what to use ACS712 or ACS758 for current mesurement

Other Hardware Sensors
1

Hello,
I'm staring a new project, the mesurment of the power from 3 spply the PV, batteries and the grid, i planned to use a current sencor for AC and DC, I' don't know witch one of the sensors I should use, the ACS712 or ACS758.
If someone explant to me how to choose between them.

2

What is the maximum current in Amperes that you expect to be measuring?

3

It's a mesurement for home 30A

4

The ACS758 data sheet claims that the sensor is factory calibrated, and its output sensitivity is fixed for the fixed amount of current passing through the hot circuit. For ACS712, the output sensitivity varies sensor to sensor as per its data sheet which says that the sensitivity is 66mV - 185mV/1A current in the hot circuit. For sure, use of ACS758 is the right choice! The Selection Guide is taken from data sheet and is pasted below for quick reference.

5

Either will work fine.

If you choose the ACS712, make sure you get the 30 Amp version (they are rated to survive 5X overcurrent). If ACS758, get the 50 Amp bidirectional version.

6

If using ACS712, do we need to calibrate it against known two points to account for the gain and offset? The question arises owing to typical value of the sensitivity of the ACS712 which is, according to data sheet, 100mV/A ((66+185)/2 = 125).

7

All sensors can benefit from calibration.

The ACS712 can be purchased in three different versions, +/- 5, 20 and 30 Amperes full scale, each with different scale factors.

The factory calibration is supposed to be accurate to 1.5% of the full scale, but the user could improve that by careful calibration.

8

The ACS712 is AFAIK not rated for 230volt mains.
Most of the breakout boards they come on are definately not designed with grid power in mind.
Leo..

9

Good point, and the terrible spelling errors in the OP lead to zero confidence in the capabilities of the person posting.

10

Thank you so much for both of you for your great help, it's explan a lot of thins that I wanted to ask about it.
About the calibration of ACS758 you said that factory calibrated, so it's preferable to calibrated again or not?