is reacting to magnetic fields, so I don't know what may happen if an electric motor, some solenoid (e.g. in a relay) or alternator is active.
The magnetic field of current through a single wire is probably small relative to the fields generated by an electric motor, or a solenoid.

One thing you may want to look into is whether or not the output voltage of this sensor is high or low impedance.
If it has a high impedance, you can easily get extra noise on the line between the sensor and your AD converter.

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Ath
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Re: High Current 100 Amps DC 12 V Sensor

#3 Post by Ath » 01 Apr 2021, 09:33

Instead of an INA219 current sensor, wouldn't a voltage sensor (AD converter) like ADS1015 or ADS1115 be much more convenient?
You might need a voltage divider to limit the range from 0-3.3V, but the result would IMHO be easier to obtain.
/Ton (PayPal.me)

bjornsundberg
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Re: High Current 100 Amps DC 12 V Sensor

#4 Post by bjornsundberg » 02 Apr 2021, 19:21

Ath wrote: 01 Apr 2021, 09:33 Instead of an INA219 current sensor, wouldn't a voltage sensor (AD converter) like ADS1015 or ADS1115 be much more convenient?
You might need a voltage divider to limit the range from 0-3.3V, but the result would IMHO be easier to obtain.
Great point, I'll test with that!

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