Depends what you mean by "off the grid". I've been working on something that has some similarities. Its a mesh network of pest traps in the New Zealand bush. B

Depends what you mean by "off the grid". I've been working on something that has some similarities. Its a mesh network of pest traps in the New Zealand bush. Battery life is very important, so each node sleeps most of the time, then periodically wakes up and communicates with its neighbours. Made more complex by devices not having real time clocks. Once every node in the network is powered down most of the time, I don't think you can consider it a grid.