Dear customer,
Stalker and Xbee Carrier is different board, I think Stalker is more powerful.
But XBee Carrier is more portable.
So how you use with them depend on you.
Anyway I’m not mean that you should throw away.
But I still not understand what you need with wireless and the temp/hum sensor.
If you just want to get some value from sensor then send back to you.
You need to consider wireless just as the cell phone you also can’t talk too much time with battery.
It is a lot of way can save your power.
1.Add a bigger solar panel or more until can support them.
2.Control your wireless bee via code, turn off WIFI when you no need to use it.
3.Or you can find a movable power supply to it.
But sorry we not support software that you should solve by yourself.
Best regards,
Yuri