Is a VFD Constant Pressure Pump System Worth It?

Cost Comparison Video:    • Cost Comparison: VFD vs Conventional ...  

Just to specify, in this video I will be specifically talking about submersible well pump systems that use variable speed drives to achieve constant pressure in residential systems.

Short answer, Maybe. But most likely Not.
Are VFD’s more efficient? No, not even close. A pump is much less efficient at slower speeds as well as outside the recommended operating range. Most in home applications require less than 2 to 3 gpm and thus would be very inefficient. A conventional pump system runs 1 to 2 minutes generally at its most efficient point to refill the pressure tank. In most low flows using a standard size tank, you can run 20 to 25 gallons between pump cycles.
So what about cost of installation? Generally a little higher than conventional.
Constant water pressure is one of the major reasons that people get excited about VFD’s but this can easily be accomplished by inexpensive mechanical means. Cycle guards, cycle stop valves, even pressure regulating valves can be used. It is worth pointing out that a VFD will provide constant pressure at greater efficiency than a mechanical option.

So after all that what does a VFD really do that’s good?
...
The main benefit is cycle protection at the expense of efficiency.
Provides constant pressure BUT mechanical valves can do this also.
Protects the motor from a variety of situations that could damage it. BUT motor protection devices are inexpensive compared to VFD’s
Potential for longer motor life due to soft start capabilities and the overall higher reliability generally found in 3 phase motors.
Compact.


So when is it a good time to consider a VFD?
Wide range of flow (Small agriculture, small community systems)
Exceptionally deep wells or great distance from electrical source (wire size, but wire doesn’t wear out like electronics) Make sure you consult the manufacturers limits on wire length per drive.
Situations where space for sufficient pressure tanks is not available


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