Well… Curious… My current setup involves a SparkFun battery shield, a WeatherShield and the Photon.
What I want is the system to have enough power to charge and be used during the day. I am charging a 2000mah lipo… When it goes dark, I will enter a battery conservation mode… Where the weather instead of being reported every 10 seconds, will be reported every 3 minutes and in between the wifi radio will be turned off to conserve energy.
Also a DEEP sleep mode will be used if the power for some reason goes bellow 30% charge. Then the deep sleep will be waken every 2 hours. After two hours of deep sleep the system will boot, report status and decide if it will keep in low power mode, deep sleep again or return to normal mode depending on the power.
What I want to determine is how big a solar panel I need to charge the battery, use the photon with WiFi and still contemplate a not so sunny day.
Now the take home value, is I want to learn how to calculate this things .
Any help welcomed!
PS @AndyW I tested the other project with the isolation transformer. Works great! I am still alive! On my first trip to US, Il send it back to you!