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by Etruscian
Thu Jun 12, 2014 12:24 pm
Forum: Automation, sensing and robotics
Topic: Solar panel power output measurement with rpi
Replies: 19
Views: 5028

Re: Solar panel power output measurement with rpi

Okay, so 1% resistors or less it is then. I'm new to using hall sensors, so just to get a simple feel of them, what kind of output can i expect when i place them on a wire carrying 2A? (I know it depends on the type of the sensor, but is there a rough guideline?) The hall sensor already gives 2V5 wh...
by Etruscian
Thu Jun 12, 2014 11:06 am
Forum: Automation, sensing and robotics
Topic: Solar panel power output measurement with rpi
Replies: 19
Views: 5028

Re: Solar panel power output measurement with rpi

Thanks for the informative post. I'm thinking of getting a hall sensor for the current, that would be the safest. For the voltage, wouldn't it suffice to use less accurate resistors and make a mapping which negates the differences? So see what the ADC reads, check with a multimeter (i know they aren...
by Etruscian
Wed Jun 11, 2014 8:51 pm
Forum: Automation, sensing and robotics
Topic: Solar panel power output measurement with rpi
Replies: 19
Views: 5028

Re: Solar panel power output measurement with rpi

DC voltage is 75 to 230V, DC current is max 5A.
The AC side has 230V output with 2.17A max.

That clip would work for the AC side, not for the DC side.
by Etruscian
Wed Jun 11, 2014 4:08 pm
Forum: Automation, sensing and robotics
Topic: Solar panel power output measurement with rpi
Replies: 19
Views: 5028

Re: Solar panel power output measurement with rpi

Both DC current and DC voltage
by Etruscian
Wed Jun 11, 2014 3:37 pm
Forum: Automation, sensing and robotics
Topic: Solar panel power output measurement with rpi
Replies: 19
Views: 5028

Re: Solar panel power output measurement with rpi

My only concern is the insulation around the wire. Would that be a matter of calibration or would it be easier to build a small circuit?
And I still need a solution for the dc voltage (resistor in parallel to bring the voltage down to max 4.5V?)
by Etruscian
Wed Jun 11, 2014 3:00 pm
Forum: Automation, sensing and robotics
Topic: Solar panel power output measurement with rpi
Replies: 19
Views: 5028

Re: Solar panel power output measurement with rpi

@Tage I have access to both the AC and DC side, so i guess the dc side would be a lot safer. I completely forgot about that. Would it be best to measure the dc current with a hall sensor (wires are insulated), or should i put a small circuit in between? @RaTTuS They are self installed in The Netherl...
by Etruscian
Wed Jun 11, 2014 1:14 pm
Forum: Automation, sensing and robotics
Topic: Solar panel power output measurement with rpi
Replies: 19
Views: 5028

Solar panel power output measurement with rpi

I've recently installed solar panels in my house and i'd like to use the raspberry pi to measure the power they produce. I've already got an ADC up and running on the pi (ABElectronics ADCPi v2.1). The program is also written to get a reading every 5 seconds and writing it to a file. Since the volta...
by Etruscian
Fri Feb 15, 2013 5:48 pm
Forum: Debian
Topic: Permission error on mounted usb HDD
Replies: 4
Views: 1500

Re: Permission error on mounted usb HDD

Thank you for your reply.

My fstab right now. Unfortunately, it's not working. I still have the permission error.

Code: Select all

/dev/sdb1 /media/Data ntfs-3g uid=debian-transmission,gid=pi,umask=0000
Did I do something wrong?
by Etruscian
Wed Feb 13, 2013 1:11 pm
Forum: Debian
Topic: Permission error on mounted usb HDD
Replies: 4
Views: 1500

Permission error on mounted usb HDD

While trying to get transmission-daemon to work, I got a permission error in the download folder. After trying almost everything, including starting from scratch, I noted that I couldn't change the permissions of the download folder. It's stuck at Owner: R+W, Group none and Other none. I've tried ch...
by Etruscian
Wed Feb 13, 2013 1:02 pm
Forum: Debian
Topic: Changing permissions folder on mounted usb HDD
Replies: 0
Views: 992

Changing permissions folder on mounted usb HDD

While trying to get transmission-daemon working, I got an error about permissions in the download folder. I have checked everything and it should work. The only thing left is that I can't seem to change to permissions of the group of the owner, or even the permissions of everybody of that folder. I ...

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