Q: What size battery do I need for my system? What size solar panel?
A: Our Power Budget Spreadsheet tool will help you answer these questions. Download a copy from the Downloads section of our web site; look in the Software | Utilities category for it. Or click here: https://www.campbellsci.com/19_1_9999_315
Tip: Think of your battery like a bank account. The solar panel makes deposits to the account and devices in your system make withdrawals. The battery needs to be large enough to accommodate withdrawals during times of minimal deposits such as cloudy winter days.
Learn more: Video Tutorial http://youtu.be/Q6HYf54chIQ Technical Paper https://s.campbellsci.com/documents/us/technical-papers/pow-sup.pdf