I bought a $75 Dell refurbed laptop off of eBay, a serial(?) datalogger, and the VP2. The laptop had built-in wireless, a built-in battery backup, and simply sits there and chugs along running Cumulus software. I just looked at it and both the laptop and Cumulus has been up and running for 47+ days since it's last interruption...I've had it go as long as 4-5 months without interruption.
One other sensor you might want to add to the ISS is "solar". It's fairly inexpensive and is useful for different reasons...solar energy calculations, evapotranspiration calculations, etc. The UV sensor is a good bit more expensive and actually isn't as useful (you know when the sun is stinging hot!
).
Best wishes on getting things online. A very nice gesture from the donor, too!!!
Ed