It will massively depend on what the Raspberry Pi is doing, and if you have things plugged in to the USB/GPIO ports.
When the Pi is idle, not doing anything, it'll consume roughly 1.9W but when under heavy load it can increase to 5W. As the solar panel won't be producing power during the night, a battery will need to be large enough to provide power during night, then the solar panel will need to provide enough power to the battery to charge it, whilst providing enough power to run the Pi as well.
This solar panel is designed for use with the PiJuice power platform for your Raspberry Pi. It has a regulated 5 volt USB output attached to the internal smart-power chip so it also works with your smartphone, tablet, laptop, camera, audio players and more.
The PiJuice 6 Watt Solar panel is the ideal way to charge and/or power your PiJuice HAT and Raspberry Pi for free when you’re in a sunny location. By using a solar panel and PiJuice, containing our revolutionary PiAnywhere technology, you can truly take your Raspberry Pi off the grid!
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