Hello, Does anyone know which current sensor I can use to monitor a 12v 300w DC power supply? I know I'm not going to be using all 300 watts but it be nice to have that head room just incase. I'm only current uing about 200w.
The only ones I find has a 5am max current sensor.
Joseph
Hi,
AC or DC?
300 / 12 = 25A.max
Tom... 
@TomGeorge I'm sorry I forgot to add that. I changed it in the original post. It is DC power.
Hello josephchrzempiec
Take a view to get some ideas:
Hey Joseph. With a little searching I found this IC: ACS758LCB-100B-PFF-T. It is capable of reading up to 50 amps. I do not know its voltage maximum so it might not work for your application. Heres its data sheet: https://www.allegromicro.com/~/media/Files/Datasheets/ACS758-Datasheet.ashx
You can also use something like the SCT-013-000. You can clip this around the wire that is caring the current and then read the output. Here is the product on amazon. https://www.amazon.com/SCT-013-000-Non-invasive-Current-Transformer-Sensor/dp/B0789JYRH8
Note. I am farely certain you will only be able to use this if you are using AC current.
Here is a link to a forum with the SCT-013-000 being used with Arduino that may answer more questions than I could probably answer.https://forum.arduino.cc/t/current-sensor-sct-013-000-bidirectional/693018/2
Hope that helps. If non of these are what you are looking for let me know a couple of other parameters.
Cheers
@paulpaulson I had a look at the INA219. I only saw it the max is at 3 to 5 amps?
@dragonboss_18 I never heard of the ACS758 before. I just looked at it and it seems that will do it. The sensor I need to be on a pcb. not external like the clsmp one.
But I think the ACS758 one just might do the trick. Thank you very much.
Use a shunt simply.
@paulpaulson interesting. Not sure maybe.
Of course I am glad I could help. I would do some more research than I did to make sure it can handle up to 300 watts.
@dragonboss_18 Honestly looking at the datasheet. That will do the trick again Thank you.
Awesome I am glad
I don't have problem with shunts. The thing is I can't put it on a pcb. I'm trying to monitor a gpu. So I'm working on my own voltage/current monitoring.
How many 12volt power wires to this GPU (3-6?).
You might have to use one sensor per phase.
An INA260 (Adafruit) could be another option (15A continuous, 15-bit resolution).
Leo..
@Wawa Not for a GPU. It's for a server motherboard that only has 12v input. Take close to 180 watts. I'm saying 200 Watts for a little over heard. The power supply is a 12v 300w. which is more then enough.
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