Skip navigation

Solar Power Devices

11 Posts authored by: ralphjy Top Member
ralphjy

Solar SPEC - What's Next?

Posted by ralphjy Top Member Sep 14, 2018
I learned a lot putting together the Solar SPEC unit for the Heat Is On Challenge.  I still have some work to do finishing the SPEC unit, but I've also thought of some other solar related projects to work on.   1) VI Curve tracer - this is actually a circuit that I started to build to characterize the reference cell in the SPEC unit, but I ran into some power supply issues and did not complete 2) Sun tracker/locator - this is something that would require an IPcamera with pan/tilt cap ...
We're at the last day of the Heat is On Challenge.   Here is the initial block diagram of my project: I've implemented all of the hardware elements with the exception of only implementing a single temperature sensor and changing the sensor type to an 18B20 probe.  Unfortunately, I haven't deployed the unit to my rooftop solar array yet because I am still testing and tweaking the design.   SPEC Final Hardware:   Finale Video: Not much interesting in watching data accu ...
I've updated the 8266 program to change the temperature sensor from the DHT22 to the 18B20.  It was a straightforward change using the OneWire and DallasTemperature libraries.  Initially nothing was working, but then I realized that I had forgotten to add the pullup resistor on the Data line (not required on the DHT22).  Added a 4.7K resistor to 3.3V and everything started working.   Here is my test plot from ThingSpeak.  I held the temperature probe between my fingers ...
I've completed the build of my SPEC unit. 1) Added terminal block for external temperature sensor 2) Added 18B20 temperature probe 3) Added power switch 4) Added power indicator LED 5) Adapted Solar Cell wiring to micro USB for 8266 Thing power input (spliced the end of a micro USB charging cable) 6) Added cover gasket (temporarily using rope caulk until I can cut a neoprene gasket)     I still need to update the program to use the 18B20 temperature sensor rather than the ...
ralphjy

Solar SPEC - Outdoor Test

Posted by ralphjy Top Member Sep 12, 2018
The day before I went on my vacation to Chicago was bright and sunny and I had an opportunity to test the guts of the project.   LiPo test The night before I ran the unit on the LiPo battery for about 10 hours.  I had fully charged the battery earlier.  With my estimate of 40mA average consumption, I should have consumed about 400mAh or about a third of the battery's capacity.  It took about an hour and 45 minutes to recharge the battery @ 250mA, so I think I'm in the ballp ...
Solar Power Devices Enter Your Electronics & Design Project for Your Chance to Win a Grand Prize for the most inspiring project or a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   I still haven't found my Tmp102 sensor, but I did find a DHT22 (RHT03) temperature and humidity sensor that uses a single-wire interface.   DHT22   I don't think that I'll use this sensor in my final installation, but it will allow me to ...
Solar Power Devices Enter Your Electronics & Design Project for Your Chance to Win a Grand Prize for the most inspiring project or a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   I'm a little behind starting the build of my solar project.  Still having some problems with my 3D printer.  It is starting to show its age (I built the kit 5 years ago).  The heated bed has developed a slight bow, so I'm having issues ...
Solar Power Devices Enter Your Electronics & Design Project for Your Chance to Win a Grand Prize for the most inspiring project or a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Where did the summer go...... Hard to believe that I started to think about this project 3 weeks ago and haven't made much progress yet.  Most of the time has been spent dealing with family issues, but those have to take priority in life.  ...
Solar Power Devices Enter Your Electronics & Design Project for Your Chance to Win a Grand Prize for the most inspiring project or a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   The initial Block Diagram for the SPEC:   First pass at component selection: 1) Solar cells - AOSHIKE Monocrystalline Silicon Solar Cells in Epoxy Package     2V @ 160mA     50mm x 50mm x 2mm    Th ...
Solar Power Devices Enter Your Electronics & Design Project for Your Chance to Win a Grand Prize for the most inspiring project or a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   I thought that as I contemplate my project design that I'd use this blog post to provide a brief description of my solar PV system that I will be monitoring.   System Tradeoffs As I mentioned in the earlier post, I wanted a system that generate ...
ralphjy

Solar SPEC Intro

Posted by ralphjy Top Member Jul 30, 2018
Solar Power Devices Enter Your Electronics & Design Project for Your Chance to Win a Grand Prize for the most inspiring project or a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   This is my initial blog post for the Solar Power Contest.  I thought I would provide some background on my Solar PV installation and the motivation for my design entry.   In December of last year I had solar PV panels installed on the roof ...