solar panel ->bettery -> raspberryPi
Step 1: First
Here is Nanshan Shenzhen China, I moved in this apartment months ago. Looked at the scenery outside of the window, I was glad that I ultimately got a sunny window to equip my solar panel...
In addition, I play raspberryPI these days, and had run the Thunder downloader on it, which is a Chinese torrent application, so that I can download stuffs all day with low electricity consumtion.
Step 2: Second
So the capacity of the battery on the leftside is 12V20Ah. I soldered a voltmeter on it.
Then connect the battery and solar power to the solar charege controller whose USB is output. There is a volt-ammeter on the left-bottom of the controller which display parameters from solar panel. So, it showed the voltage iof the solar panel was 12.9V and the current was 0A, without charging.
Next, is a temperature-humidity meter base on arduino and a raspberryPi used for all-day downloading.
Step 3: Third
nothing to say.
Step 4: Fourth
So the PI, gets power from solar-battery system connects to my router with net cable, which afterwards will be changed into wireless network card. The kingston's 32GB usb-disk is used as download disk and Lcd shows current parameters which is implemented though PYTHON.
Step 5: Fifth
Ultimately, I manage the PI with VNC on my computer. After start the PI, I need to configure the Thunder on it so that it can start to downloader. What' more, running the python programe to monitor the cpu temperature and disk space is the second step. Maybe I will add the display of network speed on the LCD which is really essential.It's hard to accept that the so-called downloader shows without speed but just disk space. The code is really simple I don't post it.
Step 6: Cost and Pity
solar panel 350rmb
Actually it's cheep but not very practical.
It's a so-called 90watt panel, but in my case, it's just up to 10watt (13v*0.8A). Also it can just receive sunlight on morning as I placed it vertically and charge about 4hours totally, except that time the ammeter is almost 0A.
It is known the PI cost 0.7A and it works all day long, so
so that means I still need to charge it per several days or turn off the PI if it's in low power.
Disaster...I don't wanner feed it...
Step 7: Update
Modify python code last night as attachment.
TIME N:network speed(KB)
C:cpu usage(%) T:cpu temperature(c) D:disk percent(%)