I have my Pi installed with Wheezy, Tesco bluetooth dongle and running from Kindle PSU.
Installed sma-bluetooth software from http://code.google.com/p/sma-bluetooth/
The crontab job then wakes up every 5 minutes to talk to the SMA Inverter to grab the solar panel output data and post to pvoutput. This works fine for a while and then once or twice a day the bluetooth gives up and I have to reboot the whole Pi to clear it. BTW running /etc/init.d/bluetooth restart does not clear the issue.
Is anyone else out there running a Pi to gather stats from SMA Inverters via bluetooth and finding bluetooth unstable after running for a while?