Each channel is the data from one transmitter.
The Energomonitor Gateway can post thirty channels of data to http://app.energomonitor.cz
As standard, the Energomonitor Gateway will post one channel of data for free forever to http://app.energomonitor.cz.
You can purchase a data pack to add more channels direct from Energomonitor for EUR19.00 for a year.
At the end of the year, you can renew your data pack. Should you chose not to, the Energomonitor Gateway will revert to posting one channel of data.