Reply To: Purchased wrong solar panel?

If your station is in an open location that gets several hours of direct sunlight every day, then a 2W panel is probably sufficient if you have a cellular modem on your station.  The 2W panel is definitely sufficient if it’s just a Hyrdos21 sensor and no telemetry.  But if your station is under tree canopy or is mostly shaded, the P105 model 5W panel is larger better at generating more current with less light.  You can buy them either directly from Voltaic Systems, or from Adafruit, since they also sell the exact same 5W panel (https://www.adafruit.com/product/5367).