Have you considered using a Ritchie Thrifty King CT unit energy free? Did you know that certain requirements must be met in order to do so? Those requirements are shown below.
One thing that isn't mentioned above, is that it's always a best practice to run electricity to the unit at the time of installation, even if you're not planning on using it initially. Waterer installations are long-term which makes it difficult to plan for how your operation will evolve over the life of the unit. Running electricity at the time of installation will help you should your energy-free requirements change.
To learn more about the Ritchie Thrifty King series units, visit our online store.