While only one device can be directly connected to Powerpal at a time (this is a limitation of the Bluetooth Low Energy protocol) all data is synced from the connected device to the cloud. This means it is possible to leave one device at home (such as a tablet) that is connected to your Powerpal and view your energy data on another device (such as your phone) while you are away from home via the cloud.
In order to set this up you can use the following process:
1) Turn Bluetooth off on all currently connected devices
2) Install the Powerpal app on the additional device and pair with your Powerpal
3) Turn Bluetooth back on for your other devices
When more than one device is in Bluetooth range of your Powerpal they will "fight" for the direct connection and the device that loses the fight will fetch its data from the cloud instead.
Note that in order to preserve the battery life on the directly connected device data is batched and sent to the cloud in intervals (every 1 minute if the app it running in the foreground, every 15 minutes if running in the background). So when viewing data from the cloud you may find it is slightly delayed compared to viewing on a directly connected device.
If you are searching for a low cost "hub" to relay the energy data from your Powerpal to the cloud (or to act as an always on display) then why not raid your "old phone drawer" and use the Powerpal app to breathe new life into an old handset? Alternatively we've had reports that the budget Levovo Tab E7 works well, and is available from most major electronics stores.